Method of preparing polycarbosilanes

Details Method of preparing polycarbosilanes Method of preparing polycarbosilanes

C - Chemistry, Metallurgy

08

G

402/11

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

Patent

CA 1160393

- 13 - Abstract: Method of preparing polycarbosilanes There is disclosed a method of preparing polycarbo- silanes having high molecular weight and also having the major structural unit of silicon-carbon linkage. The method comprises heating a polysilane at 50 - 600°C. in atmosphere of an inert gas and distilling out a low molecular weight polycarbosilane fraction having the number mean molecular weight of 300 - 600, followed by polymerizing the fraction by heating it at 250 - 500°C. in atmosphere of an inert gas. The polycarbosilane obtained by the method of the present invention are useful for the precursor of preparing silicon carbide fibres and shaped articles.

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