Silicon carbide preceramic vinyl-containing silane polymers

C - Chemistry – Metallurgy – 07 – F

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C07F 7/08 (2006.01) C01B 31/36 (2006.01) C04B 35/571 (2006.01) C04B 35/622 (2006.01) C04B 35/632 (2006.01) C04B 35/634 (2006.01) C08G 77/60 (2006.01)

Patent

CA 1253515

SILICON CARBIDE PRECERAMIC VINYL-CONTAINING POLYMERS ABSTRACT Vinyl-containing polysilanes of the average formula [R2Si][RSi][R'd(CH2=CH)Si] where R is an alkyl radical containing 1 to 4 carbon atoms, R' is an alkyl radical containing l to 4 carbon atoms, 2 vinyl radical, or a phenyl radical, d is 1 or 2 and where the polysilane contains 0 to 60 mole percent [R2Si] units, 30 to 99.5 mole percent [RSi] units, and 0.5 to 15 mole percent [R'd(CH2=CH)Si] units are disclosed. The vinyl- containing polysilanes may be converted to silicon carbide- containing ceramics by pyrolysis in an inert atmosphere or in a vacuum at temperatures greater than 800°C. Shaped articles prepared from the vinyl-containing polysilanes may be rendered infusible prior to pyrolysis by exposure to air or ultraviolet light.

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