| abstract |
To provide a polymer electrolyte for a direct methanol fuel cell electrode having high proton conductivity and improved methanol resistance, a varnish composition for a direct methanol fuel cell electrode, and a direct methanol fuel cell. A polymer electrolyte for a direct methanol fuel cell electrode contains a polyarylene containing a repeating structural unit represented by the formula (A) and a repeating structural unit represented by the formula (B); [Chemical 1] (In the formula (A), X is a single bond, an electron withdrawing group, an electron donating group, m is 0 to 10, k is 0 to 5, l is 0 to 4, k + l ≧ 1, and R 1 in the formula (B). ˜R 8 is a hydrogen atom, a fluorine atom, an alkyl group, W is a divalent electron withdrawing group, a single bond, T is a single bond, a divalent electron withdrawing group, a divalent electron donating group, a formula ( C-1) and a divalent group represented by (C-2), n is a positive integer, R 9 in formulas (C-1) and (C-2) ˜R 20 is a hydrogen atom, a fluorine atom, an alkyl group, etc., Q is a single bond, a divalent electron donating group, J is a single bond, an alkylene group, —O—, —CO—, —COO— or the like. ). [Selection figure] None |