Morphology control of asymmetric membranes by UV irradiation on polyimide dope solution

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 f...

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Bibliographic Details
Published inJournal of membrane science Vol. 169; no. 2; pp. 229 - 235
Main Authors Kang, Jong Suk, Won, Jongok, Park, Hyun Chae, Kim, Un Young, Kang, Yong Soo, Lee, Young Moo
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2000
Subjects
Chemical gelation
Phase inversion
Polyimide membrane
UV irradiation
Phase inversion
Polyimide membrane
UV irradiation
Chemical gelation
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Summary: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 film until the moment of immersion into a nonsolvent bath. Macrovoid decreases with irradiation time on the cast solution film. 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 film. Membrane morphology and subsequent transport properties can be controlled both by the extent of cross-linking and by the concentration of dope solution.
ISSN:0376-7388
1873-3123
DOI:10.1016/S0376-7388(99)00340-3