IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
UP-0612890
(2006-12-19)
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등록번호 |
US-7714092
(2010-06-03)
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발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
3 인용 특허 :
7 |
초록
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The invention provides branched copolymers as precursors for preparing silicon carbide (SiC) ceramics represented by the general formulae: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn, Formula Type-I wherein n is the degree of polymerization, 0.1≦x<0.8, 0.2≦y<0.9
The invention provides branched copolymers as precursors for preparing silicon carbide (SiC) ceramics represented by the general formulae: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn, Formula Type-I wherein n is the degree of polymerization, 0.1≦x<0.8, 0.2≦y<0.9 and x+y=1; and R=methyl or H, R1 and R2 are randomly composed of hydrogen (H), allyl, methyl (Me), phenyl (Ph), propargyl or vinyl. Another branched copolymer is represented by the general formula: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn[SiR3R4CH2]zn Formula Type-II wherein n is the degree of polymerization, 0.1≦x<0.8, 0≦y<0.8, 0.2≦z<0.8 and x+y+z=1; and R=methyl or H, R1 and R2 are randomly composed of hydrogen (H), methyl (Me) and phenyl; R3 and R4 are randomly composed of H, allyl, methyl, phenyl (Ph), propargyl, and vinyl. The invention also provides methods for the preparation of such branched copolymers.
대표청구항
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What is claimed is: 1. A polycarbosilane, having a general formula: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn, where n is the degree of polymerization, ˜ represents a branched chain, 0.1≦x<0.8, 0.2≦y<0.9 and x+y=1, wherein R is selected from a group consisting of: a
What is claimed is: 1. A polycarbosilane, having a general formula: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn, where n is the degree of polymerization, ˜ represents a branched chain, 0.1≦x<0.8, 0.2≦y<0.9 and x+y=1, wherein R is selected from a group consisting of: a methyl (Me) and hydrogen (H), wherein each of R1 and R2 are independently selected from a group consisting of: allyl, hydrogen (H), methyl (Me), phenyl (ph), propargyl and vinyl. 2. The polycarbosilane of claim 1, wherein R1 and R2 are the same. 3. A polycarbosilane, having a general formula: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn[SiR3R4CH2]zn where n is the degree of polymerization, ˜ represents branched chain, 0.1≦x<0.8, 0≦y <0.8, 0.2≦z<0.8 and x+y+z=1, wherein R is selected from a group consisting of: hydrogen (H) and methyl (Me), wherein each of R1 and R2 are independently selected from a group consisting of: hydrogen (H), methyl (Me), and phenyl (ph) and wherein each of R3 and R4 are independently selected from a group consisting of: hydrogen, allyl, methyl, phenyl (ph), a propargyl and vinyl. 4. The polycarbosilane of claim 3, wherein R1 and R2 are the same. 5. The polycarbosilane of claim 3, wherein R3 and R4 are the same. 6. A method for preparing a carbosilane copolymer having a general formula: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn, where n is the degree of polymerization, ˜ represents branched chain, 0.1≦×<0.8, 0.2≦y<0.9 and x+y=1, wherein R is selected from a group consisting of hydrogen (H) and methyl (Me), wherein R1 and R2 are selected from a group consisting of hydrogen (H), allyl, methyl (Me), phenyl (Ph), propargyl or vinyl, the method comprising: a one-step Grignard reaction in an organic solvent between halocarbosilane co-monomers in the presence of magnesium, wherein the co-monomers have a general formula: XpSi(R3)qCHr,Xs where X is a halogen, R3 is a hydrogen atom or a monovalent hydrocarbon, 1≦p≦3, 1≦q≦2, 1≦r≦2 and 1s≦2. 7. The method according to claim 6, wherein X is chlorine. 8. The method according to claim 6, wherein R is methyl. 9. The method according to claim 6, wherein the organic solvent is tetrahydrofuran. 10. The method according to claim 6, wherein a catalyst is added to the Grignard reaction, the catalyst being selected from a group consisting of zinc, NaSCN and CuCN. 11. The method according to claim 6, wherein the Grignard reaction is carried out at a temperature between about 68° C. and about 74° C. 12. A method for preparing a carbosilane copolymer having a general formula: ([Si(˜)RC(˜)H]xn[SiR1R2CH2]yn[SiR3R4CH2]zn where n is the degree of polymerization, ˜ represents branched chain, 0.1≦x<0.8, 0≦y≦0.8, 0.2≦z<0.8 and x+y+z=1, wherein R is selected from a group consisting of: hydrogen (H) and methyl (Me), wherein R1 and R2 are selected from the group consisting of hydrogen (H), methyl (Me), or phenyl (Ph), wherein R3 and R4 are selected from the group consisting of hydrogen (H), allyl, methyl (Me), phenyl (Ph), propargyl or vinyl, the method comprising: a one-step Grignard reaction in an organic solvent between halocarbosilane co-monomers in the presence of magnesium, wherein the co-monomers have a general formula: XpSi(R5)qCHr,XS where X is a halogen, R5 is a hydrogen atom or a monovalent hydrocarbon, 1≦p≦3, 1≦q≦2, 1≦r≦2 and 1≦s≦2. 