PROCESS FOR PRODUCING POLYMERIC FILMS FOR USE AS FUEL CELLS

摘要

PURPOSE: A method for producing films for use as polymer electrolytes in fuel cell applications is provided. CONSTITUTION: A method for producing a polymeric film suitable for use an electrolyte comprises the steps of: a) forming a porous membrane by coagulating a polymer dope solution, said solution comprising a polymer dissolved in a selected solvent, in a liquid coagulation bath comprising a non-solvent; b) submerging the resulting membrane into a non-solvent bath to remove any residual solvent; c) placing said membrane into an acid solution in a non-solvent, whereby the pores become filled with the acid solution; d) drying the membrane to remove residual non-solvent, which collapses the porous structure entrapping the acid and forming a dense film.