A modified UNIFAC model for the prediction of phase equilibrium for polymer solutions

作者：Liu QL^*; Cheng ZF

来源：Journal of Polymer Science Part B: Polymer Physics , 2005, 43(18): 2541-2547.

DOI：10.1002/polb.20533

• polymer solutions
• van der Waals partition function
• UNIFAC model
• free-volume

A new simple activity coefficient model for the prediction of solvent activities in polymer solutions is presented. The model consists of three terms, the combinatorial and the residual terms, which are taken from UNIFAC model, and a free-volume term derived from the van der Waals partition function with the mixed volume, the mixed free-volume and the mixed c-value being supposed to be given by linear mixing rules. Twenty-one polymer solution systems were used to test the applicability of the present model. Compared with the UNIFAC-FV Entropic-FV and Entropic-FV-1.2 models, it is found that the model proposed in this work can produce better results than those from the other three models. Furthermore, the model is valid for a broad range of polymer concentration and a wide range of temperature.

• 出版日期2005-9-15
• 单位厦门大学