SELECTIVITY ENHANCEMENT VIA PHOTOOXIDATIVE SURFACE MODIFICATION OF POLYIMIDE AIR SEPARATION MEMBRANES

被引：32

作者：

MEIER, IK

LANGSAM, M

KLOTZ, HC

机构：

[1] Air Products and Chemicals, Inc., Allentown, PA 18195-1501

来源：

JOURNAL OF MEMBRANE SCIENCE | 1994年 / 94卷

关键词：

GAS SEPARATIONS; GAS AND VAPOR PERMEATION; POLYIMIDES; SURFACE MODIFICATION;

D O I：

10.1016/0376-7388(93)E0174-I

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The scope and limitations of photooxidative surface modification of polyimide films were investigated as a means of improving the selectivities of air separation membranes without drastically reducing their permeabilities. Membranes of polyimides that contained the phthalimide chromophore and abstractable hydrogens showed significantly higher oxygen/nitrogen selectivities after being irradiated with approximately 200-300 nm light in the presence of oxygen for 0.5-30 min. Not only were benzylic hydrogens found to be abstractable, but also certain t-butyl hydrogens could be abstractable under these conditions. A mechanism for the photochemical reaction that is based on the photochemistry of structurally similar monomeric phthalimides is proposed to explain the observed selectivity enhancement.

引用

页码：195 / 212

页数：18

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[2]

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