Patent Application
20240199771
The invention belongs to the technical field of polyolefin materials, and more particularly, relates to a branched olefin polymer, a preparation method therefor and use thereof.
Compared with other resin materials, olefin resins have excellent environmental coordination, and are used as a mainly promotional material in the automobile industry in developed countries. Commercialized polyethylene catalysts include Ziegler-Natta type catalysts (DE Patent 889229 (1953); IT Patent 545332 (1956); IT Patent 536899 (1955); Chem. Rev., 2000, 100, 1169 and related references therein), Phillips-type catalysts (Belg. Pat. 530617 (1955); Chem. Rev. 1996, 96, 3327), metallocene-type catalysts (W. Kaminsky, Metalorganic Catalysts for Synthesis and Polymerization, Berlin: Springer, 1999), and late transition metal complex-type efficient catalysts for ethylene oligomerization and polymerization rapidly developed in recent years. For example, in 1995, Brookhart et al. reported a class of α-diimine Ni(II) complexes, which can catalyze ethylene polymerization with high activity.
CN11148641 discloses a polyolefin elastomer having excellent properties, which polyolefin elastomer is prepared by catalyzing, by using a single-active-site catalyst, the copolymerization of ethylene and a long-chain α-olefin monomer, which is mainly α-hexene, α-octene or the like. However, the selective production of long-chain α-olefins is technically difficult, and the process for separating α-olefins from internal olefins is relatively long. The emergence of each new generation of catalysts has brought tremendous development to the olefin polymerization field, but the kinds of olefins that can be polymerized efficiently may be limited. All olefins whose double bond is not at the ends of the carbon chain are called internal olefins. Due to the large steric hindrance of internal olefins, it is not easy for cationic metal centers with bulky ligands to insert into the double bond of the internal olefins. Therefore, almost all internal olefins and derivatives thereof are non-active or very lowly active to homogeneous polymerization so that many internal olefins have not been used as polymerization monomers yet. Only a few literatures have hitherto reported the polymerization performance of internal olefins (Polymer 2017, 127, 88; Organometallics 2018, 37, 1358-1367), and the polymerization performance of an internal olefin together with a terminal olefin as polymerization monomers has rarely been reported. Furthermore, the internal olefins have generally low copolymerization activities. If the copolymerization of these internal olefins and terminal olefins can be catalyzed to obtain polymers, not only the process of separating internal olefins from terminal olefins can be omitted, but also the new polymer materials obtained may exhibit special properties different from those of the currently used polyolefin materials.
Bimodal polyethylene resins can be prepared through different methods. Bimodal polyethylene products can be produced by physically blending different unimodal polyolefin products produced separately. However, the product homogeneity of the bimodal product prepared by physical blending and the inclusion of a high content of gel after mixing are issues difficult to solve. In a method of preparing bimodal polyethylene by sequential polymerization in multiple separate reactors in series, if the molecular weights as well as densities of individual polyethylene components are too significantly different from each other, then desired uniform mixing cannot be achieved, and the performance advantages of bimodal polyethylene products cannot fully exhibit. The preparation of bimodal polyethylene resin in a single reactor by a double-site metal catalyst has successful industrial practice, but in such a process, the screening and preparation of catalysts are technically difficult.
Hence, there is still an unmet need in the art to branched olefin polymers and methods for the preparation of the same.
In view of the above, the inventors have prepared a branched bimodal olefin polymer by a specific method after extensive and in-depth researches. It has now been found that catalyst systems comprising specific complexes can catalyze the copolymerization of at least one internal olefin and optionally ethylene, propylene and/or higher terminal olefins at high activity to produce branched bimodal olefin polymers. Compared to the commercial bimodal polyethylene resin preparation method, the method of the present invention does not need to separate internal olefins from mixed olefins, does not need to use multi-tank series operation, and does not need to use multi-site catalyst in the preparation so that it can greatly simplify the process and reduce production costs, and product performance is better.
In a first aspect, the present invention provides a branched olefin polymer obtained by polymerizing at least one C4-C20 internal olefin monomer and optionally at least one C2-C20 terminal olefin monomer, the branched olefin polymer having the following characteristics:
In a second aspect, the present invention provides a method for preparing the above-described branched olefin polymer, in which the branched olefin polymer is obtained by catalytic polymerization using a catalyst system comprising a metal complex having a structure represented by formula I:
wherein, R1 and R2 are each independently a C1-C30 hydrocarbyl with or without a substituent; R3 and R4 are each independently selected from the group consisting of hydrogen, halogen, hydroxy, and C1-C20 hydrocarbyl with or without a substituent, and adjacent R3 and R4 groups are optionally joined to form a ring or ring system; each R11 is independently a C1-C20 hydrocarbyl with or without a substituent; each Y is independently a Group VIA non-metal atom; each M is independently a Group VIII metal; and each X is independently selected from the group consisting of halogen, C1-C10 hydrocarbyl with or without a substituent and C1-C10 hydrocarbyloxy with or without a substituent.
In a third aspect, the present invention provides use of the above-described branched olefin polymer or the branched olefin polymer obtained by the above-described preparation method, including use:
In a further aspect, the present invention provides a branched olefin polymer having units derived from at least one C4-C20 internal olefin monomer and optionally units derived from at least one C2-C20 terminal olefin monomer, the branched olefin polymer having the following characteristics:
In a still further aspect, the present invention provides a polymer composition comprising the branched olefin polymer of the present disclosure, wherein the branched olefin polymer is used as a processing aid or plasticizer for resins, and/or the polymer composition can be used as a hot-melt adhesive.
