Silicon carbide precursors

Details Silicon carbide precursors Silicon carbide precursors

1986-08-25

1988-10-11

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

501 88, 528 10, 528 43, 556430, C08G 7704

Patent

active

047772344

ABSTRACT:
The present application relates to novel silicon based preceramic polymers useful in the production of silicon carbide reinforcement fibers, and to the novel synthesis procedures by which such polymers and reinforcement fibers may be produced.
These novel polymers are produced by preparing phenyl substituted polyalkylcyclohexasilane compounds, which are then converted to the corresponding halogen substituted compound by reaction with the appropriate ammonium halide and sulfuric acid in a suitable solvent such as benzene, and then polymerizing the substituted cyclohexasilane by reaction with an alkali metal, again in a suitable solvent such as toluene or benzene, to produce polymers of the general formula: ##STR1## wherein R.sub.1 is lower alkyl, preferably methyl or ethyl, R.sub.2 is lower alkyl or hydrogen, m is 0 to 5, n is at least 3. The polymers of the present invention have an average molecular weight of from about 1000 to 100 million or more.

REFERENCES:
patent: 4537942 (1985-08-01), Brown-Wensley et al.
patent: 4590253 (1986-05-01), Hasegawa et al.

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