期刊
JOURNAL OF MEMBRANE SCIENCE
卷 169, 期 2, 页码 229-235出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0376-7388(99)00340-3
关键词
polyimide membrane; phase inversion; UV irradiation; chemical gelation
The membrane morphology was readily controlled by the gelation of dope solution before immersion into a coagulation medium. In particular, macrovoid-free, sponge-like integrally skinned asymmetric polyimide membranes with improved selectivity were obtained by the chemical gelation of cast solution film. Cross-linking was performed by ultraviolet irradiation for benzophenone containing polyimide dope solution. Cross-linking maintained the structure of cast solution him until the moment of immersion into a nonsolvent bath. Macrovoid decreases with irradiation time on the cast solution Blm. Sponge-like integrally skinned asymmetric membranes were obtained with sufficient irradiation. Gas permselectivity increased significantly with the progress of cross-linking on the cast solution him. Membrane morphology and subsequent transport properties can be controlled both by the extent of cross-linking and by the concentration of dope solution, (C) 2000 Elsevier Science B.V. All rights reserved.
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