Compared to the prior art, the main advantages of the present invention include: in the present invention, narrow-distribution, bimodal polyolefin is directly prepared in a single reactor at high activity by a single catalyst so that the polymerization process can be greatly simplified, and the resultant branched olefin polymer has a certain degree of branching and a bimodal molecular weight distribution, can be used as a processing aid or plasticizer, and can also be used directly as a plastomer material.
Other features and advantages of the present invention will be described in detail in the following detailed description.
Specific embodiments of the present invention will be described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.
According to the first aspect, the present invention provides a branched olefin polymer obtained by polymerizing at least one C4-C20 internal olefin monomer and optionally at least one C2-C20 terminal olefin monomer, the branched olefin polymer having the following characteristics:
Preferably, the branched olefin polymer has the following characteristics: a number of methyl groups per 1000 methylene groups of from 20 to 100, and a molecular weight of from 20,000 to 300,000 g/mol.
Preferably, the branched olefin polymer contains 20 to 100 alkyl branches per 1000 methylene groups, and the branched olefin polymer contains 2 to 10 ethyl branches, 1 to 10 propyl branches, 1 to 10 butyl branches, 1 to 10 pentyl branches, and 1 to 20 hexyl or longer branches, relative to 50 methyl branches.
According to the second aspect, the present invention provides a method for preparing the above-described branched olefin polymer, in which the branched olefin polymer is obtained by catalytic polymerization using a catalyst system comprising a metal complex having a structure represented by Formula I:
wherein, R1 and R2 are each independently a C1-C30 hydrocarbyl with or without a substituent; R3 and R4 are each independently selected from the group consisting of hydrogen, halogen, hydroxy, and C1-C20 hydrocarbyl with or without a substituent, and adjacent R3 and R4 groups are optionally joined to form a ring or ring system; each R11 is independently a C1-C20 hydrocarbyl with or without a substituent; each Y is independently a Group VIA non-metal atom; each M is independently a Group VIII metal; and each X is independently selected from the group consisting of halogen, C1-C10 hydrocarbyl with or without a substituent and C1-C10 hydrocarbyloxy with or without a substituent.
Preferably, in Formula I, R1 and R2 are independently selected from the group consisting of C1-C20 alkyl with or without a substituent and C6-C20 aryl with or without a substituent.
Further preferably, in Formula I, R1 and/or R2 are/is a group represented by formula P:
wherein, R1-R5 are the same or different, and are each independently selected from the group consisting of hydrogen, halogen, hydroxy, C1-C20 linear alkyl with or without a substituent, C3-C20 branched alkyl with or without a substituent, C2-C20 alkenyl with or without a substituent, C2-C20 alkynyl with or without a substituent, C3-C20 cycloalkyl with or without a substituent, C1-C20 linear alkoxy with or without a substituent, C3-C20 branched alkoxy with or without a substituent, C2-C20 alkenoxy with or without a substituent, C2-C20 alkynoxy with or without a substituent, C3-C20 cyclic alkoxy with or without a substituent, C6-C20 aryl with or without a substituent, C7-C20 aralkyl with or without a substituent, and C7-C20 alkaryl with or without a substituent, and R1-R5 are optionally joined to form a ring.
Preferably, in Formula P, R1 to R5 are the same or different, and are each independently selected from the group consisting of hydrogen, halogen, hydroxy, C1-C10 linear alkyl with or without a substituent, C3-C10 branched alkyl with or without a substituent, C2-C10 alkenyl with or without a substituent, C2-C10 alkynyl with or without a substituent, C3-C10 cycloalkyl with or without a substituent, C1-C10 linear alkoxy with or without a substituent, C3-C10 branched alkoxy with or without a substituent, C2-C10 alkenoxy with or without a substituent, C2-C10 alkynoxy with or without a substituent, C3-C10 cyclic alkoxy with or without a substituent, C6-C15 aryl with or without a substituent, C7-C15 aralkyl with or without a substituent, and C7-C15 alkaryl with or without a substituent.
Preferably, in Formula I, each M is selected from nickel and palladium.
Preferably, in Formula I, each Y is selected from O and S.
Preferably, in Formula I, each X is selected from the group consisting of halogen, C1-C10 alkyl with or without a substituent and C1-C10 alkoxy with or without a substituent, preferably from the group consisting of halogen, C1-C6 alkyl with or without a substituent and C1-C6 alkoxy with or without a substituent.
Preferably, in Formula I, each R11 is a C1-C20 alkyl with or without a substituent, preferably a C1-C10 alkyl with or without a substituent, and more preferably a C1-C6 alkyl with or without a substituent.
Preferably, in Formula I, R3 and R4 are each independently selected from the group consisting of hydrogen, halogen, hydroxy, C1-C20 alkyl with or without a substituent, C2-C20 alkenyl with or without a substituent, C2-C20 alkynyl with or without a substituent, C1-C20 alkoxy with or without a substituent, C2-C20 alkenoxy with or without a substituent, C2-C20 alkynoxy with or without a substituent, C6-C20 aryl with or without a substituent, C6-C20 aryloxy with or without a substituent, C7-C20 aralkyl with or without a substituent, C7-C20 aralkoxy with or without a substituent, C7-C20 alkaryl with or without a substituent and C7-C20 alkaryloxy with or without a substituent. More preferably, R3 and R4 are each independently selected from the group consisting of hydrogen, halogen, hydroxy, C1-C10 linear alkyl with or without a substituent, C1-C10 branched alkyl with or without a substituent, C2-C10 alkenyl with or without a substituent, C2-C10 alkynyl with or without a substituent, C3-C10 cycloalkyl with or without a substituent, C1-C10 linear alkoxy with or without a substituent, C1-C10 branched alkoxy with or without a substituent, C2-C10 alkenoxy with or without a substituent, C2-C10 alkynoxy with or without a substituent, C3-C10 cycloalkoxy with or without a substituent, C6-C15 aryl with or without a substituent, C6-C15 aryloxy with or without a substituent, C7-C15 aralkyl with or without a substituent, C7-C15 aralkoxy with or without a substituent, C7-C15 alkaryl with or without a substituent and C7-C15 alkaryloxy with or without a substituent. More preferably, R3 and R4 are each independently selected from the group consisting of hydrogen, C1-C10 alkyl, halogenated C1-C10 alkyl, C1-C10 alkoxy, halogenated C1-C10 alkoxy and halogen, and more preferably from the group consisting of hydrogen, C1-C6 alkyl, halogenated C1-C6 alkyl, C1-C6 alkoxy, halogenated C1-C6 alkoxy and halogen.
