Peroxide-substituted polysilazanes

Details Peroxide-substituted polysilazanes Peroxide-substituted polysilazanes

1993-02-16

1994-09-06

Marquis, Melvyn I.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

501 92, 528 24, 528 25, 528 33, 528 38, C08K 334

Patent

active

053449070

ABSTRACT:
An uncrosslinked polysilazane containing chemically bound peroxide groups is prepared by reacting a polysilazane and a hydroperoxide at a temperature below the decomposition temperature of the hydroperoxide. A thermoset polymer is formed by heating an uncrosslinked, peroxide-substituted silazane that is also substituted by alkenyl or alkynyl groups at temperatures sufficiently high to decompose the chemically bound peroxide groups to yield a free radical, thereby initiating crosslinking. The crosslinked polysilazanes can be pyrolyzed to form ceramic articles.

REFERENCES:
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patent: 3843703 (1974-10-01), Ostrozynski
patent: 4482669 (1984-11-01), Seyferth et al.
patent: 4722988 (1988-02-01), Porte et al.
patent: 4772494 (1988-09-01), Porte et al.
patent: 4929704 (1990-05-01), Schwark
patent: 5021533 (1991-06-01), Schwark
Kazakova, V. V. et al., Chemical Properties of Organooligocyclosilazanes, Poly. Sci. U.S.S.R., vol. 26, No. 8, pp. 1889-1897 (1984).

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