Polymer Electrolyte, Membrane Electrode Assembly and Fuel Cell

Abstract

The present invention easily provides a polymer electrolyte that exhibits high proton conductivity under low humidity conditions and has a high level of durability and mechanical strength. The polymer electrolyte is produced by mixing proton-conducting sulfonated polyethersulfone C1, sulfonated polyphenylene sulfide C2 or sulfonated poly(4-phenoxybenzoyl-1,4-phenylene) C3 having a sulfonic acid group A as a protic acid group with 1,4-benzenedimethanol B as a crosslinking agent having a methylol group and heat-treating the mixture so that a reaction can be carried out. The polymer electrolyte includes a plurality of proton-conducting sulfonated polyethersulfone moieties C chemically bonded at their aromatic ring moieties other than the sulfonic acid group A to one another through a residue B′ of 1,4-benzenedimethanol.

Dependencies are inferred from the claim text.