Preferably, for the formula I, said substituent is selected from the group consisting of halogen, hydroxy, C1-C10 alkyl, halogenated C1-C10 alkyl, C1-C10 alkoxy and halogenated C1-C10 alkoxy, preferably from the group consisting of halogen, hydroxy, C1-C6 alkyl, halogenated C1-C6 alkyl, C1-C6 alkoxy and halogenated C1-C6 alkoxy. Preferably, the C1-C6 alkyl is selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, n-pentyl, isopentyl, n-hexyl, isohexyl and 3,3-dimethylbutyl. Preferably, the C1-C6 alkoxy is selected from the group consisting of methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-butoxy, n-pentoxy, iso-pentoxy, n-hexoxy, iso-hexoxy and 3,3-dimethylbutoxy. Preferably, the halogen is selected from the group consisting of fluorine, chlorine, bromine and iodine.
According to an embodiment of the invention, the metal complex has a structure represented by formula II:
wherein, R1-R5 are each independently selected from the group consisting of hydrogen, halogen, hydroxy, C1-C10 linear alkyl with or without a substituent, C3-C10 branched alkyl with or without a substituent, C3-C10 cycloalkyl with or without a substituent, C1-C10 linear alkoxy with or without a substituent, C3-C10 branched alkoxy with or without a substituent, C3-C10 cycloalkoxy with or without a substituent, C6-C15 aryl with or without a substituent, C7-C15 aralkyl with or without a substituent and C7-C15 alkaryl with or without a substituent;
According to another embodiment of the present invention, the metal complex has a structure represented by formula III:
wherein, R5-R7 are each independently selected from the group consisting of hydrogen, halogen, hydroxy, and C1-C20 hydrocarbyl with or without a substituent, and R5-R7 are optionally joined to form a ring or ring system; R1, R2, R11, Y, M and X are as defined above for Formula I.
Preferably, the metal complex has a structure represented by formula IV:
wherein, R1-R5 are each independently selected from the group consisting of hydrogen, halogen, C1-C6 alkyl with or without a substituent, and C1-C6 alkoxy with or without a substituent; R8-R10 and R12-R14 are each independently selected from the group consisting of hydrogen, halogen, C1-C6 alkyl, and C1-C6 alkoxy; each M is nickel; each Y is O; each X is independently a halogen; and each R11 is independently a C1-C6 alkyl with or without a substituent.
Further preferably, the metal complex is one or more selected from the group consisting of:
According to another embodiment of the present invention, the metal complex has a structure represented by formula V:
wherein, R15 to R18 are each independently selected from the group consisting of hydrogen, halogen, hydroxy, and C1-C20 hydrocarbyl with or without a substituent, and R15 to R18 are optionally joined to form a ring or ring system; and R1, R2, R11, Y, M, X are as defined above for Formula I.
Preferably, the metal complex has a structure represented by formula VI:
wherein, R1 to R11 are each independently selected from the group consisting of hydrogen, halogen, hydroxy, C1-C10 linear alkyl with or without a substituent, C3-C10 branched alkyl with or without a substituent, C3-C10 cycloalkyl with or without a substituent, C1-C10 linear alkoxy with or without a substituent, C3-C10 branched alkoxy with or without a substituent, C3-C10 cycloalkoxy with or without a substituent, C6-C15 aryl with or without a substituent, C7-C15 aralkyl with or without a substituent, and C7-C15 alkaryl with or without a substituent; and R11, Y, M, X are as defined above for Formula I.
Further preferably, the metal complex is one or more selected from the group consisting of:
According to the invention, the metal complex can be prepared by a method comprising: reacting a diimine compound represented by Formula VII with MXn and R11YH to form the diimine-metal complex represented by Formula I,
The reaction in the above method is carried out in an organic solvent, and the organic solvent is preferably a halogenated alkane, and more preferably the organic solvent is one or more selected from dichloromethane, trichloromethane and 1,2-dichloroethane. The reaction is carried out at a temperature of 15 to 40° C.
In the present invention, examples of the MXn include nickel halides, such as nickel bromide and nickel chloride, 1,2-dimethoxyethane nickel halides, such as 1,2-dimethoxyethane nickel bromide and 1,2-dimethoxyethane nickel chloride.
According to the invention, the catalyst system further comprises a cocatalyst, which is a reagent that can promote the catalysis olefin polymerization, and which can be selected from the group consisting of organoaluminum compounds and/or organoboron compounds.
