The ion crosslinking sulfonate polysulfones (Na-PSF, Mg-PSF, Al-PSF) were prepared by sulfonation technology and they were applied to prepare as asymmetric membranes for dehydrating of water/ethanol mixtures by pervaporation. The degree of ion crosslink showed a strongly influence on both of the membrane formation path ways in phase inverse process and the separation performance of pervaporation membranes with different cation crosslinking in casting solution. The cation crosslinking of polysufone enhanced the viscosity of casting solution and formed a denser skin layer during the wet phase inverse process. The swelling and hydrophilic properties measurements found that the water selective membranes can be formed by increased the ion crosslinking in polymer membrane and then the degree of swelling of modified membranes decreased with increasing the cation content in polymer matrix. The effect of water selectivity of ion crosslinking membranes on the water uptake of membranes were verified by the sorption test with 90% ethanol/water mixture at 25℃.
The Eighth Conference on Membrane Science & Technology in Taiwan，起迄日：2008/6/27，地點：中壢