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Vol. 25 No. 2 (2013): Vol 25 Issue 2

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A Modified UNIFAC Model for Polymer Solutions

https://doi.org/10.14233/ajchem.2013.12619
Zhenfeng Cheng
Department of Chemical Engineering and Food Engineering, Xiangfan University, Xiangfan 441053, Hubei Province, P.R. China
Changyou Li
Department of Chemistry and Chemical Engineering, Henan University of Urban Construction, Pingdingshan 462500, Henan , P.R. China

Corresponding Author(s) : Zhenfeng Cheng

junru411@mail.ustc.edu.cn

Asian Journal of Chemistry, Vol. 25 No. 2 (2013): Vol 25 Issue 2

Abstract

For not considering the effect of free volume, the predictive results of the UNIFAC model in polymer solution systems are not acceptable. To improve the predictive accuracy, a free-volume term derived from the van der Waals partition function is added into the UNIFAC model, experimental data of 19 polymer solution systems are used to test the modified model, which is compared with the UNIFAC model, the UNIFAC-FV model and the Entropic-FV-1.2 model, and the results showed that the modified model is mostly better than other models. Furthermore, the model is valid for the whole range of polymer concentration (from dilute solution up to saturation).

Keywords

Polymer solution van der Waals partition function UNIFAC model Entropic-FV-1.2 model
Cheng, Z., & Li, C. (2012). A Modified UNIFAC Model for Polymer Solutions. Asian Journal of Chemistry, 25(2), 731–734. https://doi.org/10.14233/ajchem.2013.12619
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