Phase behavior for the poly(dimethylsiloxane) in supercritical fluid solvents

Abstract

In this work, cloud-point and bubble-point phase behavior data are reported for the poly(dimethylsiloxane) [PDMSA] in supercritical carbon dioxide, propane, propylene, butane, 1-butene and dimethyl ether (DME). The static-type method, using a variable-volume view cell, was employed to obtain the experimental data at the temperature range for (315.2–454.9)K and pressure up to 55.52MPa. PDMS (Mw=38,900)+C4 cloud-point curves are ∼10MPa lower than the PDMS+C3 curves at constant temperature of 423K. Cloud-point curves for the PDMS+solvents system show the lower critical solution temperature (LCST) region.