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Poly(amide-6-b-ethylene oxide)(Pebax1657)/1-butyl-3-methylimidazo-lium bis[trifluoromethyl)sulfonyl]-imide([Bmim][Tf_2N]) blend membranes with different [Bmim][Tf_2N] contents were prepared via solution casting and solvent evaporation method. The permeati