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In this report, we demonstrate a simple preparation of the partially sulfonated poly(styrene-b-butadiene-b-styrene) (sSBS), casting and photocrosslinking of tough films which can be used as a proton exchange membrane (PEM) for direct methanol fuel cell (DMFC). Upon reaction with acetylsulfate in a homogeneous solution phase, SBS was converted to sSBS with a degree of sulfonation (DS) in a controlled...
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