In the invention, the organoaluminum compounds are at least one selected from the group consisting of alkylaluminoxanes, alkylaluminums and alkyl aluminum halides. The alkylaluminums and the alkyl aluminum halides may be represented by a general formula of AlRnX13-n, in which R is H, a C1-C20 hydrocarbyl or a C1-C20 hydrocarbyloxy, preferably a C1-C20 alkyl, a C1-C20 alkoxy, a C7-C20 aralkyl or a C6-C20 aryl; X1 is a halogen, preferably chlorine or bromine; and 0<n≤3.
According to the invention, specific examples of the organoaluminum compound include, but are not limited to, trimethylaluminum, triethylaluminum, triisobutylaluminum, tri-n-hexylaluminum, trioctylaluminum, diethyl aluminum hydride, diisobutyl aluminum hydride, diethyl aluminum chloride, diisobutyl aluminum chloride, ethyl aluminum sesquichloride, methyl aluminum sesquichloride, ethyl aluminum dichloride, methylaluminoxane (MAO), and modified methyl aluminoxane (MMAO).
According to the invention, the organoboron compound is selected from the group consisting of aromatic hydrocarbyl boron compounds and/or borates. The aromatic hydrocarbyl boron compounds are preferably substituted or unsubstituted phenyl boron, and more preferably tris(pentafluorophenyl)boron. The borates are preferably N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate and/or triphenylcarbonium tetrakis(pentafluorophenyl)borate.
According to the invention, when the cocatalyst is an organoaluminum compound, the molar ratio of aluminum in the co-catalyst to M in the main catalyst is (10-107):1, for example, 10:1, 20:1, 50:1, 100:1, 200:1, 300:1, 500:1, 700:1, 800:1, 1,000:1, 2,000:1, 3,000:1, 5,000:1, 10,000:1, 100,000:1, 1,000,000:1, 10,000,000:1, and any value therebetween, preferably (10-100,000):1, and more preferably (100-10,000):1.
When the cocatalyst is an organoboron compound and an organoaluminum compound, the molar ratio of boron in the cocatalyst to M in the main catalyst is (0.1-1,000):1, for example, 0.1:1, 0.2:1, 0.5:1, 1:1, 2:1, 3:1, 5:1, 8:1, 10:1, 20:1, 50:1, 100:1, 200:1, 300:1, 500:1, 700:1, 800:1, 1,000:1, and any value therebetween, preferably (0.1-500):1, and the molar ratio of the organoaluminum to M in the main catalyst is (10-105):1, for example, 10:1, 20:1, 50:1, 100:1, 200:1, 300:1, 400:1, 500:1, 600:1, 700:1, 800:1, 1,000:1, 2,000:1, 3,000:1, 5,000:1, 10,000:1, 100,000:1, and any value therebetween, preferably (10-5,000):1, and more preferably (10-1,000):1.
The symbols used in different general formulae or structural formulae in the present application, such as R1, R2, R3, R4, R5, R1, R2, R11, R12, X, M, Y, etc., are used in the same meaning in the individual general formulae or structural formulae unless otherwise specified.
In the invention, C1-C20 alkyl refers to C1-C20 linear alkyl or C3-C20 branched alkyl, including but not limited to: methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, tert-amyl, neopentyl, n-hexyl, n-heptyl, n-octyl and n-decyl.
Examples of C3-C20 cycloalkyl include, but are not limited to, cyclopropyl, cyclopentyl, cyclohexyl, 4-methylcyclohexyl, 4-ethylcyclohexyl, 4-n-propylcyclohexyl, and 4-n-butylcyclohexyl.
Examples of C6-C20 aryl include, but are not limited to, phenyl, 4-methylphenyl, 4-ethylphenyl, dimethylphenyl, and vinylphenyl.
C2-C20 alkenyl refers to C2-C20 linear alkenyl or C3-C20 branched alkenyl, including but not limited to, vinyl, allyl, and butenyl.
Examples of C7-C20 aralkyl include, but are not limited to, phenylmethyl, phenylethyl, phenyl-n-propyl, phenylisopropyl, phenyl-n-butyl, and phenyl-tert-butyl.
Examples of C7-C20 alkaryl include, but are not limited to, tolyl, ethylphenyl, n-propylphenyl, isopropylphenyl, n-butylphenyl, and t-butylphenyl.
In the invention, when the olefin is polymerized, the olefin, the diamine-metal complex and the cocatalyst can react with each other in an inert solvent, or a bulk polymerization can be carried out directly in the olefin. The reaction time may be from 0.5 to 72 hours, and the reaction temperature may be from −50 to 200° C., preferably from 30 to 100° C.
The inert solvent can be an alkane, an aromatic hydrocarbon or a halogenated hydrocarbon. The alkanes are preferably C5-C20 saturated hydrocarbons, such as hexane and heptane; the halogenated hydrocarbons can be dichloromethane, 1,2-dichloroethane, and 1,1,2,2-tetrachloroethane; and the aromatic hydrocarbons can be toluene and xylene.
As used herein, the term “internal olefin” refers to an olefin whose double bond is not at a terminal position. The internal olefin feedstock useful in the present invention may be a mixture of isomers having the same carbon number or a single internal olefin. For example, the internal butene can be cis-2-C4 olefin or trans-2-C4 olefin, or a mixture of cis-2-C4 olefin and trans-2-C4 olefin. The internal olefin feedstock useful in the present invention may also be a mixture of internal olefins having different carbon numbers.
As used herein, the term “terminal olefin” (also referred to as alpha-olefin) refers to an olefin whose double bond is at a terminal position, such as 1-butene.
