Patent Application
20140316073
The present invention is directed to polymeric compositions, particularly to polymers and polymeric compositions that exhibit magnetic or electromagnetic characteristics. The present invention is also directed to polymers and polymeric compositions that incorporate nanoparticulate material either associated with the polymeric structure or incorporated into the polymeric structure itself.
The presence of fillers in a polymer resin can improve mechanical and chemical properties of the base material. For example, increasing the amount of fillers in epoxy systems and by using higher modulus fillers such as micron-size material such as silica, alumina, silicon carbide and the like can increase the modulus of the resulting composites. Filled or reinforced polymers have been used for many years in various applications such as synthetic rubbers, epoxy-fiberglass composites, paints and the like.
Fillers have also been used to provide or enhance conductive properties of various polymeric materials. However the ability to provide polymeric material that has ferroelectric properties has been limited. Therefore, it would be desirable to provide polymeric material that exhibits ferroelectric properties. It would also be desirable to provide a polymer or polymers incorporating nanoparticulate material in a manner that provides the polymeric material with the ability to exhibit magnetic or ferromagnetic qualities.
Therefore, there is a continuing need for polymers with improved properties including ferromagnetic properties. There is also a need for polymeric precursors that can be utilized to form various polymeric compounds.
Disclosed herein is a polymeric composition that includes at least one polymer and an effective amount of a nanoparticulate component. The nanoparticulate component includes at least one of the following: inorganic functional nanoparticulate compounds and graphene in which the nanoparticulate component is associated with the polymer. The polymer disclosed herein can have electromagnetic activity. The resulting polymer may exhibit a measurable electrical conductivity (σ) range of 10−14 to 4.7*106 (S/m) at 20° C.
Also disclosed herein is a polymeric precursor that includes at least one component selected from the group that includes isocyanates, polyisocyanates, MDI-terminated prepolymers and an effective amount of a nanoparticulate component. The nanoparticulate component is at least one of an inorganic functional nanoparticulate component being at least one of an inorganic functional nanoparticulate compounds and/or graphene that is associated with the prepolymer.
In the present disclosure reference is made to the following various drawings in which like reference numerals are used for like elements throughout the various figures. The drawing figures are for illustrative purposes only and include the following:
Broadly disclosed herein, the present disclosure is directed to a polymer that comprises at least one polymer and an effective amount of a nanoparticulate component. The nanoparticulate component is at least one of an inorganic functional nanoparticulate compound or compounds and graphene. The nanoparticulate component is associated with the polymer in a manner that enhances at least one characteristic including but not limited to ferromagnetism, magnetism, conductivity and the like.
Without being bound to any theory, it is believed that the polymeric material disclosed herein can be composed of a network of nanoparticles that are integrated into the polymeric structure. Nanoparticles can be integrated into either the polymeric backbone, one or more side chains present in the polymeric structure or both. In certain instances, it is theorized that the network of nanoparticles can be homogeneous or essentially homogeneous.
Broadly disclosed, the present disclosure is directed to a polymeric composition that includes at least one polymer and an effective amount of a nanoparticulate component that is associated with the polymer. The nanoparticulate component can be at least one of an organofunctional nanoparticulate compound and/or graphene. The nanofunctional nanoparticulate component can be a mixture of organofunctional nanoparticulate compound and/or graphene.
As defined herein, the term “associated with the at least one polymer component” can include situations in which the nanoparticulate component is integrated into interpenetrating networks present in the polymeric compound as formed. It is also contemplated that the nanoparticulate component can be integrated into the backbone of the polymer and/or integrated into one or more side chains present in the polymer.
Non-limiting examples of polymers suitable for use in the polymeric composition disclosed herein include one or more of the following: polyester polyols, copolyesters, polyacrylates, unsaturated polyesters, polyamines and polysulfides as well of mixtures of any of the foregoing. The polymer employed in the composition can have any suitable molecular weight. In certain embodiments, the polymer present in the polymeric composition as can have a molecular weight between about 2000 and 150000. In certain embodiments, it is contemplated that the polymer can have a molecular weight between about 4000 and 12000.
In other embodiments, it is contemplated that the polymer can be a two-part thermosetting material, examples of which include but are not limited to polysulfides, polyacrylates, polyurethanes and the like. The thermosetting polymer can have a suitable molecular weight such as between about 100 and 150000. In certain embodiments, it is contemplated that the polymer can have a molecular weight between about 1000 and 18000.
