Abstract
Design of organohydrogels with exceptional physical properties requires simple and reliable models for swelling of polymer networks in mixtures of water with organic solvents. A model is developed for equilibrium solvent uptake by thermoresponsive gels in binary mixtures that involves a relatively small number of adjustable parameters and describes various types of swelling diagrams (monotonically decreasing, with points of minimum, and with several maxima and minima) in a unified manner. Its ability to describe (and to predict qualitatively) equilibrium swelling curves is confirmed by fitting experimental data on poly(N-isopropylacrylamide), poly(N,N-dimethylacrylamide), poly(acryloyl-L-proline methyl ester), and poly(acrylamide) gels in mixtures of water with acetone, acetonitrile, dioxane, dimethyl sulfoxide, ethanol, methanol, N-methylpyrrolidone, 1-propanol, and tetrahydrofuran.
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