WEAKLY CATIONIC ION-EXCHANGE MEMBRANE AND ITS PREPARATION

摘要

PURPOSE:The titled economic film obtained in a short irradiation time without causing homopolymerization and deterioration of TFS, by hydroxylating, carboxylating, and phosphorylating (or converting into a phosphorous ester) a polymer film comprising an inert polymer film having TFS a graft chain. CONSTITUTION:A benzene ring of a graft polymer comprising an inert polymer film having alpha,beta,beta-trifluorostyrene (TFS) as a graft chain is at least partially replaced one of hydroxyl group, carboxyl group, phosphate group and phosphite group. The graft polymer film is obtained by irradiating an inert polymer film with ionizing radiation, immersing it in TFS or bringing it into contact with TFS to carry out graft polymerization, hydroxylating it, etc. A polyethylene- polytetrafluoroethylene copolymer film, etc. is used as the inert polymer film.