Organopolysilazane precursors to silicon nitride-rich mixed...

Details Organopolysilazane precursors to silicon nitride-rich mixed... Organopolysilazane precursors to silicon nitride-rich mixed...

C - Chemistry, Metallurgy

04

B

402/11

C04B 35/58 (2006.01) C08G 77/60 (2006.01) C08L 83/16 (2006.01)

Patent

CA 1281475

ABSTRACT A method for preparing preceramic polymers is disclosed. This method includes the steps of reacting in solution anhydrous ammonia with a mixture of R1SiHX2 (where R1 is a lower alkyl group having from 1 to about 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having from 3 to about 6 carbon atoms, a substituted or unsubstituted lower alkenyl group having from 2 to about 6 carbon atoms, or a substituted or unsubtituted lower aryl group having from 6 to about 10 carbon atoms, and X is a halogen) and RSiX3 (where R is H, a lower alkyl group having from 1 to about 6 carbon atoms, a substituted or unsubstituted cycloalkyl group having from 3 to about 6 carbon atoms, a substituted or unsubstituted lower alkenyl group having from 2 to about 6 carbon atoms, or a substituted or unsubstituted lower aryl group having from 6 to about 10 carbon atoms), thereby forming a mixture of precursor polymers; and reacting the precursor polymers in the presence of a basic catalyst capable of deprotonating the NH functions in the precursor polymers to form the preceramic polymer. Preferably, this preceramic polymer is treated with an electrophile compound. Pyrolyzing the polymer in an inert gas stream or ammonia atmosphere to form a ceramic material is also disclosed.

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