Method for converting si-h containing polycarbosilanes to...

Details Method for converting si-h containing polycarbosilanes to... Method for converting si-h containing polycarbosilanes to...

C - Chemistry, Metallurgy

08

L

400/5315, 402/9

C08L 83/16 (2006.01) C08G 77/60 (2006.01)

Patent

CA 1263796

ABSTRACT A method of forming preceramic polymers using a polycarbosilane having repeat units of the formula [RSi(H)-(CH2)q] (where R is H, 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 carbon atoms, q is an integer 1 or greater), by reacting it with alkali metal silylamides in a weight ratio of polycarbo- silane:silylamide of 10:1. or less is disclosed. Preferably, the alkali metal silylamide is a poly- meric 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 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 n and m are integers greater than 1. Novel preceramic polymers formed by this method are also disclosed.

581792

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