| http://www.w3.org/ns/prov#value | - Therefore, in the polymer ion-exchange membrane of the invention, as long as the film substrate is impermeable to methanol, the movement of hydrogen ions occurs only through those graft chains within the pores, or in the regions damaged by ion irradiation, which were converted to sulfonic acid groups, so the swelling that occurs in the membrane due to methanol and other alcohols is hardly recogniz
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