Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1978-07-24
1979-10-30
Anderson, Harold D.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 296AB, 526236, 526303, 526341, C08L 3504
Patent
active
041728238
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 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 nitric acid is removed by washing the casting in water or in aqueous liquids.
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Stoy Artur
Urbanova Renata
Anderson Harold D.
Ceskoslovenska akademie ved
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