According to the third aspect, the present invention provides use of the above-described branched olefin polymer or the branched olefin polymer obtained by the above-described preparation method, including use:
A notable feature of the branched olefin polymer of the present invention is that the molecular weight distribution of the bimodal polymer is narrow, ranging from 3.5 to 6.0, but it can be seen from the GPC trace that the obtained polymer is a bimodal branched polyolefin. This feature makes the branched olefin polymer of the present invention microscopically different from ordinary linear polymers, and more suitable for use as a processing aid for resins, as a plasticizer or in a hot-melt adhesive, or directly as a plastomer materials.
The present invention will be further illustrated below with reference to examples, but the scope of the present invention is not limited to these examples.
The analytical characterization instruments used in the following examples and comparative examples are as follows:
Preparation of Complex Ni1 (represented by Formula VI, wherein R1, R3 are ethyl; R2, R4, R5, R6, R7, R10 are hydrogen; R8, R9, R11 are methyl; R11 is ethyl; M is nickel; Y is O; and X is Br):
Preparation of Ligand L1 (represented by Formula O, wherein R1, R3 are ethyl, R2, R4, R5, R6, R7, R10 are hydrogen, and R8, R9, R11 are methyl): Under nitrogen atmosphere, 2,6-diethylaniline (2.0 ml, 12 mmol) was dissolved in 20 ml of toluene, and 12 ml of trimethylaluminum (1.0M, 12 mmol) was added dropwise at normal temperature. The reaction was refluxed for 2 hours, and the system was then cooled to room temperature. Camphorquinone (0.831 g, 5 mmol) was added thereto, and the system was refluxed for 6 h. The reaction product was neutralized with aqueous sodium hydroxide solution, extracted with dichloromethane, dried over anhydrous magnesium sulfate, and then subjected to a column chromatography to afford yellow ligand L1. Yield: 69.2%. 1H-NMR (CDCl3): δ6.94-6.92 (m, 6H, CAr—CH3), 2.56-2.51 (m, 4H, CAr—CH3), 2.36-2.31 (m, 4H, CAr—CH3), 1.82-1.78 (m, 4H, CH2), 1.54 (m, 1H), 1.24-1.18 (m, 12H), 1.09 (s, 3H, CH3), 0.94 (m, 6H, CH3).
A solution of 0.277 g (0.9 mmol) of (DME)NiBr2 (wherein DME represents ethylene glycol dimethyl ether) in ethanol (10 mL) was added slowly dropwise to a solution of 0.258 g (0.6 mmol) of ligand L1 in dichloromethane (10 mL). The color of the solution immediately changed to deep red, and a large quantity of precipitants was formed. The reaction was stirred at room temperature for 6 h, and then anhydrous diethyl ether was added to perform precipitation. A filtration was performed to afford a filter cake, and the filter cake was washed with anhydrous diethyl ether and dried in vacuum to afford Ni1 as brownish-red powdery solids. Yield: 78.2%. Elemental analysis (calculated for C64H90Br6N4Ni3O2): C, 47.96; H, 5.66; N, 3.50; experimental value (%): C, 47.48; H, 6.00; N, 3.26.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 400 mL of hexane and 100 mL of 2-octene were charged into the polymerization autoclave, and then 5.0 mL of methylaluminoxane (MAO) (1.53 mol/1 solution in toluene) was added, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni1. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 440 mL of hexane and 80 mL of 2-octene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni1. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 380 mL of hexane and 120 mL of 2-octene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni1. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 320 mL of hexane, 130 mL of 2-octene and 130 mL of 1-hexadecene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni1. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below. It was found that the polymer contained 64.8 methyl branches, 4.4 ethyl branches, 2.6 propyl branches, 2.2 butyl branches, 1.6 pentyl branches, 13.8 branches having 6 or more carbon atoms, per 1000 carbon atoms.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 500 mL of hexane was charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 μmol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni1. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 320 mL of hexane and 180 mL of 1-octene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni1. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
Preparation of Complex Ni2 (represented by Formula VI, wherein R1, R3 are fluorine; R2, R4, R5, R6, R7, R10 are hydrogen; R8, R9, R11 are methyl; R11 is ethyl; M is nickel; Y is O; and X is Br): Preparation of Ligand L2 (represented by Formula O, wherein R1, R3 are fluorine; R2, R4, R5, R6, R7, R10 are hydrogen; and R8, R9, R11 are methyl): Under nitrogen atmosphere, 2,6-difluoro-aniline (1.3 ml, 12 mmol) was dissolved in 20 ml of toluene, and 12 ml of trimethylaluminum (1.0M, 12 mmol) was added dropwise at normal temperature. The reaction was refluxed for 2 hours, and the system was then cooled to room temperature. Camphorquinone (0.831 g, 5 mmol) was added thereto, and the system was refluxed for 6 h. The reaction product was neutralized with aqueous sodium hydroxide solution, extracted with dichloromethane, and dried, and then subjected to a column chromatography to afford yellow ligand L2. Yield: 50.3%. 1HNMR (CDCl3): δ [with an isomer ratio of 1.2:1]: major isomer: 6.83-6.74 (m, 6H, CAr—CH3), 1.93-1.90 (m, 4H, CH2), 1.55 (m, 1Hl), 1.26 (s, 3H, CH3), 1.06 (s, 6H, CH3); minor isomer: 6.91-6.84 (m, 6H, CAr—CH3), 1.96-1.94 (m, 4H, CH2), 1.55 (m, 1H), 1.26 (s, 3H, CH3), 1.02 (s, 6H, CH3).
