Kang, JS Won, J Park, HC Kim, UY Kang, YS Lee, YM 2024-01-21T14:05:22Z 2024-01-21T14:05:22Z 2021-09-05 2000-05-01 0376-7388 https://pubs.kist.re.kr/handle/201004/141389 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. English ELSEVIER SCIENCE BV GAS SORPTION PERMSELECTIVITY SEPARATION MACROVOIDS TRANSPORT Morphology control of asymmetric membranes by UV irradiation on polyimide dope solution Article 10.1016/S0376-7388(99)00340-3 1 JOURNAL OF MEMBRANE SCIENCE, v.169, no.2, pp.229 - 235 JOURNAL OF MEMBRANE SCIENCE 169 2 229 235 scie scopus 000086199200006 2-s2.0-0005336506 Engineering, Chemical Polymer Science Engineering Polymer Science Article GAS SORPTION PERMSELECTIVITY SEPARATION MACROVOIDS TRANSPORT polyimide membrane phase inversion UV irradiation chemical gelation