| 摘要 |
Vinyl-containing polysilanes of the average formula [R2Si][RSi][Rd'(CH2=CH)Si] where R is an alkyl radical containing 1 to 4 carbon atoms, R' is an alkyl radical containing 1 to 4 carbon atoms, a 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 [Rd'(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 DEG C. Shaped articles prepared from the vinyl-containing polysilanes may be rendered infusible prior to pyrolysis by exposure to air or ultraviolet light. |
