Study on the Kinetics of Surface Migration of Surface Modifying Macromolecules in Membrane Preparation

摘要: Surface modifying macromolecules (SMM) were synthesized and blended into the casting solution of poly(ether sulfone). The was cast to films with thickness 0.12 0.24 mm. placed in an oven forced air circulation for periods 3, 5, 7, 2000 min remove solvent, before being immersed water at 4 °C gelation. membranes so prepared further dried subjected contact angle measurement XPS (X-ray photoelectron spectroscopy) analysis. It found that increased as solvent evaporation period increased. increase faster when membrane thinner. According analysis, after initial time lag surface fluorine content finally leveled off. also A kinetic model established SMM migration.