| Abstract
| - The phase diagrams of Ucon 50-HB-5100 (Ucon) + ammonium sulfate (NH4)2SO4 + water, Ucon 50-HB-5100 + poly(vinyl alcohol) 10000 (PVA 10000) + water, Ucon 50-HB-5100 + hydroxypropyl starch (ReppalPES 100) + water, and poly(ethylene glycol) 8000 (PEG 8000)−PVA 10000 systems were determined at22 °C. Measurements at 30 and 40 °C were also done for each Ucon−salt system. A linear regression wasused to calculate the slope and standard deviation for each tie line. The standard deviations are in mostsituations lower than 0.1, and the tie-line slopes for each phase diagram vary within 5.5% around themedium value for all cases with the exception of the Ucon + (NH4)2SO4 + water system at 40 °C. Thephase diagrams of the Ucon + (NH4)2SO4 + water system at different temperatures were shown to havea smaller amount of salt and polymer than conventional systems and to be thermoseparating, versatile,and particularly attractive, since phase formation is temperature-dependent. The phase diagrams of Ucon+ PVA 10000 + water, Ucon + PES + water, and PEG + PVA 10000 + water systems were very similar,since high polymer concentrations (PES or PVA 10000) are required to form the two phases.
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