To provide a proton-conductive block copolymer used for fuel cells satisfying both of the water resistance and the high proton conductivity over a long period, its crosslinked product and a proton-conductive film using those, and a fuel cell using the film.
The present invention provides a proton-conductive block copolymer in which the product of proton conductivity (26%RH, 80°C) with ion exchange group equivalent (EW=polymer molecular weight/protonic acid group amount) is ≥0.1, a proton-conductive block copolymer having recurring structure units with a specific structure, crosslinked products of these proton-conductive block copolymers and further provides a proton-conductive film using the proton-conductive block copolymer and its crosslinked product, and a fuel cell.
ONOMI TAKEHIKO
INOUE KOJI
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