Abstract: A polymeric membrane composed of a homogenous mixture of (1) a hydrophilic esin which is (a) partially acetylated cellulose in which from about 50 to less than 100 percent of the hydroxyl groups are acetylated, (b) polyvinyl acetate, (c) hexadimethrine bromide, or mixtures thereof, and (2) a polyphenylquinoxaline of the formula ##STR1## WHEREIN X IS A DIRECT BOND, ##STR2## and Ar is m-phenylene, p-phenylene, or ##STR3## wherein z is a direct bond, ##STR4## and wherein n is a value such that the polyphenylquinoxaline has an inherent viscosity of from about 0.5 to about 2.5 dl./g as a 0.5 g in 100 ml solution in 98 percent sulfuric acid at about 30.degree. C. These polymeric membranes are used as separators in alkaline cells such as silver-zinc cells.

Abstract: High molecular weight polyphenylamide-quinoxalines comprised essentially of nits of the formula ##STR1## or mixtures thereof, are prepared by heating bifunctional monomers of the formula ##STR2## or mixtures thereof, wherein R is COCH.sub.3 or --H to a temperature above the melting point of the monomer but below the decomposition temperature of the polyphenylamide -quinoxaline (Ca. 475-490.degree. C). This melt polymerization of the bifunctional monomers produces strong, low void adhesive joints.