High pressure phase behavior of carbon dioxide plus 2,2,2-trifluoroethyl methacrylate and plus poly(2,2,2-trifluoroethyl methacrylate) systems

Pressure-composition isotherms for binary mixtures of carbon dioxide (CO2) + 2,2,2-trifluoroethyl methacrylate (TFEMA) were investigated in a variable volume view cell at temperature from (323.2 to 353.2) K and pressure up to about 12 MPa. Phase behavior of these binary experimental data were correlated with Peng-Robinson equation of state using a van der Waals one fluid mixing rule with two adjustable parameters. The cloud points of CO2 + poly(2,2,2-trifluoroethyl methacrylate) (poly(TFEMA)) were investigated at temperature up to 450 K and pressure up to 59.4 MPa. The CO2 + poly(TFEMA) system showed LCST pressure behavior. The Sanchez-Lacombe lattice fluid equation of state is used to correlate the experimental cloud point data.