Preparation And Application Of Hydrophilic Polysulfone Membrane

Polysulfone membranes are favored by more and more masses because of its excellent overall performance. However, polysulfone membrane could easily lead to membrane fouling that reduces the separation efficiency and shorten the life of the film due to the poor hydrophilic. In recent years, the hydrophilic polysulfone become a hot research at home and abroad today. The hydrophilic polysulfone is a highly efficient core in the field of water treatment, and is also one of the important ways to improve the separation performance. In this paper, the hydrophilic polysulfone membrane materials are prepared through two routes.The hydrophilic monomer phenolphthalin was synthesized in phenolphthalein through a series of reaction. FT-IR and1 H NMR were used to characterize its structure. The polysulfone membrane material with different hydrophilic were prepared in phenolphthalin(PP), biphenol(BP) and 4,4’-dichloro diphenyl sulfone(DCDPS) by controlling moners’ mole changes.1H NMR were used to characterize their structure. The Relations was studied between the ratio of reactants and the polymerization time, inherent viscosity, thermal properties, and solubility. Through research, we found that, with the increase of phenolphthalin monomer content, the polymerization reaction time is extended, inherent viscosity of polymer is increased, heat resistance decreases slightly, the solubility decreases in some solvent such as DMF.Polysulfone membrane were prepared in the different polysulfone through LS phase inversion method. The Relations was studied between the ratio of phenolphthalin and water contact angle of the film surface, water absorption, dimensional change rate, tensile breaking strength, pure water flux and other properties. We found that, with the increasing of phenolphthalin content, water contact angle decreases; water flux rises first and reduces after, the maximum reaches 260 L·m-2·h-1when the phenolphthalin content is 75%; the dimensional change increased slightly. The phenolphthalin content has no effect on tensile strength and morphology of the membranes.The hydrophilic monomer 3, 3’- disulfonic acid sodium- 4, 4’- dichlorodiphenyl sulfone( SDCDPS) was synthesized in 4, 4’- dichlorodiphenyl sulfone( DCDPS), phosphorus pentoxide( P2O5)and concentrated sulfuric acid( H2SO4). FT-IR and1 H NMR were used to characterize itsstructure. The polysulfone membrane material with different sulfonated degree were prepared in 3, 3’- disulfonic acid sodium- 4, 4’- dichlorodiphenyl sulfone( SDCDPS), biphenol AF(BPAF) and4,4’-dichloro diphenyl sulfone(DCDPS) by controlling moners’ mole changes.1H NMR were used to characterize their structure. The Relations was studied between the sulfonated degree and inherent viscosity, thermal properties, and solubility. Through research, we found that,with the increase of sulfonation degree, inherent viscosity of polymer is increased; heat resistance decreases slightly; the solubility decreases in some solvent such as chloroform.Polysulfone membrane were prepared in the different polysulfone through LS phase inversion method. The Relations was studied between sulfonated degree and water contact angle of the film surface, water absorption, dimensional change rate, tensile breaking strength,pure water flux and other properties. We found that, with the increasing of sulfonated degree,water contact angle decreases; water flux rises first and reduces after, the maximum reaches170 L·m-2·h-1when the sulfonated degree is 5; the dimensional change increased slightly. The sulfonated degree has no effect on tensile strength and morphology of the membranes.