Polymer Science Series B

, Volume 49, Issue 5–6, pp 136–138 | Cite as

Thermal sensitivity of poly(N-vinylpyrrolidone) solutions in water-saline media

  • B. I. Nakhmanovich
  • N. I. Pakuro
  • E. I. Akhmet’eva
  • G. I. Litvinenko
  • A. A. Arest-Yakubovich


The effect of salts on the behavior of aqueous solutions of poly(N-vinylpyrrolidone), which is known to show no thermal sensitivity in the absence of additives, has been studied. The introduction of some salts, for example, KF, KH2PO4, K2CO3, and Na2SO4, leads to the occurrence of phase transitions. The corresponding phase transition temperatures depend on the nature and concentration of salts. Even moderate concentrations (0.3–0.6 mol/l) of the most active salts (K2CO3 and Na2SO4) are shown to reduce the phase transition temperature to 10–20°C.


Polymer Concentration Phase Transition Temperature Thermal Sensitivity Active Salt Phase Separation Temperature 
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Copyright information

© Pleiades Publishing, Ltd. 2007

Authors and Affiliations

  • B. I. Nakhmanovich
    • 1
  • N. I. Pakuro
    • 1
  • E. I. Akhmet’eva
    • 1
  • G. I. Litvinenko
    • 1
  • A. A. Arest-Yakubovich
    • 1
  1. 1.State Scientific Center of the Russian FederationKarpov Institute of Physical ChemistryMoscowRussia

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