Abstract
AbstractPoly(N‐Vinyl 2‐pyrrolidone‐g‐tartaric acid), PVP‐g‐TA hydrogels were prepared by γ‐irradiating ternary mixture of VP/TA/Water. The influence of pH, temperature and ionic strength of swelling media on the equilibrium swelling properties of these hydrogels was investigated. Typical pH and temperature responses were observed by hydrogels such as high pH and low temperature swelling and low pH and high temperature deswelling. A change in the ionic strength of the swelling solution from 0.01 to 0.2 caused a decrease in equilibrium degree of swelling hydrogels. The average molecular weight between cross‐links, M c and polymer ‐ solvent interaction parameter, χ of PVP‐g‐TA hydrogels were determined according to equation recently derived by Şen and Güven for the swelling behavior of charged polymeric network. Copyright © 2002 John Wiley & Sons, Ltd.
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