Phase behaviour of the ternary mixture system of poly(l-lactic acid), dichloromethane and carbon dioxide

In this study, the high pressure phase behaviour of poly(l-lactic acid) (M = 312,000), dichloromethane and carbon dioxide ternary mixtures was studied using a variable volume view cell at temperatures ranging from 313.15 K to 363.15 K and pressures of up to 30.0 MPa as functions of temperature and the CO ₂/dichloromethane mass ratio at poly(l-lactic acid) weight fractions of 1.0%, 2.5% and 3.0%. The experimental results were correlated with the hybrid equation of state for the CO ₂-polymer system using the van der Waals one-fluid mixing rule with three adjustable binary interaction parameters.