초록 ▼

A method of forming preceramic polymers using a polycarbosilane having repeat units of the formula [RSi(H)－(CH2)q](where R 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

A method of forming preceramic polymers using a polycarbosilane having repeat units of the formula [RSi(H)－(CH2)q](where R 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), by reacting it with alkali metal silylamides in a weight ratio of polycarbosilane:silylamide of 10:1 or less is disclosed. Preferably, the alkali metal silylamide is a polymeric alkali metal silylamide of the formula [(R1SiHNH)a(R1SiN)b(R1SiHNM)c]m where a+b+c=1; R1 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 1. Novel preceramic polymers formed by this method are also disclosed.

대표청구항 ▼

A method for preparing novel preceramic organosilicon polymers, wherein the method comprises: (a) admixing with a silylamide in an organic solvent a polycarbosilane having at least 25 mole % of repeat units of the formula RSi(H)-(CH2)q]where R is H, a lower alkyl group having from 1 to about 6 carbo

A method for preparing novel preceramic organosilicon polymers, wherein the method comprises: (a) admixing with a silylamide in an organic solvent a polycarbosilane having at least 25 mole % of repeat units of the formula RSi(H)-(CH2)q]where R is H, a lower alkyl group having from 1 to about 6 carbon atoms, a cycloalkyl group having 3 to about 6 carbon atoms, or a substituted or unsubstituted lower aryl group having from 6 to about 10 carbon atoms, and q is an integer 1 or greater, wherein the weight ratio of polycarbosilane: silylamide is about 10:1 or less; (b) allowing the admixture of step (a) to react at room temperature or above; and (c) quenching the reaction mixture with a reactive electrophile, when a metal silylamide is used, thereby forming said organosilicon polymer.