AIChE Journal · 1988 · 61 citations · 20 references
Natural SciencesChemical EngineeringChemistryPolymer ChemistryPolymer MaterialsThermal AnalysisHigh-pressure ThermodynamicsPolymer CharacterizationPolymer Phase BehaviorPolymer Physical ChemistryPolymer PhysicsPolymer ThermodynamicsCritical Solution TemperatureCritical TemperatureLower Critical Solution TemperaturePolymer Phase DiagramsPolymer Solution Phase BehaviorPolymer Solution ThermodynamicsPolymer Thermal DegradationSolution-phase Equilibria
Abstract The effect of supercritical ethane on the high‐pressure phase behavior of the polystyrene‐toluene system is experimentally investigated. Adding 17.8 wt. % ethane to the polystyrene‐toluene solution lowers the temperature of the lower critical solution temperature (LCST) curve by 162°C, 22.5 wt. % lowers the temperature of the curve by 231°C, and with 24.9 wt. % the curve is shifted to such low temperatures that it merges with the upper critical solution temperature curve. In practice this means that polymer solutions can be separated at lower temperatures where thermal degradation of the polymer is less. Also, more than 99 wt. % of the polystyrene is recovered in the polymer‐rich phase after the solution phase splits. Patterson's corresponding states treatment is used to model the LCST data.
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Lower critical points in polymer solutions
Pauline Freeman, J. S. Rowlinson · Polymer · 1960 · 203 citations
Upper and Lower Critical Solution Temperatures in Polystyrene Solutions
Susumu Saeki, N. Kuwahara, S. Konno et al. · Macromolecules · 1973 · 145 citations