Membranes containing microporous structure

Details Membranes containing microporous structure Membranes containing microporous structure

1986-12-01

1988-10-04

Spear, Frank

Liquid purification or separation

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55 16, 55158, 21050043, 264 22, B01D 1300

Patent

active

047754745

ABSTRACT:
Asymmetric membranes are prepared by treating a major surface of a glassy polymer composition to render the surface resistant to solvent crazing and then contacting the glassy polymer composition with a crazing solvent. The crazing solvent permanently deforms the glassy polymer composition by forming a microporous structure on the untreated surface. The treated surface becomes the dense, discriminating layer of the membrane which achieves desirable permeation selectivity. The methods of treatment are (1) crosslinking, (2) providing an agent which renders the surface resistant to crazing, and (3) providing an agent which reacts with the surface. Additionally, the glassy polymer composition can be crosslinked before or after it is crazed to increase the mechanical strength of the membrane.

REFERENCES:
patent: 3062905 (1962-11-01), Jennings et al.
patent: 3083118 (1963-03-01), Bridgeford
patent: 3750735 (1973-08-01), Chiang et al.
patent: 4115303 (1978-09-01), Marchand et al.
patent: 4230463 (1980-10-01), Henis et al.
patent: 4468502 (1984-08-01), Malon et al.
patent: 4486376 (1984-12-01), Makino et al.
patent: 4595707 (1986-06-01), McCreedy et al.

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