Abstract
Phase behavior data are presented for poly(l-lactide) in supercritical mixtures of dichloromethane and carbon dioxide. Cloud point pressures were measured using a variable-volume view cell apparatus as functions of temperature, dichloromethane composition in a mixed solvent, and molecular weight of poly(l-lactide) at the polymer concentration of ≈0.05 mass fraction in solution. This system exhibited the characteristics of lower critical solution temperature phase behavior. As the dichloromethane composition in the mixed solvent increased, the cloud point pressure at a fixed temperature decreased significantly. The cloud point pressure increased linearly with a logarithmic increase of the poly(l-lactide) molecular weight.
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