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Electrostatic Long-Range Interactions in Macromolecules of Flexible-Chain Linear Polyelectrolytes with Low Charge Density in Aqueous Solutions of Different Ionic Strength
Doklady Physical Chemistry  (IF0.638),  Pub Date : 2019-11-01, DOI: 10.1134/s0012501619110022
G. M. Pavlov, O. A. Dommes, O. V. Okatova, I. I. Gavrilova, E. F. Panarin

Molecular hydrodynamics methods (translational diffusion, velocity sedimentation, viscometry) have been used to study copolymers of N-methyl-N-vinylacetamide and N-methyl-N-vinylamine hydrochloride with an average content of charged groups (4.4 ± 0.2) mol % in aqueous 0.2 M NaCl solution. Kuhn–Mark–Houwink–Sakurada scaling relationships have been obtained. Viscous flow has been studied in the widest possible range of ionic strengths of aqueous solutions, from salt-free to 6 M NaCl. The data have been compared with those previously obtained for neutral poly-N-methyl-N-vinylacetamide. It has been shown experimentally for the first time that the character of the dependence of the intrinsic viscosity on the molecular mass of a copolymer of such a composition in solutions of minimal ionic strength is typical of the chains exhibiting intrachain volume effects, i.e. electrostatic long-range interactions.