Aqueous biphasic systems formed by nonionic polymers II. Concentration effects of inorganic salts on phase separation |
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| Authors: | B. Yu. Zaslavsky A. U. Mahmudov T. O. Bagirov A. A. Borovskaya G. Z. Gasanova N. D. Gulaeva V. Yu. Levin N. M. Mestechkina L. M. Miheeva M. N. Rodnikova |
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| Affiliation: | (1) Present address: Institute of Elementoorganic Compounds, USSR Academy of Sciences, Moscow, USSR;(2) Azerbaydzhan State University, Baku, USSR;(3) Institute of General and Inorganic Chemistry, U.S.S.R. Academy of Sciences, Moscow, USSR |
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| Abstract: | Concentration effects of KSCN, KClO4, KI, KBr, KNO3, KCl, KF and K2SO4 on the compatibility of dextran with ficoll, polyvinylpyrrolidone and poly(ethylene glycol) at fixed polymer concentration ratios were studied in aqueous solution. The results obtained are considered in terms of the Patterson theory of  -effect. It is assumed that phase separation in an aqueous solution of two nonionic polymers results from the appearance of two different water structures in the vicinity of the phase polymers. The data obtained are considered in terms of the concept of  salting-in-salting-out effects of neutral salts on aqueous solubility of biopolymers. The salt effects observed are attributed to two antagonistic influences of salts on the electrostatic (dipole-dipole) polymer-water interactions and on the water-water interactions in the vicinity of the phase polymers. |
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| Keywords: | Phase systems phase separation polymer compatibility inorganic salts water structure |
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