Fluorinated aromatic polyimide, polyamide and polyamide-imide ga

Details Fluorinated aromatic polyimide, polyamide and polyamide-imide ga Fluorinated aromatic polyimide, polyamide and polyamide-imide ga

1993-05-04

1994-06-14

Foelak, Morton

Gas separation: apparatus

Apparatus for selective diffusion of gases

Membrane having ring containing organic compound

21050038, 21050039, 521 64, B01D 5322

Patent

active

053206509

ABSTRACT:
Novel fluorinated aromatic polyimide, polyamide and polyamide-imide gas separation membranes and the process of using such membranes to separate one or more gases from a gaseous mixture is disclosed. The polyimides, polyamides and polyamide-imides are formed from diamines of the formula ##STR1## where Ar' is any aromatic diol moiety and X is independently fluorinated alkyl groups having 1 to 6 carbon atoms, most preferably a trifluoromethyl group, m is an integer from 1 to 4, preferably 1.

REFERENCES:
patent: 5089593 (1992-02-01), Fjare et al.
patent: 5112941 (1992-05-01), Kasai et al.
patent: 5165963 (1992-11-01), Matsumoto et al.
patent: 5178650 (1993-01-01), Hayes
patent: 5178940 (1993-01-01), Matsumoto et al.
"Permeability and Permselectivity of Gases in Fluorinated and Non-Fluorinated Polyimides" by K. Tanaka, H. Kita, M. Okano and K. Okamoto, Polymer, 1992, vol. 33, No. 3, (pp. 585-592).
"Effects of Structural Features and Humidity on the Dielectric Constant of Polyimides" by Frank W. Mercer and Timothy Goodman, High Performance Polymers, vol. 3, No. 4, 1991 (pp. 297-310).

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