Abstract
Densely sulfonated poly(fluorenyl ether sulfone) block copolymers (DS-PFESs) of various hydrophilic and hydrophobic oligomer block lengths were prepared, and the effect of the block length on the membranes' physicochemical and electrical properties was systematically investigated. Although the conductivity increased with the block length, a morphological analysis identified an optimal chain length. Further increases in the chain length resulted in the formation of larger ionic cluster clumps that caused a significant loss in the phase separation and, hence the dimensional/mechanical stability. The DS-9-32 membrane, prepared with a hydrophilic and hydrophobic block length of 9:32, displayed a well-balanced hydrophilic/hydrophobic phase separation and a high conductivity, together with a high dimensional/mechanical stability.
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