High char yield silazane derived preceramic polymers and cured c

Details High char yield silazane derived preceramic polymers and cured c High char yield silazane derived preceramic polymers and cured c

1989-12-08

1992-08-04

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 23, 528 24, 528 32, 528 33, C08G 7706

Patent

active

051360071

ABSTRACT:
Novel polysiloxane-silazane preceramic polymer compositions are prepared by the controlled hydrolysis polymerization of a trimer or tetramer of a monomer of the structure ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are independently alkyl groups containing from 1 to 4 carbon atoms, R.sup.a, R.sup.b, R.sup.c, and R.sup.d are independently alkenyl or alkyl groups containing from 2 to 6 carbon atoms with the proviso that at least one of R.sup.a, R.sup.b, R.sup.c, or R.sup.d group is an alkenyl group. The polysiloxane-silazane polymers are cured by heat and optionally free radical initiators such as various peroxides. The cured preceramic polymers so formed can be u sed in the pyrolyzed or non-pyrolyzed state as adhesives, coatings, binders, fibers, matrix resins, and the like.

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Effects of Molecular Weight and Cross-Linking on Two Preceramic Polymers by Wm. Toreki and Christopher D. Batich.

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