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[摘要]：Polymer electrolyte membranes based on cross-linked highly sulfonated multiblock copoly(ether sulfone)s (IEC = 2 99-3 40 mequiv/g) were prepared successfully by the reaction between the sulfonic acid groups in the main chains and 1,4-diphenoxybenzene as a cross-linker in the presence of the condensation agent The HSPx1-3 membranes, which represent the cross-linked HSPI-3 membranes, demonstrated good mechanical strength in the dry state regardless of their high IEC values and the introduction oldie cross-linking structure e Additionally, the multiblock polymer and the cross-linking structure suppressed unacceptable water uptake and dimensional change of the HSPx1-3 membranes even in the hydrated state, while maintaining relatively high water uptake under low relative humidity (10 3-17.6 wt % at 30% RI-I) due to then high IEC values. The HSPx1-3 membranes showed higher proton conductivity than that of Nafion 117 in the range of 30-95% RH (at 80 degrees C) Especially, the HSPx3 membrane with the highest IEC value (3 40 mequrv/g) showed 2 4-3 6 times higher proton conductivity compared to Nation 117 in the whole range of 30-95% RH and still maintained excellent proton conductivity of 1 0 x 10(-2) S/cm even at 80 degrees C and 30% RH |
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