.ALPHA.,.BETA.,.BETA.-TRIFLUOROSTYRENE-BASED AND SUBSTITUTED.ALPHA.,.BETA.,.BETA.-TRIFLUOROSTYRENE-BASED COMPOSITE MEMBRANES

摘要

A composite membrane is provided in which a porous substrate is impregnated with a polymeric composition comprising various combinations of .alpha.,.beta.,.beta.-trifluorostyrene, substituted .alpha.,.beta.,.beta.- trifluorostyrene and ethylene-based monomeric units. Where the polymeric composition includes ion-exchange moieties, the resultant composite membrane s are useful in electrochemical applications, particularly as membrane electrolytes in electrochemical fuel cells.