Carboranylcyclotriphosphazenes and their polymers

Details Carboranylcyclotriphosphazenes and their polymers Carboranylcyclotriphosphazenes and their polymers

1980-03-12

1981-09-08

Briggs, Sr., Wilbert J.

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

Synthetic resins

From boron reactant having at least one boron to hydrogen or...

528168, 528 6, 528 7, 568 2, 568 4, 568 5, 528399, C08G 7300, C08G 7902

Patent

active

042885850

ABSTRACT:
Carboranyl-substituted polyphosphazenes are prepared by heat polymerizing a carboranyl halocyclophosphazene at 250.degree. C. for about 120 hours in the absence of oxygen and moisture. The cyclophosphazene is obtained by allowing a lithium carborane, e.g. the reaction product of methyl-o-carborane with n-butyllithium in ethyl ether, to react with e.g. hexachlorocyclotriphosphazene at ambient temperatures and in anhydrous conditions. For greater stability in the presence of moisture, the chlorine substituents of the polymer are then replaced by aryloxy or alkoxy groups, such as CF.sub.3 CH.sub.2 O--.
The new substantially inorganic polymers are thermally stable materials which produce a high char yield when exposed to extreme temperatures, and can thus serve to insulate less heat and fire resistant substances.

REFERENCES:
patent: 3155630 (1964-11-01), Schroeder
patent: 3164556 (1965-01-01), Apley et al.
patent: 3320185 (1967-05-01), Alexander et al.
patent: 3549604 (1970-12-01), Semenuk et al.

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