Prediction of Excess Thermodynamic Functions and Activity Coefficients of Some Polymeric Liquid Mixtures Using a Simple Equation of State

The topic of this study, excess thermodynamic properties of the binary mixtures, is one of the most interesting phenomena in molecular physics. They provide us information to understand the observed properties of the mixtures from the point of view of microscopic interactions [1]. Excess thermodynamic properties of mixtures provide insight into the molecular interactions between the various components and can be used for the development of molecular models describing the thermodynamic behavior of mixtures [2]. From a practical point of view, the excess molar volumes are useful for the design of mixing and storage tanks and transport equipments [3]. This study was undertaken to investigate the excess thermodynamic properties and activity coefficients of four polymer mixtures and blends consist of poly (ethylene glycol methyl ether)- 350 (PEGME-350) + poly (ethylene glycol)-200 (PEG-200), poly(propylene glycol)-425 (PPG- 425)+PEGME-350(2), PEGME- 350 + PEG-600, and PEG-200 + PPG-400 using the GMA EoS [4].