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>> Multi-block sulfonated poly (arylene ether sulfone) (SPES) membranes were synthesized by post-sulfonationand its properties characterized. Two types of oligomers, F-terminated and OH-terminated telechelic oligomers, were synthesized by controlling the feed ratio of dihydroxyl- and difluoro-monomers. Their number of repeating unit (X and Y) was analyzed by GPC and 1 H NMR. Copolymerization with F-terminated and OH-terminated telechelic oligomers via nucleophilic aromatic substitution, gave high-molecular-weight multi-block PESs. Each blocklength was controlled to have different values with X5Y10, X10Y10, X20Y10 and X20Y20. Successful polymerizationand its successful sulfonation was confirmed by GPC and 1 H NMR. RH dependence of proton conductivity of multi-block SPES membranes was comparable to that of Nafion 212 at high RH conditions. Key words : PEMFC(), Electrolyte membrane(), Poly(arylene ether sulfone, ), Proton conductivity(), Sulfonation()

Synthesis and Characterization of Sulfonated Poly (Arylene ether Sulfone) Multi-Block Copolymer for PEMFC Application