Abstract
The swelling processes of an annealed poly(vinyl alcohol) membrane, a NaOH-crosslinked poly(vinyl alcohol) membrane, a poly(vinyl alcohol)-N,N′-methylene bisacrylamide irradiation-crosslinked membrane and a poly(vinyl alcohol)/poly (AMcoAANa) blend membrane were investigated. Water was preferentially sorbed by all four membranes. The selective sorption factor α s and the selective diffusion factor α d were defined, and were used to characterize the effects of sorption and diffusion on selectivity. The results have shown that preferential sorption has a marked effect on selectivity. The mean diffusion coefficients and pervaporation properties of the four membranes are also discussed.
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