Membranes formed from unsaturated polyimides

Details Membranes formed from unsaturated polyimides Membranes formed from unsaturated polyimides

1989-10-11

1990-08-28

Spitzer, Robert

Gas separation

Means within gas stream for conducting concentrate to collector

55 16, 21050039, B01D 5322, B01D 7164

Patent

active

049522205

ABSTRACT:
The present invention is a class of polyimide membranes containing copolymerizable, surface modifiable units containing both aromatic diamines and alkenylated diamines having an allyl or allylaryl group preferably positoned ortho to an amine functionality. The polyimide membranes can be surface modified by treatment with an activating force such as high energy electromagnetic irradiation or with a free radical source to impart high selectivity to the membrane without causing a large decrease in composite permeance.

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Kim, et al, "Reverse Permselectivity of N.sub.2 Over CH.sub.4 in Aromatic Polyimides", J. Appl. Poly. Sci., vol. 34, (1987), pp. 1767-1771.

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