C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/17
C08G 77/12 (2006.01) C04B 35/571 (2006.01) C04B 35/589 (2006.01) C08G 77/54 (2006.01) C08L 83/16 (2006.01)
Patent
CA 1281477
ABSTRACT OF THE DISCLOSURE A method of forming preceramic polymers using a polysiloxane having repeat units of the formula [RSi(H)O]n (where R is a lower alkyl group having from 1 to about 6 carbon atoms, a cycloalkyl group having from 3 to about 6 carbon atoms, a substituted or unsubstituted lower aryl group having from 6 to about 10 carbons atoms, n is an integer 1 or greater), by reacting it with a (poly)silylamide is disclosed. Preferably, the poly(silylamide) is a polymeric alkali metal silylamide of the formula [(R1SiHNH)a(R1SiN)b(R1SiHNM)c]m where a + b + c = 1; R1 is a lower alkyl group having from 1 to about 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having from 3 to about 6 carbon atoms, a substituted or unsubstituted alkenyl group having from 2 to about 6 carbon atoms, a substituted or unsubstituted lower aryl group having from 6 to about 10 carbon atoms, a tri(lower)alkyl- or di(lower)alkylsilyl group or a di(lower)alkylamino group; M is an alkali metal or one-half equivalent of an alkaline earth metal; and m is an integer greater than 1. Preferably, a weight ratio of polysiloxane:silylamide of 15:1 to 1:15 is used. Novel preceramic polymers formed by this method are also disclosed.
533946
Seyferth Dietmar
Targos Tom S.
Yu Yuan-Fu
Massachusetts Institute Of Technology
Seyferth Dietmar
Swabey Ogilvy Renault
Targos Tom S.
Yu Yuan-Fu
LandOfFree
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