A solution of 0.277 g (0.9 mmol) of (DME)NiBr2 in ethanol (10 mL) was added slowly dropwise to a solution of 0.233 g (0.6 mmol) of ligand L2 in dichloromethane (10 mL). The color of the solution immediately changed to deep red, and a large quantity of precipitants was formed. The reaction was stirred at room temperature for 6 h, and then anhydrous diethyl ether was added to perform precipitation. A filtration was performed to afford a filter cake, and the filter cake was washed with anhydrous diethyl ether and dried in vacuum to afford Ni2 as brownish-red powdery solids. Yield: 74.3%. Elemental analysis (calculated for C48H50Br6F8N4Ni3O2): C, 37.87; H, 3.31; N, 3.68; experimental value (%): C, 37.78; H, 3.62; N, 3.28.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 400 mL of hexane and 100 mL of 2-octene were charged into the polymerization autoclave, and then 5.0 mL of methylaluminoxane (MAO) (1.53 mol/1 solution in toluene) was added, followed by the addition of 3.8 mg (2.5 μmol) of complex Ni2. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
Preparation of complex Ni3 (represented by Formula VI, wherein R1, R2, R3 are methyl; R4, R5, R6, R7, R10 are hydrogen; R8, R9, R11 are methyl; R11 is ethyl; M is nickel; Y is O; and X is Br): Preparation of ligand L3 (represented by Formula O, wherein R1, R2, R3 are methyl; R4, R5, R6, R7, R10 are hydrogen; and R8, R9, R11 are methyl): Under nitrogen atmosphere, 2,4,6-trimethyl-aniline (1.7 ml, 12 mmol) was dissolved in 20 ml of toluene, and 12 ml of trimethylaluminum (1.0M, 12 mmol) was added dropwise at normal temperature. The reaction was refluxed for 2 hours, and the system was then cooled to room temperature. Camphorquinone (0.831 g, 5 mmol) was added thereto, and the system was refluxed for 6 h. The reaction product was neutralized with aqueous sodium hydroxide solution, extracted with dichloromethane, and dried, and then subjected to a column chromatography to afford yellow ligand L3. Yield: 62.5%. 1HNMR (300 MHz, CDCl3), δ (ppm) [with an isomer ratio of 1.2:1]: major isomer: 6.72 (s, 4H, Ar—H), 2.26-2.13 (m, 12H, CAr—CH3), 1.87 (s, 6H, CAr—CH3), 1.79 (m, 4H, CH2), 1.42 (m, 1H), 1.26 (s, 3H, CH3), 1.07 (s, 6H, CH3); minor isomer: 6.67 (s, 4H, Ar—H), 2.09-2.01 (m, 12H, CAr—CH3), 1.85 (s, 6H, CAr—CH3), 1.79 (m, 4H, CH2), 1.40 (m, 1H), 1.26 (s, 3H, CH3), 0.94 (s, 6H, CH3).
A solution of 0.277 g (0.9 mmol) of (DME)NiBr2 in ethanol (10 mL) was added slowly dropwise to a solution of 0.240 g (0.6 mmol) of ligand L3 in dichloromethane (10 mL). The color of the solution immediately changed to deep red, and a large quantity of precipitants was formed. The reaction was stirred at room temperature for 6 h, and then anhydrous diethyl ether was added to perform precipitation. A filtration was performed to afford a filter cake, and the filter cake was washed with anhydrous diethyl ether and dried in vacuum to afford Ni3 as brownish-red powdery solids. Yield: 78.6%. Elemental analysis (calculated for C60H82Br6N4Ni3O2): C, 46.59; H, 5.34; N, 3.62; experimental value (%): C, 46.24; H, 5.67; N, 3.21.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 440 mL of hexane and 60 mL of 2-octene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 mol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 3.9 mg (2.5 μmol) of complex Ni3. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below. It was found that the obtained polymer had a glass transition temperature of −65.8° C. It was known from the 13CNMR spectrum of the obtained polymer that the polymer contained 60 methyl branches, 4.8 ethyl branches, 3.0 propyl branches, 2.9 butyl branches, 3.5 pentyl branches, 7.9 branches having 6 or more carbon atoms, per 1000 carbon atoms.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 440 mL of hexane, 30 mL of 2-octene and 30 mL of 1-hexadecene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 3.9 mg (2.5 μmol) of complex Ni3. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 380 mL of hexane, 60 mL of 2-octene and 60 mL of 1-hexadecene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 3.9 mg (2.5 μmol) of complex Ni3. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below. It was found that the polymer contained 54.3 methyl branches, 5.4 ethyl branches, 3.8 propyl branches, 3.5 butyl branches, 3.2 pentyl branches, 11.2 branches having 6 or more carbon atoms, per 1000 carbon atoms.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 320 mL of hexane, 90 mL of 2-octene and 90 mL of 1-hexadecene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 3.9 mg (2.5 μmol) of complex Ni3. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 320 mL of hexane, 90 mL of 2-octene and 90 mL of 1-hexadecene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 3.9 mg (2.5 μmol) of complex Ni3. The reaction was vigorously stirred at 80° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below. It was found that the obtained polymer had a melting point of 0.28° C. and a glass transition temperature of −55.63° C.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 500 mL of hexane was charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 μmol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 3.9 mg (2.5 μmol) of complex Ni3. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 320 mL of hexane and 180 mL of 1-octene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 3.9 mg (2.5 μmol) of complex Ni3. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
Preparation of complex Ni4 (represented by Formula VI, wherein R1, R3 are methyl; R2 is Br; R4, R5, R6, R7, R10 are hydrogen; R8, R9, R11 are methyl; R11 is ethyl; M is nickel; Y is O; and X is Br): Preparation of ligand L4 (represented by Formula O, wherein R1, R3 are methyl; R2 is Br; R4, R5, R6, R7, R10 are hydrogen; and R8, R9, R11 are methyl): Under nitrogen atmosphere, 2,6-dimethyl-4-bromo-aniline (2.45 g, 12 mmol) was dissolved in 20 ml of toluene, and 12 ml of trimethylaluminum (1.0M, 12 mmol) was added dropwise at normal temperature. The reaction was refluxed for 2 hours, and the system was then cooled to room temperature. Camphorquinone (0.831 g, 5 mmol) was added thereto, and the system was refluxed for 6 h. The reaction product was neutralized with aqueous sodium hydroxide solution, extracted with dichloromethane, and dried, and then subjected to a column chromatography to afford yellow ligand L4. Yield: 60.7%. 1HNMR (300 MHz, CDCl3), δ (ppm) [with an isomer ratio of 1.1:1]: major isomer: 7.05 (s, 4H, Ar—H), 2.18 (m, 12H, CAr—CH3), 1.85 (m, 4H, CH2), 1.37 (m, 1H), 1.26 (s, 3H, CH3), 1.06 (s, 6H, CH3); minor isomer: 7.02 (s, 4H, Ar—H), 2.04 (m, 12H, CAr—CH3), 1.85 (m, 4H, CH2), 1.37 (m, 1H), 1.26 (s, 3H, CH3), 0.96 (s, 6H, CH3).
