SYNTHESIS AND PROPERTIES OF HYDROPHILIC POLYMERS, 5 - VISCOSIMETRIC STUDY ON POLY(ACRYLAMIDE-CO-4-VINYLPYRIDINE) AND ITS INTERACTION WITH METAL-IONS IN AQUEOUS-SOLUTION

Poly(acrylamide-co-4-vinylpyridine) synthesized by radical bulk polyme rization behaves in water as a typical polyelectrolyte. According to t he viscosimetric studies, the addition of strong electrolytes, like KN O3 (0.1 M), completely suppressed the polyelectrolyte effect. The inte ractions between this copolymer and a number of metal ions were also s tudied by viscosimetry in aqueous solution. The reduced viscosity decr eased with an increase of the copper(II) concentration due to an intra polymeric complex formation. It was shown that the reduced viscosity o f the polymer-metal complexes depends on the pH. It decreased for a co nstant ratio between the copolymer and the metal ions Fe3+, Co2+, Ni2, Cu2+, and Zn2+. Among these cations, Cu2+ showed the strongest effec t. These results were compared with the corresponding data of both hom opolymers.