Thermodynamic-mixing-parameter estimation systems

The analysis of concentration and temperature dependencies of thermodynamic parameters, calculated using phase diagrams, provides not only explanation of some compatibility features but also the way to estimate structural characteristics of oligomer systems. This approach is rather prospective, that will be illustrated below by examples analyzing mixing thermodynamics of various oligomer system types. 

The above approach is empirical. Thermodynamic models for describing solution behavior can also be employed to determine gas solubilities, and these models are amenable to the estimation of gas solubilities in multicomponent systems from sets of single salt data. The thermodynamic approach employed is known as the Pitzer species interaction model, and it is used to determine the activity coefficient of the gas from a summation of interaction terms with anions, cations, and neutral species [3, 10, 11]. These interaction parameters are determined empirically from solubility data in a range of electrolyte solutions and have been tabulated for a wide range of salts, permitting the solubility of oxygen to be determined in mixed electrolyte solutions over a wide range of temperature and concentrations. 

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