| 摘要 |
Provided are a polymer electrolyte membrane for a fuel cell, a membrane electrode assembly containing the electrolyte membrane which is excellent in phosphoric acid infiltration, is high in the ion conductivity even under the condition of high temperature and no moisture and is minimized in the deterioration of durability due to the CO poisoning of an electrode, and a fuel cell containing the assembly. The polymer electrolyte membrane comprises a polyimide copolymer film represented by the formula 1; and an acid infiltrated in the polyimide copolymer film, wherein A and P are an acid dianhydride; B is a divalent organic group derived from diaminophenylbenzimidazole represented by the formula 2; and D is a divalent organic group selected from an aromatic diamine. The membrane electrode assembly comprises the polymer electrolyte membrane; a catalyst layer coated on the both sides of the polymer electrolyte membrane by vapor deposition; and a gas diffusion layer located on the both sides of the catalyst layer. |
