Method of preparing shaped articles from cross-linked hydrogels

Details Method of preparing shaped articles from cross-linked hydrogels Method of preparing shaped articles from cross-linked hydrogels

1976-02-04

1978-10-31

Anderson, Harold D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 296H, 260 296AB, 260 296MN, 526 49, 526 23, 526236, 526341, 521 63, 521 481, C08L 3504

Patent

active

041234065

ABSTRACT:
A method of preparing cross-linked hydrogels in the form of shaped articles, insoluble in any solvent but swellable in water and in aqueous liquids, is provided. The method comprises polymerizing acrylonitrile alone or with a minor amount up to 15% by weight of monoethylenically unsaturated monomers copolymerizable with acrylonitrile under conditions of radical polymerization in concentrated, i.e. 50 to 72%, nitric acid in the absence of any added chain-transfer and cross-linking agents, said monomer or monomers being used in concentrations making possible cross-linking by chain transfer onto the monomer, i.e. in concentrations ranging from 15 to 50%, preferably from 25 to 40% by weight, at temperatures ranging from 0.degree. to 50.degree. C, preferably from 5.degree. to 20.degree. C. The polymerization is carried out in a mold. The lyogel thus obtained is then kept within the same temperature range until the desired swelling capacity in water is reached, and the nitric acid is removed by washing the casting in water or in aqueous liquids.

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