ION EXCHANGE MEMBRANE FOR DIRECT TYPE METHANOL FUEL CELL

摘要

PURPOSE: Provided is an ion exchange membrane excellent in conductivity and durability, which is a flexible thin membrane and can be used for an electrolyte for a direct type methanol fuel cell. CONSTITUTION: The ion exchange membrane comprises the product of the sulfonation of styrene-ethylene/butylene-styrene terpolymer having a repeating unit of the formula (I) and a repeating unit of the formula (II) or (III), wherein the terpolymer has a molecular weight of 50,000-300,000 and the ratio of styrene is more than 50% based on the total monomers. And the thickness of the ion exchange membrane is 0.08-0.50mm.