Sulfonation levels is aroung 40 mol%. 1:1 mixture of n-heptane and cyclohexane does not dissolve these pentablock membranes.
Antonio Buonerba
I think that you can try: 1) neat DMAc; 2) TCE/DMSO (v/v = 1/1). First swell the polymer at rt and than increase slowly the temperature with a vigorous stirring.
See also:
Article Novel Synthetic Strategy for the Sulfonation of Polybutadien...
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