A solution of 0.278 g (0.9 mmol) of (DME)NiBr2 in ethanol (10 mL) was added slowly dropwise to a solution of 0.477 g (0.9 mmol) of ligand L4 in dichloromethane (10 mL). The color of the solution immediately changed to deep red, and a large quantity of precipitants was formed. The reaction was stirred at room temperature for 6 h, and then anhydrous diethyl ether was added to perform precipitation. A filtration was performed to afford a filter cake, and the filter cake was washed with anhydrous diethyl ether and dried in vacuum to afford Ni4 as brownish-red powdery solids. Yield: 74.1%. Elemental analysis (calculated for C56H70Br10N4Ni3O2): C, 37.24; H, 3.91; N, 3.10; experimental value (%): C, 37.38; H, 4.30; N, 3.03.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 400 mL of hexane, 50 mL of 2-octene and 50 mL of 1-hexadecene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.5 mg (2.5 μmol) of complex Ni4. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 5 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
Preparation of complex Ni5 (represented by Formula IV, wherein R1, R2, R3 are methyl; R4, R5, R8-R10, R12-R14 are hydrogen; R11 is ethyl; M is nickel; Y is O; and X is Br):
A solution of 0.277 g (0.9 mmol) of (DME)NiBr2 in ethanol (10 mL) was added slowly dropwise to a solution of 0.249 g (0.6 mmol) of ligand L5 in dichloromethane (10 mL). The color of the solution immediately changed to deep red, and a large quantity of precipitants was formed. The reaction was stirred at room temperature for 6 h, and then anhydrous diethyl ether was added to perform precipitation. A filtration was performed to afford a filter cake, and the filter cake was washed with anhydrous diethyl ether and dried in vacuum to afford Ni5 as brownish-red powdery solids. Yield: 84.3%. Elemental analysis (calculated for C64H66Br6N4Ni3O2): C, 48.69; H, 4.21; N, 3.55; experimental value (%): C, 48.54; H, 4.47; N, 3.21.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 420 mL of hexane and 80 mL of 2-octene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni5. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 380 mL of hexane and 120 mL of 2-octene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni5. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below. It was found that the polymer contained 71.8 methyl branches, 6.4 ethyl branches, 4.2 propyl branches, 3.3 butyl branches, 2.7 pentyl branches, 9.0 branches having 6 or more carbon atoms, per 1000 carbon atoms.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 420 mL of hexane, 40 mL of 2-octene and 40 mL of 1-decene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni5. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 380 mL of hexane, 60 mL of 2-octene and 60 mL of 1-decene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni5. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 420 mL of hexane, 40 mL of 2-octene and 40 mL of 1-hexadecene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni5. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below. It was found that the obtained polymer had a melting point of 94.9° C.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 380 mL of hexane, 60 mL of 2-octene and 60 mL of 1-hexadecene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni5. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below. It was found that the obtained polymer had a melting point of 89.7° C.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 500 mL of hexane were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 μmol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni5. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 380 mL of hexane and 120 mL of 1-octene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.0 mg (2.5 μmol) of complex Ni5. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
Preparation of complex Ni6 (represented by Formula IV, wherein R1, R3 are methyl; R2, R4, R5, R8-R10, R12-R14 are hydrogen; R11 is ethyl; M is nickel; Y is O; and X is Br):
A solution of 0.277 g (0.9 mmol) of (DME)NiBr2 in ethanol (10 mL) was added slowly dropwise to a solution of 0.233 g (0.6 mmol) of ligand L6 in dichloromethane (10 mL). The color of the solution immediately changed to deep red, and a large quantity of precipitants was formed. The reaction was stirred at room temperature for 6 h, and then anhydrous diethyl ether was added to perform precipitation. A filtration was performed to afford a filter cake, and the filter cake was washed with anhydrous diethyl ether and dried in vacuum to afford Ni6 as brownish-red powdery solids. Yield: 78.2%. Elemental analysis (calculated for C60H58Br6N4Ni3O2): C, 47.33; H, 3.84; N, 3.68; experimental value (%): C, 47.38; H, 4.00; N, 3.46.
