Combined Physical and Chemical Model for Solvent Activity of Polymer Solutions

The objective of this work was to improve the accuracy of thermodynamics model for prediction of solvent activities in polymer solutions by considering new model with (1) chemical theory to account chemical reaction (solvation) between solute and solvent,(2) Flory-Huggins theory for the difference of molecular volumes, and (3) NRTL equation for the interaction between molecules. The utility of the model is demonstrated successful representation of the vapor-liquid equilibria of several polymer solutions. The results are compared with those obtained from the models that consider physical contribution only.

Keywords:

Polymer solution , Vapor-liquid equilibria , Solvent activities , Thermodynamics Model