SOLID POLYMER ELECTROLYTE MEMBRANE, METHOD FOR PRODUCING SAME, AND SOLID POLYMER FUEL CELL

摘要

A low-cost solid polymer electrolyte membrane for solid polymer fuel cells having heat resistance and excellent proton conductivity even under low moisture conditions can be produced by a simple chemical synthesis process using a low-cost raw material. Specifically disclosed is a solid polymer electrolyte membrane for solid polymer fuel cells which is mainly composed of a hyperbranched polymer having an acidic functional group such as a sulfonic acid group at the end of a side chain. Examples of such a hyperbranched polymer may include poly[bis(oligo-ethylene glycol)benzoate].