After having been continuously dried at 130° C. for 6 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 380 mL of hexane, 60 mL of 2-octene and 60 mL of 1-hexadecene were charged into the polymerization system, then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, and 3.8 mg (2.5 μmol) of complex Ni2 was added simultaneously. The reaction was stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
Preparation of complex Ni7 (represented by Formula III, wherein R1, R3 are Br, R2, R4, R5, R8-R10, R12-R14 are hydrogen, R11 is ethyl, M is nickel, Y is O, and X is Br):
A solution of 0.277 g (0.9 mmol) of (DME)NiBr2 in ethanol (10 mL) was added slowly dropwise to a solution of 0.389 g (0.6 mmol) of ligand L7 in dichloromethane (10 mL). The color of the solution immediately changed to deep red, and a large quantity of precipitants was formed. The reaction was stirred at room temperature for 6 h, and then anhydrous diethyl ether was added to perform precipitation. A filtration was performed to afford a filter cake, and the filter cake was washed with anhydrous diethyl ether and dried in vacuum to afford Ni7 as brownish-red powdery solids. Yield: 74.1%. Elemental analysis (calculated for C52H34Br14N4Ni3O2): C, 30.59; H, 1.68; N, 2.74; experimental value (%): C, 30.72; H, 1.97; N, 2.48.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 380 mL of hexane, 60 mL of 2-octene and 60 mL of 1-hexadecene were charged into the polymerization system, then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, and 5.1 mg (2.5 μmol) of complex Ni7 was added simultaneously. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
Preparation of complex Ni5 (represented by Formula II, wherein R1, R3, R3, R4 are methyl, R2, R4, R5 are hydrogen, R11 is ethyl, M is nickel, Y is O, and X is Br):
A solution of 0.277 g (0.9 mmol) of (DME)NiBr2 in ethanol (10 mL) was added slowly dropwise to a solution of 0.175 g (0.6 mmol) of ligand L8 in dichloromethane (10 mL). The reaction was stirred at room temperature for 6 h, and then anhydrous diethyl ether was added to perform precipitation. A filtration was performed to afford a filter cake, and the filter cake was washed with anhydrous diethyl ether and dried in vacuum to afford Ni5 as brownish-red powdery solids. Yield: 70.2%. Elemental analysis (calculated for C44H58Br6N4Ni3O2): C, 39.72; H, 4.39; N, 4.21; experimental value (%): C, 39.38; H, 4.60; N, 3.96.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 380 mL of hexane and 120 mL of 2-octene were charged into the polymerization system, then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, and 3.3 mg (2.5 μmol) of complex Ni5 was added simultaneously. The reaction was stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 380 mL of hexane, 60 mL of 2-octene and 60 mL of 1-decene were charged into the polymerization system, then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, and 3.3 mg (2.5 μmol) of complex Ni5 was added simultaneously. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 380 mL of hexane, 60 mL of 2-octene and 60 mL of 1-hexadecene were charged into the polymerization system, then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, and 3.3 mg (2.5 μmol) of complex Ni5 was added simultaneously. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 380 mL of hexane and 120 mL of 1-octene were charged into the polymerization system, then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, and 3.3 mg (2.5 μmol) of complex Ni5 was added simultaneously. The reaction was vigorously stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
Preparation of complex Ni9 (represented by Formula II, wherein R1, R3 are methyl, R2, R4, R5 are hydrogen, R3, R4 are p-fluorophenyl, R11 is ethyl, M is nickel, Y is O, and X is Br):
A solution of 0.277 g (0.9 mmol) of (DME)NiBr2 in ethanol (10 mL) was added slowly dropwise to a solution of 0.272 g (0.6 mmol) of ligand L9 in dichloromethane (10 mL). The color of the solution immediately changed to deep red, and a large quantity of precipitants was formed. The reaction was stirred at room temperature for 6 h, and then anhydrous diethyl ether was added to perform precipitation. A filtration was performed to afford a filter cake, and the filter cake was washed with anhydrous diethyl ether and dried in vacuum to afford Ni9 as brownish-red powdery solids. Yield: 74.1%. Elemental analysis (calculated for C64H62Br6F4N4Ni3O2): C, 46.57; H, 3.79; N, 3.39; experimental value (%): C, 46.72; H, 3.97; N, 3.48.
After having been continuously dried at 130° C. for 2 hrs, a 1 L stainless steel polymerization autoclave equipped with mechanical stirring was evacuated while hot and then filled with N2 gas 3 times. 380 mL of hexane, 60 mL of 2-octene and 60 mL of 1-hexadecene were charged into the polymerization autoclave, and then 1.0 mL of trimethylaluminum (1.0 mol/L solution in heptane), 12.8 mg (25.0 μmol) of tris(pentafluorophenyl)borane and 20.0 mg (25.0 μmol) of N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate were added thereto, followed by the addition of 4.1 mg (2.5 μmol) of complex Ni9. The reaction was stirred at 60° C. for 30 minutes, with ethylene pressure being maintained at 10 atm. The reaction mixture was neutralized with an ethanol solution acidified with 10 wt % hydrochloric acid to obtain a polymer. The results are shown in Table 1 below.
It can be seen from the data in Table 1 that, compared with the comparative examples catalyzing homopolymerization of ethylene and the comparative examples catalyzing copolymerization of α-olefins, the catalyst systems for preparing the polymer of the present invention have higher copolymerization activities even when catalyzing polymerization of mixed olefins comprising internal olefin monomers. GPC test results show that the molecular weight distribution of the polymer obtained by the present invention is a bimodal distribution.
Various embodiments of the present invention have been described above, and the foregoing descriptions are exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations without departing from the scope and spirit of the described embodiments will be apparent to those skilled in the art.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202110478113.2 | Apr 2021 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2022/081654 | 3/18/2022 | WO |
