ISSN:
0887-624X
Keywords:
polyimides
;
photooxidation
;
surface modification
;
gas separations
;
ultraviolet irradiation
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Polyimide membranes that contain both the phthalimide chromophore and abstractable hydrogens undergo photochemically-induced oxidative surface modification when they are irradiated with ultraviolet (UV) light for 0.5-30 min in air. The reaction requires 200-300 nm light and the presence of oxygen, and the surface-modified membranes show much higher oxygen/nitrogen selectivities than the untreated films. A mechanism for the photochemical reaction that is based on the photochemistry of structurally-similar monomeric phthalimides is proposed. The observed selectivity increases can also be explained by this mechanism. © 1993 John Wiley & Sons, Inc.
Additional Material:
8 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pola.1993.080310110
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