Abstract
This chapter discusses the development of simplified equation of states for molecular fluids and their applications for the investigation of supercritical chain molecule solutions and mixtures. The model has been developed based on the TPT1 approach by mapping on a mathematical simplified equation of state. This equation is one of the results of the investigation of empirical cubic and molecular-based equations of state. Simple and molecular-based equations are important to avoid artificial behavior, which can appear with mathematically complicated equations, especially in the context of complex phase behavior as investigated here. With this equation, co- and anti-solvent effects in supercritical oligomer and polymer solutions are investigated, qualitatively and semiquantitatively. Based on the systematic investigation in a global phase diagram, different paths are established which represent different effects of an additive on the phase behavior. It is found that each of such paths corresponds to different kinds of molecular interactions of an additive with the solvent and the solute.
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