| 摘要 |
SILICON CARBIDE PRECERAMIC VINYL-CONTAINING POLYMERS 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 vinylcontaining polysilanes may be converted to silicon carbidecontaining ceramics by pyrolysis in an inert atmosphere or in a vacuum at temperatures greater than 800.degree.C. Shaped articles prepared from the vinyl-containing polysilanes may be rendered infusible prior to pyrolysis by exposure to air or ultraviolet light. |
