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Water uptake and permselectivity were measured for five sulfonated poly(ether sulfone) cation exchange membranes with varying degrees of functionalization from 20% to 60%. Experiments were conducted in aqueous salt solutions of LiCl, NaCl, KCl, Li2SO4, Na2SO4 and K2SO4 to isolate the effect of counter-ions and co-ions on membrane permselectivity. Water uptake ranged from 0.13gwater/gpolymer to 0.76gwater/gpolymer...
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