Abstract
A series of modified anion conductive block poly(arylene ether sulfone) copolymer membranes containing a selective substituted unit, 15%, 20% and 25% 4,4′-(2,2-diphenylethenylidene) diphenol, were prepared for use in alkaline fuel cells. The anion exchange membranes were synthesized by first introducing chloromethyl groups. Quaternary ammonium groups could then be added to the tetra-phenyl ethylene units, followed by subsequent ion exchange. The tetra quaternary ammonium hydroxide polymers showed high molecular weights and exhibited high solubility in polar aprotic solvents. The block copolymer membrane showed higher ionic conductivity (21.37 mS cm−1) than the random polymer membrane of similar composition (17.91 mS cm−1). The membranes showed good chemical stability in 1.0 M KOH solution at 60 °C. They were characterized by 1H NMR, FT-IR, TGA and measurements of ion exchange capacity, water uptake and ionic conductivity.
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