Abstract
A new simple activity coefficient model for the prediction of solvent activities in polymer solutions is presented. The model consists of two terms, a recently proposed «combined» combinatorial-free-volume term by Elbro et al. and the residual term of UNIFAC. The linear temperature-dependent parameter table for UNIFAC, recently developed by Hansen et al., is used. The ability of the new model to predict solvent activity coefficients at infinite dilution for many different polymer-solvent systems is shown
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