Abstract
The phase behavior of the system containing carbon dioxide + dichloromethane + ε-caprolactone + poly(ε-caprolactone) was investigated in order to provide fundamental information to understand the polymerization reaction in a high-pressure system. The experiments were performed using a variable-volume view cell over the temperature range from 323.15 to 353.15 K, different mass ratios of carbon dioxide: dichloromethane: [ε-caprolactone + poly(ε-caprolactone)] (1:0.5:1, 1:1:1, and 1:2:1), different mass average molar mass of poly(ε-caprolactone) (14,000 and 138,840 g∙mol−1), and different poly(ε-caprolactone) mass fractions (reaction conversion) from 0.0 up 15.0 wt%. Phase transitions of vapor-liquid bubble point type were verified and lower critical solution temperature (LCST) behavior phase in P-T diagrams was observed. The experimental results were modeled using the PC-SAFT EoS, providing a positive representation of the experimental phase equilibrium data.
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