A Modified Entropic-FV Nonrandom Factor Model for Polymer Solution
Jun Gao · Journal of Chemical Engineering of Chinese Universities · 2003
A modified entropic-FV contribution and nonrandom factor part (NRF) model for polymer solution was proposed, in which the modified entropic-FV term is used to express the effects of the size and structure difference between molecues and the NRF term is used to express the contribution of the weak local physical interaction between solvent and segments of polymer chains in the polymer solution to excess Gibbs free energy. Using the proposed model, the calculating results were compared with those obtained from Zafarani-Moattar model, Flory-Huggins model and the UNIFAC-FV model. The model proposed in this work gives better results in agreement with experimental data. For 45 binary polymer-solvent systems, the total average absolute deviation of the solvent activities in polymer solutions is 1.19% for the new model, 2.465% for Zafarani-Moattar model, 3.738% for Flory-Huggins model and 10.149% for UNIFAC-FV model.