Phase behavior of poly(1,1-dihydroperfluorooctylacrylate) in supercritical carbon dioxide

Liquid-fluid phase equilibria data are reported for the poly(1,1-dihydroperfluorooctylacrylate) (poly(FOA))-CO2 system at sub- and supercritical fluid conditions and modeled with the statistical associated fluid theory (SAFT). Lower critical solution temperature (LCST) phase behavior is observed with a critical concentration between 1.0 and 2.0 wt.% poly(FOA). The high solubility of poly(FOA) is consistent with its low cohesive energy density and the weak van der Waals forces of CO2. To aid this analysis, pressure-volume-temperature (PVT) data are reported for pure poly(FOA) and correlated with lattice-fluid and SAFT theory. (C) 1998 Elsevier Science B.V. All rights reserved.