Phase behaviors for the poly(2-phenylethyl methacrylate) in supercritical fluid solvents: Experiment and PC-SAFT EoS

Abstract

In this work, the experimental cloud-points in the binary and ternary mixtures for poly(2-phenylethyl methacrylate) [P(2-PEMA)] solutions containing supercritical solvents (i.e., carbon dioxide, propylene, 1-butene, dimethyl ether (DME)) are carried out up to 473K and 224MPa. According to the amount of cosolvent (i.e., DME), the cloud-point curves for ternary mixtures of P(2-PEMA) in supercritical solvents (i.e., carbon dioxide, propylene, 1-butene) show the changes from upper critical solution temperature (UCST) behavior to lower critical solution temperature (LCST) behavior. The PC-SAFT equation of state is applied to correlate the phase behaviors of all experimental systems, and the calculated results are shown as a reasonable agreement with experimental data. According to the amount of DME (i.e., cosolvent), the UCST- and LCST-type phase behaviors are described exactly by PC-SAFT EoS with one adjustable binary interaction parameter on which the effect of temperature and/or cosolvent amount is not considered.