SEPARATION MEMBRANE FOR FUEL CELL

摘要

Disclosed an anion-exchange separation membrane used for a direct liquid fuel cell, which has high heat resistance and is hardly deteriorated during use. This separation membrane enables a fuel cell to have high output power. Specifically disclosed is a separation membrane for fuel cells, which is composed of a composite membrane obtained by using, as a base, a porous membrane made of a hydrolysis-resistant polyimide resin such as a polyimide resin having a fluorenylidene group in the main skeleton, and filling the pores of the porous membrane with an anion-exchange resin such as a crosslinked hydrocarbon anion-exchange resin having a quaternary ammonium group as an anion-exchange group. Before filling the pores with an anion-exchange resin, water retainability of the porous membrane is increased, if necessary, by having a water-retainable resin adhere to at least a part of the porous membrane surface.