AROMATIC-POLYETHER-TYPE ION-CONDUCTIVE ULTRAHIGH MOLECULAR WEIGHT POLYMER, INTERMEDIATE THEREFOR, AND PROCESSES FOR PRODUCING THESE

An aromatic-polyether-type ion conductive polymer membrane having improved mechanical strength is provided. An aromatic-polyether-type ion-conductive ultrahigh molecular weight polymer having an ion exchange capacity of 0.1 meq/g or higher and a structure comprising an aromatic-polyether-type ultrahigh molecular weight polymer in which an acid group introduced, said aromatic-polyether-type ultrahigh molecular weight polymer having at least one structural unit selected from those represented by the following formulas (1) and (2) and the sum of the number a of the structural unit of the formula (1) and the number b of the structural unit of the formula (2) being 2 or larger: