Expansible macromolecular material and porous macromolecular mem

Details Expansible macromolecular material and porous macromolecular mem Expansible macromolecular material and porous macromolecular mem

1987-03-30

1988-01-05

Foelak, Morton

Liquid purification or separation

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521 61, 521 62, 521 64, B01D 3914

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active

047178000

ABSTRACT:
An expansible macromolecular material is produced by a method which comprises mixing an aqueous polyvinyl alcohol solution, an acidic aqueous macromolecular electrolyte solution, and a basic aqueous macromolecular electrolyte solution thereby preparing a composite polymer and subjecting this composite polymer to at least one cycle of alternate freezing and defrosting treatments. A macromolecular membrane constituted of said expansible macromolecular material and containing numerous through holes is obtained by mixing, freezing, and defrosting the aforementioned three mixed aqueous solutions under specific conditions.

REFERENCES:
patent: 3876581 (1975-04-01), Neogi
patent: 4083906 (1978-04-01), Schindler et al.
patent: 4109066 (1978-08-01), Dick et al.
patent: 4401790 (1983-08-01), ter Jung et al.

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