Ionogenic hydrophilic water-insoluble gels from partially hydrol

Details Ionogenic hydrophilic water-insoluble gels from partially hydrol Ionogenic hydrophilic water-insoluble gels from partially hydrol

1975-11-20

1978-08-15

Hayes, Lorenzo B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 296AN, 260 296HN, 260 296MQ, 260 296MN, 264182, 351160, 526 23, C08L 3320

Patent

active

041071212

ABSTRACT:
The invention relates to new ionogenic hydrogels based on partially hydrolyzed polymers containing, in the starting material, at least 60, advantageously at least 80% (mol.) of acrylonitrile units, said hydrogels being characterized by a weakly ampholytic, character and by a multiblock structure of polymeric chains with continuous sequences of acrylonitrile units in an amount of from 2 to 95% (molar), alternating with continuous sequences of hydrophylic units consisting of a major amount of acrylic acid and a minor amount of acrylamide units, the sequences or blocks of acrylonitrile units forming together polyacrylonitrile domains detectable by X-ray analysis. In water-swelled condition the hydrogels consist of two distinct but inseparable phases, one of them said polyacrylonitrile, the other said amorphous hydrophilic, highly solvated chains with predominating acrylic acid units. Each macromolecular chain, containing, in average, several blocks or sequences of the said two sorts, (non-hydrolyzed polyacrylonitrile and hydrolyzed to acrylic acid and acrylamide units), takes part of several domains of the two phases. This structure is uniform and homogeneous in the whole cross-section of any article manufactured from the hydrogel.

REFERENCES:
patent: 2716093 (1955-08-01), McClellan
patent: 2812317 (1957-11-01), Barrett
patent: 3812071 (1974-05-01), Stoy
patent: 3897382 (1975-07-01), Stoy et al.

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