发明名称 |
Preparation of silicon carbide ceramics from the modification of an Si-H containing polysilane |
摘要 |
A method of forming modified preceramic polymers comprising mixing organopolysilanes having a plurality of Si-H functional groups with an effective amount of a metallocene compound, and allowing the mixture to undergo a dehydrogenative reaction is disclosed. Pyrolysis of the modified polymer provides in high yields ceramic residues that approach stoichiometric SiC in composition. Preferably the organopolysilane starting material contains a plurality of tertiary Si-H bonds and has the general formula of [(RSiH)x(RSi)y]n where the sum of the coefficients x and y equal 1, n is an integer greater than 1, R is a lower alkyl group having from 1 to about 8 carbon atoms, a substituted or unsubstituted lower alkenyl group having from 2 to about 8 carbon atoms, a cycloalkyl group having from 3 to about 10 carbon atoms, substituted or unsubstituted aryl group having from 6 to about 10 carbon atoms. More preferably R is a lower alkyl group having from 1 to about 8 carbon atoms, and still more preferably R is methyl so that the molar ratio of carbon to silicon of the polymer is about 1. The organopolysilanes can be prepared from silyl halides by alkali metal condensation reactions.
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申请公布号 |
US5204380(A) |
申请公布日期 |
1993.04.20 |
申请号 |
US19910751190 |
申请日期 |
1991.08.29 |
申请人 |
MASSACHUSETTS INSTITUTE OF TECHNOLOGY |
发明人 |
SEYFERTH, DIETMAR;TRACY, HENRY J.;ROBISON, JENNIFER L. |
分类号 |
C04B35/571;C08G79/00;C08K5/56;C08L83/16 |
主分类号 |
C04B35/571 |
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