It is contemplated that the materials and methods disclosed herein can be effectively employed with various thermosetting polymers and their thermoplastic analogs. Thus, polyolefin-based materials and other thermoplastic materials are to be considered within the purview of this disclosure.
The nanoparticulate component can be composed of one or more organometallic compounds that are present with or without graphene. In certain embodiments, it is also contemplated that the nanoparticulate component can be composed solely of graphene. In addition to graphene, non-limiting examples of materials suitable for use as the nanoparticulate component include an inorganic salt or inorganic salts that contain a cationic component. Suitable cationic components include one or more of the following: Fe II, Fe III, Cu I, Cu II, Pb II, Pb IV, Au I, Au III, Ni I, Ni II, Ni III, Ni IV, Co II, Co III. These materials can be used individually or in various combinations. In certain embodiments of the polymeric composition as disclosed herein, the nanoparticulate component can be at least one of the following: ferrite nanoparticles, alnico nanoparticles, rare earth magnetic nanoparticles. Non-limiting examples of rare earth magnetic nanoparticles include materials such as neodymium and/or samarium-cobalt. These materials can be used individually or in any suitable combination.
Inorganic nanoparticulate materials can also be classified as ferromagnetic nanoparticles, ferrimagnetic nanoparticles, or antiferrimagnetic nanoparticles. Without being bound to any theory, it is believed that ferromagnetic nanoparticles are materials that have permeabilities greater than unity and demonstrate increasing magnetization with an applied magnetizing field. The effect is caused by the alignment of electron spin in regions called domains. Ferrimagetic nanoparticles are those, like ferromagnetic particles, that hold spontaneous magnetization below the Curie temperature but show no magnetic order (i.e. are paramagnetic) above this temperature. In ferromagnetic material, the magnetic moments of the atoms on different sublattices are opposed with the opposing moments being unequal such that when the opposing moments are unequal, a spontaneous magnetization remains. This can occur when the sublattices consist of different materials or ions such as Fe2+ and Fe3+. Non-limiting examples of ferromagnetic materials include various ferrites as well as magnetic garnet material, for example yttrium iron garnet and ferrites composed of iron oxides as well as other elements such as aluminum, cobalt, nickel, manganese and zinc.
For purposes of this disclosure, antiferrimagnetic materials are considered to be those in which the magnetic moments of the atoms or molecules align in a regular pattern with neighboring spins on different sublattices exhibiting a generally ordered magnetism. Non-limiting examples of material exhibiting antiferrimagnetic characteristics can be transition metal compounds, especially oxides. Specific materials can include, but are not limited to, hematites, metals such as chromium, and various alloys such as iron manganese as well as oxides such as nickel oxide.
“Graphene”, as that term is used herein, is defined as a substance composed of pure carbon arranged in a regular hexagonal pattern similar to graphite but in a one-atom thick sheet present in nanoparticulate scale. Various analogs of graphene can also be successfully employed in various embodiments of the material disclosed herein. Non-limiting examples of suitable analogs include silicon analogs such as silicone. It is also contemplated that various organometallic compounds can be employed include, but are not limited to, various metallocenes such as ferrocene, cobaltocene and the like. Also suitable for use in the material are various oxides, hydroxides as well as mixtures of the two. Non-limiting examples of suitable oxides are FeO, Fe2O3, Fe3O4 and the like. Non-limiting examples of various hydroxides include hydroxides of Fe, Cu, Pb, Ni, and Co.
The nanoparticulate material can have a particle size less than 100 nm. In certain specific embodiments, the nanoparticulate material can have a particle size less than about 50 nm. In other embodiments, the nanoparticulate material can have a particle size less than about 20 nm. The nanoparticulate compound can be functionalized from within the polymer matrix with a suitable functionalizing compound if desired or required. Suitable functionalizing compounds can be one or more of the following: amine compounds, sulfide compounds, epoxide compounds, carbonyl compounds and the like.
The nanoparticulate material can be chemically bonded to at least one polymer component in the composition. In certain embodiments, it is contemplated that nanoparticulate material can be integrated into either the polymeric backbone and/or polymeric side chains. The nanoparticulate material will be present in the associated composition in an amount sufficient to provide a composition having an electromagnetic activity in a range between 1 emu/gram and about 50 emu/gram. In certain embodiments, the nanoparticulate material will be present in an amount sufficient to provide a measurable electrical conductivity (σ) range of 10−14 to 4.7*106 (S/m) at 20° C.
