| abstract |
To provide a solid polymer electrolyte made of a polymer having a sulfonic acid group with improved hot water resistance and radical resistance (durability), and a proton conducting membrane made of the electrolyte. A polymer electrolyte according to the present invention comprises a polymer having a structural unit having a specific sulfonic acid group and a structural unit represented by the following chemical formula. [Chemical 1] (Wherein R 1 to R 8 may be the same or different from each other, and at least one selected from the group consisting of a hydrogen atom, a fluorine atom, an alkyl group, a fluorine-substituted alkyl group, an allyl group, an aryl group, and a cyano group) A seed atom or group, W represents a divalent electron-withdrawing group or single bond, T represents a divalent organic group or single bond, and p represents 0 or a positive integer.) [Selection figure] None |