Isocyanate- and isothiocyanate-modified polysilazane ceramic...

Details Isocyanate- and isothiocyanate-modified polysilazane ceramic... Isocyanate- and isothiocyanate-modified polysilazane ceramic...

C - Chemistry, Metallurgy

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C08G 77/62 (2006.01) C04B 35/58 (2006.01) C04B 35/589 (2006.01) C08G 18/04 (2006.01) C08G 18/38 (2006.01) C08G 77/06 (2006.01)

Patent

CA 1339229

Polysilazane addition polymers are prepared by (1) reacting ammonia with one or more halogenated organic silicon compounds to produce a cyclic silazane ammonolysis product and (2) reacting the ammonolysis product with from 0.1% to 30% by weight of an isocyanate, isothiocyanate, ketene, thioketene, carbodiimide, or carbon disulfide. Polysilazane addition polymers containing alkenyl or alkynyl groups can be cured by supplying energy to generate free radicals. The cured or uncured polymers can be pyrolyzed to produce silicon nitride-containing ceramic materials.

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