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The structure of the styrene grafted and sulfonated poly(vinylidenefluoride-co-hexafluoropropylene) was studied by small angle x-ray scattering, SAXS. The starting material is lamellar and the grafting and sulfonation processes and the hexafluoropropylene, HFP, contents affected the lamellar period. The SAXS intensity curve of the sulfonated membranes also included an ionic peak which arises from the ionic aggregates. The effects of the humidy and metal ion neutralization on the ionic aggregates were studied.
