PHASE-BEHAVIOR OF POLY(1,1-DIHYDROPERFLUOROOCTYLACRYLATE) IN SUPERCRITICAL CARBON-DIOXIDE

Liquid-fluid phase equilibria data are reported for the poly(1,1-dihyd roperfluorooctylacrylate) (poly(FOA))-CO2 system at sub- and supercrit ical fluid conditions and modeled with the statistical associated flui d theory (SAFT). Lower critical solution temperature (LCST) phase beha vior 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 l ow cohesive energy density and the weak van der Waals forces of CO2. T o aid this analysis, pressure-volume-temperature (PVT) data are report ed for pure poly(FOA) and correlated with lattice-fluid and SAFT theor y. (C) 1998 Elsevier Science B.V. All rights reserved.