Perfluoropolymer, liquid composition, solid polymer electrolyte membrane, membrane electrode assembly and solid polymer fuel cell

摘要

A perfluoropolymer capable of producing an electrolyte membrane excellent in mechanical strength under conductive and high-temperature environments, and a liquid composition, a solid polymer electrolyte membrane, a membrane electrode assembly and a solid polymer fuel cell obtained by using the same.Perfluoropolymers of the present inventionContains perfluoromonomer unitsSubstantially no unit containing halogen atoms other than fluorine atomsSubstantially no unit of ring structureA perfluoropolymer having an acid type sulfonic acid groupPerfluoromonomer unitContains at least one unit a selected from the group consisting of a perfluorovinyl ether unit and a perfluoroallyl ether unitThe ion exchange capacity is 1.4 to 2.5 millimeter equivalent / gram drying resin.Storage modulus at 120 ℃ is above 60 MPa.