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Preparation of soluble polyimides and ultrafiltration membrane performances

✍ Scribed by I. C. Kim; J. H. Kim; K. H. Lee; T. M. Tak

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 294 KB
Volume: 75
Category: Article
ISSN: 0021-8995
DOI: 10.1002/(sici)1097-4628(20000103)75:1<1::aid-app1>3.0.co;2-b

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✦ Synopsis

Various soluble polyimides with bis[4-(3-aminophenoxy)phenyl]sulfone and three kinds of dianhydrides were prepared in a polar N-methyl-2-pyrrolidone solvent by the traditional chemical two-step method. All the polymers synthesized had good solubilities in polar solvents and excellent thermal properties. Wide-angle X-ray diffraction studies showed that all polyimides were amorphous. Polyimide ultrafiltration asymmetric membranes were successfully prepared by the traditional phase-inversion method. The cross sections of the polyimide ultrafiltration membranes showed a very thin surface layer and a porous sublayer. The pure water flux was very high and the solute rejection rate at poly(ethylene glycol) of MW 20,000 was above 90%.

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