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Carboranylcyclotriphosphazenes and their polymers

Author
Obrien, J. P.
Published
Sep 8, 1981.
Physical Description
1 electronic document
Additional Creators
Allcock, H. R., Fewell, L. L., and Scopelianos, A. G.
Online Version

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Summary
Carboranyl-substituted polyphosphazenes are prepared by heat polymerizing a carboranyl halocyclophosphazene at 250 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 CF3CH2O. 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.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19820010515.
Accession ID: 82N18389.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15971966