Method of producing silicon carbide preceramic...

Details Method of producing silicon carbide preceramic... Method of producing silicon carbide preceramic...

C - Chemistry, Metallurgy

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402/11, 261/6

C08G 77/60 (2006.01) C04B 35/571 (2006.01) C08F 2/48 (2006.01) C08F 30/08 (2006.01) C08G 77/00 (2006.01)

Patent

CA 1305812

AN IMPROVED METHOD OF PRODUCING SILICON CARBIDE PRECERAMIC VINYL-CONTAINING POLYMERS ABSTRACT Vinyl-containing polysilanes are described wherein the vinyl groups are attached to endblocking sites of intermediate reactivity. These vinyl-containing polysilanes are prepared by reacting a halogen-endblocked polysilane with, first, a non-vinyl-containing Grignard reagent or a non-vinyl organolithium compound whereby the most reactive halogen endblocking groups are replaced; then, second, reacting the resulting polysilane with vinyl Grignard reagent or vinyllithium whereby the halogen endblocking groups of intermediate reactivity are replaced; and, third, reacting the resulting polysilane with a non-vinyl-containing Grignard reagent or a non-vinyl organolithium compound whereby the least reactive halogen endblocking groups are replaced. The vinyl-containing polysilanes can be converted to ceramic materials, including ceramic fibers, by pyrolysis.

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