PREDICTION OF INFINITE DILUTION SOLVENT ACTIVITY-COEFFICIENTS IN POLYMER-SOLUTIONS - COMPARISON OF PREDICTION MODELS

The modified group-contribution lattice fluid equation of state (GCLF- EOS), which is capable of predicting accurately vapor-liquid equilibri a in polymer-solvent solutions, was developed by calculating group con tribu tions for the adjustable parameters from the equilibrium propert ies of low molecular weight compounds only, The modified GCLF-EOS has been used to predict the solvent activity coefficients at infinite dil ution of solvents, and its prediction results have been compared with those of the original GCLF-EOS, the UNIFAC-free volume (FV), the entro pic-FV, and the revised GC-Flory EOS. Extensive statistical analyses w ere performed using all the currently available experimental data. The modified GCLF-EOS provided the best performance in the prediction of infinite dilution activity coefficients. The modified GCLF-EOS require s only the structures of the solvent and polymer in terms of their fun ctional groups as input information.