Effect of Phase Inversion Temperature on the Formation and Performance of PES/DMF/PVP Polyethersulfone Membranes
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The paper studies the preparation of polymer membranes from 15% polyethersulfone solutions of PES/DMP/5%PVP and PES/DMP/7%PVP compositions using the phase inversion method at different precipitation temperatures. Two groups of polyethersulfone membranes were obtained and precipitation was carried out for each at four temperatures (10℃, 20℃, 30℃, 40℃). The particle sizes and degree of polydispersity in the casting solutions were studied on a Malvern analyzer. The optimal temperature for conducting phase inversion at two different PVP concentrations and the influence of the coagulation bath temperature on the performance, structure, and pore size of the resulting membranes were determined. Membranes precipitated from a solution containing 5% PVP showed better performance and structure than membranes precipitated at 20℃, and membranes precipitated from a solution containing 7% PVP showed better performance and structure than membranes precipitated at 30℃.
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