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Proton exchange membranes were synthesized from the Polyvinyl Alcohol copolymer (PVA) crosslinked with potassium hydroxide (KOH) and formaldehyde (CH2O), and loaded with vanadium pentoxide in amounts of 0.5%, 1.0% and 1.5% to evaluate their application in fuel cells. The physicochemical and mechanical properties of the membranes were characterized. The results show that the membrane loaded at 1.5% presented the highest ion exchange capacity (1.1 meq/g) and a very good water retention, due todoi:10.12988/ces.2017.711195 fatcat:whw7fua4obha5b66dstc22eigy