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(a) Cross-sectional morphology of sPAEK 1:Nafion® = 2:1 by scanning electron microscopy (SEM) and Energy-dispersive X-ray analysis (EDAX); (b) Cross-sectional morphology of sPAEK 1:sPAEK 3 = 2:1 by SEM and EDAX; (c) Summary of proton conductivity and methanol permeability of blend membranes. Reproduced with permission from [55]. Copyright Elsevier, 2008.
