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Sulfonated poly(phthalazinone ether ketone) (SPPEK) membranes were cast from N,N-dimethylacetamide (DMAc) solution and tested for their application as proton exchange membranes (PEMs) in direct methanol fuel cells (DMFCs). The methanol and water swelling uptake and several permeation tests indicated that SPPEK had a lower affinity to methanol than Nafion and was less permeable than Nafion. In a single...
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