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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

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Abstract

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.

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Correspondence to O. A. Dommes.

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Translated by G. Kirakosyan

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Pavlov, G.M., Dommes, O.A., Okatova, O.V. et al. Electrostatic Long-Range Interactions in Macromolecules of Flexible-Chain Linear Polyelectrolytes with Low Charge Density in Aqueous Solutions of Different Ionic Strength. Dokl Phys Chem 489, 164–167 (2019). https://doi.org/10.1134/S0012501619110022

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  • DOI: https://doi.org/10.1134/S0012501619110022

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