Without being bound to any theory, it is believed that in certain embodiments, the nanoparticulate material integrates in the polymer in one of the following manners:
The nanoparticles can have various functionalized monolayers which can lead to various reaction products depending on the polymer employed. The following are non-limiting representative examples:
Functionalized Monolayers on Nanoparticles and Reaction Examples
In order to better understand the invention disclosed herein, the following examples are presented. The examples are to be considered illustrative and are not to be viewed as limiting the scope of the present disclosure or claimed subject matter.
In order to ascertain whether nanoparticulate materials and/or graphene can be successfully incorporated into various polymeric compounds to produce materials with novel electric or magnetic characteristics, various polymeric formulations are investigated. The materials to be investigated will be polyurethanes, nitrile formulations etc.
Various polyester formulations can be prepared. For example Formulations 1 and 2 can be formed by the melt mix reaction of the components outlined Table I performed under neutral atmosphere or vacuum for an interval of about 2 hours. The resulting materials have a Shore A value of between 41 and 48 when fully cured.
Multiple versions of the formulations in Tables 11 and 11 are prepared. The Dynacol materials are each reacted at 110° C. under nitrogen and mixed slowly for 20 minutes. After 20 minutes a respective measures portion of one of the following additives is added to a given formulation sample graphene at grades H-15, M-15 and C-500 respectively, as well as iron oxide nanoparticles present as Fe2O3 or Fe2O4, after which time the heat input is discontinued.
4,4″ MDI is added after heat addition is discontinued. The reaction temperature is monitored and not allowed to exceed 130° C. The reaction is permitted to proceed to completion (about 24 hours) while the reaction temperature is maintained between 110° C. and 130° C. The reaction temperature remains steady and no exotherm is predicted during the reaction time.
Formulation 2 is prepared with the addition of nanoparticulate material. This is accompanied by an observed exothermic spike associated with the addition of the nanoparticulate occurring prior to the addition of the MDI. Reaction temperatures of between 110° C. and 130° C. However temperatures of 140° C. are observed indicating that the introduced nanoparticles are reacting with the polymer as it is being formed with at least a portion of the nanoparticulate material is integrated into the backbone of the polymer as it is formed. It is hypothesized that the nanoparticulate material is integrated in to the polymer in a generally homogeneous or near homogeneous fashion. A representative exotherm prediction is set forth in
The results of Example II are replicated using the materials set forth in Table III. The Dynacol materials are heated to 110° C. under nitrogen for 20 minutes. Once the material is molten, the heating progresses with steady mixing. After this, Fe3O4 (5%) nanoparticles having an average particle size greater than 50 nm are added under nitrogen with mixing. Once added, the resulting material is mixed for 20 minutes after which the heating is discontinued and temperatures recorded prior to addition of MDI. The MDI is added and the temperature is not allowed to exceed 130° C. during a mix/reaction interval of 2 hours.
Two-part polysulfide is evaluated for use in the composition disclosed herein. The components and amounts of the paste component are set forth in Table IV. The defoaming agent Santicizer is added to the Airex 900 component and mixed for about 5 minutes. When this step is completed, the diphenylguanidine component is added to the composition in powder form and is mixed to ensure proper distribution throughout the material. Magnesium oxide can be added in small additions allowing at least one minute between additions with additional mixing after completed magnesium oxide together with degassing. The resulting material is a homogeneous paste or liquid. The polysulfide resin can be prepared by admixing the materials set forth in Table V. The prepared nanoparticulate can be added to the resin component in multiple portions with shear mixing for approximately 80 minutes under a nitrogen blanket.
The two components can be admixed at a ratio of 10 parts paste to 100 parts resin component with stirring for about three minutes. The material can be caste on a suitable release surface and allowed to polymerize.
While the invention has been described in connection with certain embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims, which scope is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures as is permitted under the law.
The present invention claims priority to U.S. Provisional Application No. 61/792,934 filed on Mar. 15, 2013 currently pending in this matter.
| Number | Date | Country | |
|---|---|---|---|
| 61792934 | Mar 2013 | US |
