Patent ID: 8309678

Claim:
A polyarylene copolymer having a sulfonic acid group, the polyarylene copolymer comprising a repeating unit represented by formula (2): wherein Y is at least one structure selected from the group consisting of —CO—, —SO 2 —, —SO—, —CONH—, —COO—, —(CF 2 ) l — (l is an integer of 1 to 10), and —C(CF 3 ) 2 —; W is at least one structure selected from the group consisting of a direct bond, —CO—, —SO 2 —, —SO—, —CONH—, —COO—, —(CF 2 ) l — (l is an integer of 1 to 10), —C(CF 3 ) 2 —, —O—, and —S—; Z is a direct bond or at least one structure selected from the group consisting of —(CH 2 ) l — (l is an integer of 1 to 10), —C(CH 3 ) 2 —, —O—, —S—, —CO—, and —SO 2 —; R 30 is a nitrogen-containing heterocycle having at least one substituent selected from the group consisting of —SO 3 H, —O(CH 2 ) h SO 3 H, and —O(CF 2 ) h SO 3 H (h is an integer of 1 to 12), wherein the nitrogen-containing heterocycle is selected from the group consisting of pyrrole, thiazole, isothiazole, oxazole, isoxazole, imidazole, imidazoline, imidazolidine, pyrazole, 1,3,5-triazine, pyridine, pyrimidine, pyridazine, pyrazine, indole, quinoline, isoquinoline, burine, tetrazole, tetrazine, triazole, carbazole, acridine, quinoxaline, quinazoline, indolizine, isoindole, 3H-indole, 2H-pyrrole, 1H-indazole, purine, phthalazine, naphthyridine, cinnoline, pteridine, carboline, phenanthridine, perimidine, phenanthroline, phenazine, phenarsazine, phenothiazine, furazan, phenoxazine, pyrrolidine, pyrroline, pyrazoline, pyrazolidine, piperidine, piperazine, indoline, isoindoline, and quinuclidine; p is an integer of 0 to 10; q is an integer of 0 to 10; r is an integer of 1 to 5; and k is an integer of 0 to 4; the polyarylene copolymer further comprising a structure represented by Formula (3): wherein each A and C independently denotes a direct bond or at least one structure selected from the group consisting of —CO—, —SO 2 —, —SO—, —CONH—, —COO—, —(CF 2 ) 1 — (l is an integer of 1 to 10), —C(CF 3 ) 2 —, —(CH 2 ) l — (l is an integer of 1 to 10), —C(CR′ 2 ) 2 — (R′ is a hydrocarbon group or a cyclic hydrocarbon group), —O—, and —S—; each B independently denotes an oxygen atom or a sulfur atom; R 1 to R 16 may be the same or different from one another and each denote at least one atom or group selected from the group consisting of hydrogen atoms, fluorine atoms, alkyl groups, halogenated alkyl groups that are partially or fully halogenated, allyl groups, aryl groups, nitro groups, and nitrile groups; s and t each denote an integer of 0 to 4; and u denotes 0 or an integer of 1 or more.