| abstract |
PROBLEM TO BE SOLVED: To improve mechanical properties such as tensile strength, elongation at break, elastic modulus and chemical resistance as compared with a membrane comprising only a sulfonated aromatic polymer without impairing proton conductivity. A proton conducting material). SOLUTION: (A) Sulfonated aromatic polymer 100 (B) 3 to 40 parts by weight of a sulfonated product of hydrogenated conjugated diene-aromatic vinyl copolymer, and (C) A sulfonated polymer composition containing a required amount of an organic solvent as a main component, and a film obtained by casting and drying the composition. |