Acid type sulfonic acid containing polymer, liquid composition, solid polymer electrolyte membrane, membrane electrode assembly, solid polymer fuel cell and ion exchange membrane for water electrolysis

摘要

A polymer having an acid type sulfonic acid group which is excellent in hydrogen gas barrier and heat resistance, and has little amount of oligomers generated during production, a liquid composition containing the same and a membrane polymer assembly having a solid polymer electrolyte membrane and a solid polymer fuel cell.Having a perfluoromonomer unitNo monomer units having halogen atoms other than fluorine atomsA polymer having an acid type sulfonic acid groupThe hydrogen gas permeation coefficient in the temperature of 80 ℃ and relative humidity × 10 - 9 cm 3 cm / cm (sThe mass reduction rate is 15 mass% or less when immersed in hot water at 120 ℃ for 24 hours.A precursor of a polymer having the acid type sulfonic acid group;The volumetric flow rate of the polymer having a fluorosulfonyl group isAcid type sulfonic acid containing polymer.