A study of the formation of complexes by crosslinked copolymers of n-vinylpyrrolidone with polyphenols

• Published in: Polymer science USSR 1980, Vol.22 (1), p.65-73
• Main Authors: Bublevskii, I.M., Belykh, S.I., Davydov, A.B., Lipovich, L.M., Mekhuzla, N.A., Smirnova, Ye.A.
• Format: Article
• Language: English
• ISSN: 0032-3950; 1878-268X
• DOI: 10.1016/0032-3950(80)90418-9

It has been shown that the formation of complexes between network copolymers of N-vinylpyrrolidone and the oligomeric products of the condensation of phenol with formaldehyde occurs by amechanism of polymer-polymer cooperative interaction involving the formation of hydrogen bonds between the carbonyl group of the pyrrolidone links and hydroxyl groups of the polyphenol. The stability of the complex passes through an extreme value as a function of the molecular weight of the polyphenol, a fact which is determined by the condition that the length of the polyphenol macromolecule and the size of the sorbing cell should be approximately the same, the cell being bounded by the length of the internodal spacing of the polyvinylpyrrolidone chain and by the length of the crosslinking bridge. The rate of complex formation increases as the temperature is raised and as the temperature of the process is increased and as the pH constant increases as the temperature of the process is increased and as the pH of the medium is decreased, and it does not depend on the particle size of the copolymer.