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Method for forming new preceramic polymers for SiC and Si.sub.3 N4/SiC
Method for forming new preceramic polymers for SiC and Si.sub.3 N4/SiC
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机译:形成用于SiC和Si.sub.3 N4 / SiC的新型陶瓷前聚合物的方法
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摘要
A method of forming preceramic polymers using a organopolysilane of the formula [(RSiH).sub.x (RSi).sub.y ].sub.n, where R is a lower alkyl group having from 1 to about 6 carbon atoms, a lower alkenyl group having from 2 to about 6 carbon atoms, a substituted or unsubstituted lower aryl group having from 6 to about 10 carbons atoms, a tri(lower)alkyl- or di(lower)alkylsilyl group and n is an integer greater than 1, and reacting it with alkali metal amides or silylamides in catalytic quantities is disclosed. Preferably, the alkali metal amide is a polymeric alkali metal silylamide of the formula [(R.sup.1 SiHNH).sub.a (R.sup.1 SiN).sub.b (R.sup.1 SiHNM).sub.c ].sub.m where a+b+c=I; R.sup.1 is a lower alkyl group having from 1 to about 6 carbon atoms, a substituted or unsubstituted alkenyl group having from 2 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 or a di(lower)alkylamino group; M is an alkali metal or one-half equivalent of an alkaline earth metal; and n and m are integers greater than I. Novel preceramic polymers formed by this method are also disclosed.
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机译:一种使用式[(RSiH)x(RSi)y] n的有机聚硅烷形成预陶瓷聚合物的方法,其中R是具有1至约6个碳原子的低级烷基,具有2至约6个碳原子的低级烯基,具有6至约10个碳原子的取代或未取代的低级芳基,三(低级)烷基或二(低级)烷基甲硅烷基,且n为大于1的整数公开了其与催化量的碱金属酰胺或甲硅烷基酰胺反应。优选地,碱金属酰胺是式[(R.1 SiHNH).sub。(R.1 SiN).b。(R.1 SiHNM).sub的聚合碱金属甲硅烷基酰胺。 .c] .m,其中a + b + c = I; R 1是具有1至约6个碳原子的低级烷基,具有2至约6个碳原子的取代或未取代的烯基,具有6至约10个碳原子的取代或未取代的低级芳基,三(低级)烷基-或二(低级)烷基甲硅烷基或二(低级)烷基氨基; M是碱金属或碱土金属的一半当量; n和m是大于I的整数。还公开了通过该方法形成的新型陶瓷前聚合物。
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