Poly(aryloxyphosphazene) Foams and Wire Coverings.

摘要

A new family of polymers based on the phosphorus-nitrogen backbone,the poly(aryloxyphosphazenes),is being investigated as fire-resistant materials to replace existing materials. Efforts were devoted to synthesis of (C6H5O2PN-4-C2H5C6H4O)2PN)n and evaluation of methods for formation of expanded closed cell foams of low density. Vulcanizates (unexpanded) were found to possess adequate tensile strength and elongation. Studies of the poly(aryloxyphosphazene) foams for use as thermal insulation showed improvement in times to vision obscuration. Little generation of toxic or corrosive products upon burning of the poly(aryloxyphosphazene) was found. Foams have been produced by the use of chemical blowing agents and molding and curing under controlled pressure at temperature. (Modified author abstract)