| 摘要 |
<p>A method of forming preceramic polymers by mixing (A) an organic polysilane, preferably either a methylpolysilane of the formula ¢(RSiH)x(RSi)y!n, (where R is a lower alkyl group having from 1 to about 6 carbon atoms, a cycloalkyl group having from 3 to about 6 carbon atoms, a substituted or unsubstituted lower aryl group having from 6 to about 10 carbon atoms, a tri(lower)alkyl- or di(lower)alkylsilyl group x+y=l, (x and y are each > 0 and also x=1, y=o), and n is an integer greater than 1) or a polycarbosilane having repeat units of the formula ¢RaSi(H)-(CH2)q!, ¢RaSi(H)-CH-CH!, and ¢RaSi(H)-C?C! (where Ra is H, a lower alkyl group having from 1 to about 6 carbon atoms, a cycloalkyl group having from 3 to about 6 carbon atoms, a substituted or unsubstituted lower aryl group having from 6 to about 10 carbons atoms, q is an integer 1 or greater), with (B) an organic, organisilicon or organoelement compound having at least two alkenyl groups and allowing the mixture to react is disclosed. Preferably, the alkenyl group is a vinyl group. The reaction is preferably initiated by the generation of reactive free radicals. Novel preceramic polymers formed by this method are also disclosed.</p> |
