TREA

COMPOSITION, PREPARATION OF POLYCARBOSILANES AND THEIR USES

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Information

  • Patent Application
  • 20070167599
  • Publication Number
    20070167599
  • Date Filed
    December 19, 2006
    18 years ago
  • Date Published
    July 19, 2007
    17 years ago
Information
Abstract
The invention provides branched copolymers as precursors for preparing silicon carbide (SiC) ceramics represented by the general formulae:
Description
Claims
  • 1. A polycarbosilane, having a general formula: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn,
  • 2. The polycarbosilane of claim 1, wherein R is selected from a group consisting of: a methyl (Me) and hydrogen (H).
  • 3. The polycarbosilane of claim 1, wherein each of R1 and R2 is independently selected from a group of radicals consisting of: allyl, hydrogen (H), methyl (Me), phenyl (ph), propargyl and vinyl.
  • 4. The polycarbosilane of claim 3, wherein R1 and R2 are the same.
  • 5. A polycarbosilane, having a general formula: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn[SiR3R4CH2]zn
  • 6. The polycarbosilane of claim 5, wherein R is selected from a group consisting of: hydrogen (H) and methyl (Me).
  • 7. The polycarbosilane of claim 5, wherein each of R1 and R2 is independently selected from a group consisting of: hydrogen (H), methyl (Me), and phenyl (ph).
  • 8. The polycarbosilane of claim 7, wherein R1 and R2 are the same.
  • 9. The polycarbosilane of claim 5, wherein each of R3 and R4 is independently selected from a group consisting of: hydrogen, allyl, methyl, phenyl (ph), a propargyl and vinyl.
  • 10. The polycarbosilane of claim 9, wherein R3 and R4 are the same.
  • 11. A method for preparing a carbosilane copolymer having a general formula: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn,
  • 12. The method according to claim 11, wherein X is chlorine.
  • 13. The method according to claim 11, wherein R is methyl.
  • 14. The method according to claim 11, wherein the organic solvent is tetrahydrofuran.
  • 15. The method according to claim 11, wherein a catalyst is added to the Grignard reaction, the catalyst being selected from a group consisting of zinc, NaSCN and CuCN.
  • 16. The method according to claim 11, wherein the Grignard reaction is carried out at a temperature between about 68° C. and about 74° C.
  • 17. A method for preparing a carbosilane copolymer having a general formula: ([Si(˜)RC(˜)H]xn[SiR1R2CH2]yn[SiR3R4CH2]zn
  • 18. The method according to claim 17, wherein X is chlorine.
  • 19. The method according to claim 17, wherein R is methyl.
  • 20. The method of claim 17, wherein the organic solvent is tetrahydrofuran
  • 21. The method according to claim 17, wherein a catalyst is added to the Grignard reaction, the catalyst being selected from a group consisting of zinc, NaSCN and CuCN.
  • 22. The method according to claim 17, wherein the Grignard reaction is carried out at a temperature between about 68° C. and about 74° C.
  • 23. A method for preparing a copolymer carbosilane having a general formula: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn,
  • 24. The method according to claim 23, wherein the functional group is selected from a group consisting of halogens and methoxy groups.
  • 25. The method according to claim 23, wherein a catalyst is added to the Grignard reaction, the catalyst being selected from a group consisting of zinc, NaSCN and CuCN.
  • 26. The method according to claim 23, wherein the Grignard reaction is carried out at a temperature between about 68° C. and about 74° C.
  • 27. The method according to claim 23, wherein the reduction reaction is carried out at a temperature between about 50° C. and about 70° C.
  • 28. A method for preparing a copolymer carbosilane having a general formula as [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn[SiR3R4CH2]zn
  • 29. The method according to claim 28, wherein the functional group is selected from a group consisting of halogens and methoxy groups.
  • 30. The method according to claim 28, wherein a catalyst is added to the Grignard reaction, the catalyst being selected from a group consisting of zinc, NaSCN and CuCN.
  • 31. The method according to claim 28, wherein the Grignard reaction is carried out at a temperature between about 68° C. and about 74° C.
  • 32. The method according to claim 28, wherein the reduction reaction is carried out at a temperature between about 50° C. and about 70° C.
  • 33. A method for preparing a polycarbosilane having a general formula: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn,
  • 34. The method according to claim 33, wherein the partially methoxylated trihalocarbosilane has two general formula: Cl3-m(OMe)mSiCH2Cl, where 1.5≦m≦2.5, and (OMe)pCl2-pSiCHCl2, where 0<p≦1.
  • 35. The method according to claim 33, wherein a catalyst is added to the Grignard reaction, the catalyst being selected from a group consisting of zinc, NaSCN and CuCN.
  • 36. The method according to claim 33, wherein the Grignard reaction is carried out at a temperature between about 68° C. and about 74° C.
  • 37. The method according to claim 33, wherein the reduction reaction is carried out at a temperature between about 50° C. and about 70° C.
  • 38. A method for preparing a polycarbosilane having a general formula: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn[SiR3R4CH2]zn
  • 39. The method according to claim 38, wherein the partially methoxylated trihalocarbosilane includes the general formula: Cl3-m(OMe)mSiCH2Cl, where 1.5≦m≦2.5, and (OMe)pCl2-pSiCHCl2, where 0<p≦1.
  • 40. The method according to claim 38, wherein a catalyst is added to the Grignard reaction, the catalyst being selected from a group consisting of zinc, NaSCN and CuCN.
  • 41. The method according to claim 38, wherein the Grignard reaction is carried out at a temperature between about 68° C. and about 74° C.
  • 42. The method according to claim 38, wherein the reduction reaction is carried out at a temperature between about 50° C. and about 70° C.
Provisional Applications (1)
Number Date Country
60758711 Jan 2006 US