13. The method according to claim 12, wherein X is chlorine. 14. The method according to claim 12, wherein R is methyl. 15. The method of claim 12, wherein the organic solvent is tetrahydrofuran. 16. The method according to claim 12, wherein a catalyst is added to the Grignard reaction, the catalyst being selected from a group consisting of zinc, NaSCN and CuCN. 17. The method according to claim 12, wherein the Grignard reaction is carried out at a temperature between about 68° C. and about 74° C. 18. A method for preparing a copolymer carbosilane having a general formula: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn, where n is the degree of polymerization, ˜represents branched chain 0.1≦x<0.8, 0.2≦y <0.9 and x+y=1, wherein R is selected from a group consisting of: a methyl (Me) and hydrogen (H), wherein each of R1 and R2 is independently selected from a group consisting of: allyl, hydrogen (H), methyl (Me), phenyl (ph), propargyl and vinyl, the method comprising: a Grignard reaction between halocarbosilanes co-monomers and a reduction reaction to replace a functional group in a resulting copolymer, the halocarbosilane co-monomers having a general formula: XpSi(R3)qCHr,Xs where X is a halogen, R3 is a hydrogen atom or a monovalent hydrocarbon, 1≦p≦3, 1≦q≦2, 1≦r≦2 and 1≦s≦2. 19. The method according to claim 18, wherein the functional group is selected from a group consisting of halogens and methoxy groups. 20. The method according to claim 18, wherein a catalyst is added to the Grignard reaction, the catalyst being selected from a group consisting of zinc, NaSCN and CuCN. 21. The method according to claim 18, wherein the Grignard reaction is carried out at a temperature between about 68° C. and about 74° C. 22. The method according to claim 18, wherein the reduction reaction is carried out at a temperature between about 50° C. and about 70° C. 23. A method for preparing a copolymer carbosilane having a general formula as [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn[SiR3R4CH2]zn where n is the degree of polymerization, ˜ represents branched chain 0.1≦x≦0.8, 0≦y <0.8, 0.2≦z<0.8 and x+y+z=1, wherein R is selected from a group consisting of: hydrogen (H), and methyl (Me), wherein R1 and R2 are selected from the group consisting of hydrogen (H), methyl (Me), or phenyl (Ph), wherein R3 and R4 are selected from the group consisting of hydrogen (H), allyl, methyl (Me), phenyl (Ph), propargyl or vinyl, the method comprising: a Grignard reaction between halocarbosilanes co-monomers and a reduction reaction to replace a functional group in a resulting copolymer, the halocarbosilane co-monomers having a general formula: XpSi(R5)qCHr,Xs where X is a halogen, R5 is a hydrogen atom or a monovalent hydrocarbon, 1≦p≦3, 1≦q≦2, 1≦r≦ 2 and 1≦s≦2. 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 6820 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 polycarbosilane having a general formula: [Si(˜)RC(˜)H]xn[SiR1R2CH2]yn, where n is the degree of polymerization, ˜ represents branched chain, 0.1≦x<0.8, 0.2≦y<0.9 and x+y=1, wherein R is selected from a group consisting of hydrogen (H) and methyl (Me), wherein R1 and R2 are selected from a group consisting of hydrogen (H), allyl, methyl (Me), phenyl (Ph), propargyl or vinyl, the method comprising a partial methoxylation of a trihalocarbosilane, a Grignard reaction of the partially methoxylated trihalocarbosilane and a reduction of the partially methoxylated trihalocarbosilane. 29. The method according to claim 28, 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. 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[SiR3R4CH2]zn where n is the degree of polymerization, ˜ represents branched chain, 0.1≦x<0.8, 0≦y<0.8, 0.2≦z<0.8 and x+y+z=1, wherein R is selected from a group consisting of: hydrogen (H), and methyl (Me), wherein R1 and R2 are selected from the group consisting of hydrogen (H), methyl (Me), or phenyl (Ph), wherein R3 and R4 are selected from the group consisting of hydrogen (H), allyl, methyl (Me), phenyl (Ph), propargyl or vinyl, the method comprising a partial methoxylation of a trihalocarbosilane, a Grignard reaction of the partially methoxylated trihalocarbosilane and a reduction of the partially methoxylated trihalocarbosilane. 34. The method according to claim 33, 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. 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.
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