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Thermosensitivity of poly(N-vinylpyrrolidone): Effect of transition-metal halides

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Abstract

The effect of the halides of a series of transition metals on the properties of aqueous solutions of poly(N-vinylpyrrolidone) is studied. It is shown that the introduction of ZnCl2 into solutions of poly(N-vinylpyrrolidone) causes phase separation with an increase in temperature. In the presence of halides of other transition metals (CdCl2, CuCl2), this phenomenon is not observed. However, the addition of HCl and/or alkali-metal halides to these systems likewise gives rise to phase separation, and in the ZnCl2-based systems, the cloud point of solution substantially decreases with the introduction of alkali-metal salts. The same situation is observed in the case of polyvinylcaprolactam. Thus, it is concluded that the observed phenomena are associated with the formation of MtCl 2−4 complex anions in solutions that promote the globulization of polymer chains with participation of water molecules surrounding polymer chains and cations of transition-metal salts bound to complexes with C=O groups of lactam rings of the polymers.

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Authors and Affiliations

  1. Karpov Institute of Physical Chemistry, per. Obukha 3-1/12, str. 6, Moscow, 105064, Russia

    N. I. Pakuro, B. I. Nakhmanovich & F. Kh. Chibirova

  2. Faculty of Chemistry, Moscow State University, Moscow, 119991, Russia

    D. V. Pergushov

Authors
  1. N. I. Pakuro
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  2. B. I. Nakhmanovich
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  3. D. V. Pergushov
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  4. F. Kh. Chibirova
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Correspondence to N. I. Pakuro.

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Original Russian Text © N.I. Pakuro, B.I. Nakhmanovich, D.V. Pergushov, F.Kh. Chibirova, 2011, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2011, Vol. 53, No. 1, pp. 9–14.

This work was supported by the Russian Foundation for Basic Research, project nos. 06-03-32505a and 06-03-08036.

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Pakuro, N.I., Nakhmanovich, B.I., Pergushov, D.V. et al. Thermosensitivity of poly(N-vinylpyrrolidone): Effect of transition-metal halides. Polym. Sci. Ser. A 53, 6–11 (2011). https://doi.org/10.1134/S0965545X11010044

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  • DOI: https://doi.org/10.1134/S0965545X11010044

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