Preceramic polycarbosilane derivatives

Details Preceramic polycarbosilane derivatives Preceramic polycarbosilane derivatives

C - Chemistry, Metallurgy

08

G

402/11

C08G 77/60 (2006.01) C04B 35/00 (2006.01) C04B 35/571 (2006.01)

Patent

CA 1305811

PRECERAMIC POLYCARBOSILANE DERIVATIVES ABSTRACT Halogenated polycarbosilanes are prepared by reacting a polycarbosilane containing at least 0.1 weight percent Si-H groups with a halogenating reagent selected from the group consisting of chlorine, bromine, phosphorus pentachloride, phosphorus pentabromide, antimony pentachloride, N-chlorosuccinimide, N-bromosuccinimide, sulfonyl chloride, and mixtures of CHeXf and a free radical initiator where e is 0 or 1, f is 3 or 4, the sum (e + f) is 4, and X is chlorine or bromine. The halogenated polycarbo- silanes can be further treated to produce other derivatized polycarbosilanes. The halogenated and derivatized polycarbo- silanes can be converted to silicon carbide containing ceramic materials by pyrolysis at elevated temperatures under an inert atmosphere.

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