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Integrally skinned asymmetric polysulfone membranes were prepared from originally dense films inducing asymmetry by the formation of the porous layer adding to one side of the membranes chloroform and supercritical CO 2 (SCCO 2 ), and then allowing the SCCO 2 expansion to occur. The influence of the chloroform/polysulfone mass ratio (g CH 3 Cl/g PSF), SCCO 2 ...
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