Role of a Polymer Additive in Casting Solution in Preparation of Phase Inversion Polysulfone Membranes

摘要: Polymeric membranes were prepared from homogeneous solutions of two different mixtures: polysulfone (PSF)/dimethylformamide (DMF) and PSF/polyvinylpyrrolidone (PVP)/DMF. PSF 15 wt%, after cast on glass plates, solidified either by direct immersion into distilled water or 5-hr exposure under an environment 72.5% relative humidity followed in a bath. The are compared to each other morphological functional characteristics. In the vapor process, demixing rate solution film is enhanced with addition polymer additive, PVP, casting solution. However, enhancement did not result increase permeability significant morphology variation membranes. On contrary, when coagulated bath, PVP worked as flux enhancer. It concluded that at specific concentration wt% polymer, induces solution, which results membranes, only if coagulation carried out nonequilibrium state.