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The hydrodynamic properties of dilute 80-'lutions of poly( N-vinyl-2-pyrrolidone) (PVP) and its Co(I1) complexes were studied by high-speed sedimentation and viscosimetry methods. Unperturbed dimensions of PVP in two solvents (ethyl alcohol and water) and those of PVP complexes with the cobalt ions in water were determined. Unperturbed dimensions of PVP coils were shown to be dependent on the solvent nature, and those of polymer-metal complexes on metal concentration.

The character of changing the hydrodynamic and conformational characteristics of vinylpyrrolidone copolymers with acrylic acid depending on solvent nature was studied. Peculiarities in changing the hydrodynamic, molecular characteristics and complex forming properties of equimolar vinylpyrrolidone copolymer with metal ions are revealed. Metal ions introduction in copolymer macromolecules gives rise to polymer‐specific, physiologically active properties.