Patent ID: 8951694
Filing Date: 2015-02-10
Classification: C08J,H01M,Y02E,Y02P

Abstract:
1. A method of preparing a membrane to be assembled in a membrane electrode assembly, the method which comprises: a) irradiating a base polymer film with radiation selected from the group consisting of electromagnetic radiation and particle radiation in order to form reactive centers (i.e. radicals) within the base polymer film; b) exposing the irradiated base polymer film to a mixture of monomers amenable to radiation-induced graft polymerization comprising styrene and methacrylonitrile to induce a formation of a graft copolymer in the irradiated base polymer film and to form a grafted base polymer film; and c) sulfonating the grafted base polymer film to introduce sulfonic acid sites providing ionic conductivity of the material.