Modeling the phase behavior of commercial biodegradable polymers and copolymer in supercritical fluids

摘要: Abstract Biodegradable polymers have received much attention as materials for reducing environmental problems caused by conventional plastic wastes. In this work, the thermodynamic behavior of binary and ternary systems composed commercial biodegradable high-pressure fluids [poly( d , l -lactide) + dimethyl ether, poly( -lactide) + carbon dioxide, -lactide) + chlorodifluoromethane, -lactide) + difluoromethane, -lactide) + trifluoromethane, -lactide) + 1,1,1,2-tetrafluoroethane, poly(butylene succinate) + carbon dioxide ether + carbon dioxide] formed copolymers supercritical [poly(butylene succinate-co-butylene adipate) + carbon were studied. The Perturbed Chain-SAFT (PC-SAFT) Sanchez–Lacombe (SL) non-cubic EoS used to model liquid–fluid equilibrium (LFE) these systems, fitting one temperature-dependent interaction parameter. For comparison, same data also modeled using traditional Peng–Robinson (PR) cubic EoS. three pure-component parameters PC-SAFT SL two PR regressed (liquid pressure–volume–temperature copolymer vapor pressure saturated liquid molar volume fluids). estimation was performed modified maximum likelihood method with an objective function that includes cloud point pressure. An excellent agreement obtained EoS, while performance less satisfactory.