| 摘要 |
The present invention provides a membrane-electrode assembly for fuel cell which comprises a solid polymer electrolyte membrane comprising a specific polyarylene having a sulfonic acid group and has excellent creep resistance, power generation performance and durability against power generation under high-temperature environment. The membrane-electrode assembly is characterized in that a pair of electrodes each comprising a gas diffusing layer and a catalyst layer are joined to both sides of a solid polymer electrolyte membrane so that the catalyst layer side comes into contact with the membrane, said membrane comprises a sulfonated polyarylene comprising constituent unit represented by the following formula (1): wherein Y is a group represented by -C(CF<SUB>3</SUB>)<SUB>2</SUB>-, (CF<SUB>2</SUB>)<SUB>i</SUB>-, wherein i is an integer of 1 to 10, -SO- or -SO<SUB>2</SUB>-; Z is a divalent electron-donating group or a direct bond; Ar is an aromatic group having a substituent represented by -SO<SUB>3</SUB>H; m is an integer of 0 to 10; n is an integer of 0 to 10; and k is an integer of 1 to 4.
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