Cj. Gregg et al., PHASE-BEHAVIOR OF BINARY ETHYLENE-PROPYLENE COPOLYMER SOLUTIONS IN SUBCRITICAL AND SUPERCRITICAL ETHYLENE AND PROPYLENE, Fluid phase equilibria, 83, 1993, pp. 375-382
Temperature-pressure and pressure-concentration cloud-point transition
s were measured for solutions of ethylene-propylene copolymer (PEP) in
ethylene and in propylene in the critical region. The cloud points we
re visually observed in variable-volume optical cells up to 200-degree
s-C and 2000 bar. While UCST, LCST, and U-LCST transitions were observ
ed for PEP solutions in propylene, only U-LCST behavior was observed f
or PEP solutions in ethylene for the molecular weight range investigat
ed (790-96000 g/mol). Statistical Associated Fluid Theory (SAFT) was u
sed to correlate the experimental cloud points.