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Polymerization and polymers of <i>N</i>‐vinylpyrrolidone
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1957
Year
EngineeringPolyelectrolyte GelsResponsive PolymersPolyelectrolyte GelChemistryPolymersChemical EngineeringPolymer ProcessingLow Charge DensityN ‐VinylpyrrolidonePolymer ChemistryMaterials SciencePolymer EngineeringBiopolymersPolymer AnalysisBiopolymer GelPolymer SciencePolymer CharacterizationFunctional PolymerPolymer Reaction
Abstract Experiments are reported on the rate of polymerization of N ‐vinylpyrrolidone in the presence and in the absence of azobisisobutyronitrile as initiator. The reactions of N ‐vinylpyrrolidone in aqueous acid solution are mentioned. The limited degree of swelling of crosslinked polyvinylpyrrolidone is discussed. Degree of swelling is influenced by choice of solvent, by temperature and, in aqueous systems, by ions which are present on the network of the gel. These ionized groups can be introduced by copolymerization with unsaturated acids or by adsorption of ions from solution. Certain dyes are especially suitable for the formation, in this way, of polyelectrolyte gels having a low charge density.