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Properties of aqueous salt solutions of polyvinylpyrrolidone. I. Viscosity characteristics
Author(s) -
Güner A.
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19961031)62:5<785::aid-app10>3.0.co;2-s
Subject(s) - aqueous solution , polyvinylpyrrolidone , salt (chemistry) , viscosity , chemistry , intrinsic viscosity , polymer , inorganic chemistry , polymer chemistry , nuclear chemistry , materials science , organic chemistry , composite material
The properties of dilute solutions of polyvinylpyrrolidone (PVP) in aqueous salt solutions have been studied by measurements of intrinsic viscosity [η] in theta and nontheta solvents. Intrinsic viscosities of the polymer solutions were observed to decrease upon addition of a variety of inorganic salts (phosphates, monohydrogen phosphates, carbonates, sulfates, and dihydrogen phosphates). Values of the Huggins constant, k H , were found to be higher than 0.35 for PVP in pure water at 298 K, whereas in salt solutions they varied from 0.85 to 1.28 in nontheta solvents. Kraemer's constant, k K , was also determined and k H ‐k K was calculated as 0.78 for PVP in pure water and for aqueous salt solutions of PVP, k H ‐k K = 0.61 at 298 K. k H values were also higher than the predicted range of 0.5–0.7, and k H ‐k K values were noted to be 0.73 in theta solvents. © 1996 John Wiley & Sons, Inc.