Polymer electrolyte membrane, membrane-electrode assembly for polymer electrolyte fuel cells and process for producing polymer electrolyte membrane

摘要

A polymer electrolyte membrane comprises at least one layer of a perforated sheet having many through-holes formed substantially parallel to the thickness direction with an average cross-sectional area per hole ranging from 1x10^-3 to 20 mm², wherein the numerical aperture based on the through-holes ranges from 30 to 80%, and the through-holes are filled with an ion exchange resin.