A particularly important category of ion exchange polymers is the perfluorocarbon type made by DuPont under the trade name Nafion [17,18]. The base polymer is made by polymerization of a sulfinol fluoride vinyl ether with tetrafluoroethylene. The copolymer formed is extruded as a film about 120 µm thick, after which the sulfinol fluoride groups are hydrolyzed to form sulfonic acidgroups:
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