Abstract
A series of poly(methylisatin biphenylene) were prepared by superacid-catalyzed polyhydroxyalkylation reaction of N-methyl isatin, 2,2′-dihydroxybiphenyl and diphenyl ether. These polymers have some ether linkages on polymer backbone that render softness and make more elastic. And sulfonic acid groups were introduced by sulfonation reaction with potassium-3-bromopropane sulfonic acid. Their sulfonic acid groups with functionalization and the measurement of apposite parameters for proton exchange membranes (PEMs) were described. The membranes showed comparable IEC (1.59–1.98 meq./g), water uptake (32.72–57.30%), proton conductivity (72.1–109.2 mS/cm), and high thermal stability, and also proton conductivity measurement compared with Nafion 211®.
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