Method for forming new preceramic polymers containing silicon

Details Method for forming new preceramic polymers containing silicon Method for forming new preceramic polymers containing silicon

C - Chemistry, Metallurgy

08

G

402/11

C08G 77/60 (2006.01) C08L 83/16 (2006.01) G03F 7/075 (2006.01)

Patent

CA 1272834

ABSTRACT A method of forming preceramic polymers by mixing (A) an organic polysilane, preferably either a methylpolysilane of the formula [(RSiH)x(RSi)y]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 carbon atoms, a tri(lower)alkyl- or di(lower)alkylsilyl group x+y=l, (x and y are each > 0 and also x=1, y=o), and n is an integer greater than 1) or a polycarbosilane having repeat units of the formula [RaSi(H)-(CH2)q], [RaSi(H)-CH-CH], and [RaSi(H)-C?C] (where Ra 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 carbons atoms, q is an integer 1 or greater), with (B) an organic, organisilicon or organoelement compound having at least two alkenyl groups and allowing the mixture to react is disclosed. Preferably, the alkenyl group is a vinyl group. The reaction is preferably initiated by the generation of reactive free radicals. Novel preceramic polymers formed by this method are also disclosed.

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