摘要 |
To provide an electrolyte polymer for fuel cells, an electrolyte membrane, a membrane/electrode assembly for fuel cells excellent in the durability. An electrolyte polymer for fuel cells made of a perfluorocarbon polymer having ion exchange groups (which may contain etheric oxygen atoms), characterized in that the value calculated by dividing an absorption area S<SUB>CH </SUB>derived mainly from a C-H bond in the range of from 3,100 cm<SUP>-1 </SUP>to 2,800 cm<SUP>-1 </SUP>by an absorption area S<SUB>CF </SUB>derived mainly from a C-F bond in the range of from 2,700 cm<SUP>-1 </SUP>to 2,000 cm<SUP>-1</SUP>, as measured by means of infrared spectrophotometry, is less than 0.005, an electrolyte membrane and a membrane/electrode assembly. |