Abstract The phase behavior of the system containing carbon dioxide + dichloromethane + e-caprolactone + poly(e-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: [e-caprolactone + poly(e-caprolactone)] (1:0.5:1, 1:1:1, and 1:2:1), different mass average molar mass of poly(e-caprolactone) (14,000 and 138,840 g∙mol−1), and different poly(e-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.

中文翻译：

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不同聚合物摩尔质量对二氧化碳+二氯甲烷+ε-己内酯+聚(ε-己内酯)体系相行为的影响

摘要 研究了含有二氧化碳 + 二氯甲烷 + ε-己内酯 + 聚（ε-己内酯）的体系的相行为，为理解高压体系中的聚合反应提供基本信息。实验是在 323.15 到 353.15 K 的温度范围内使用可变体积观察室进行的，二氧化碳的不同质量比：二氯甲烷：[e-己内酯 + 聚（e-己内酯）]（1:0.5:1, 1 :1:1 和 1:2:1)，聚（ε-己内酯）的不同质量平均摩尔质量（14,000 和 138,840 g∙mol−1），以及不同的聚（ε-己内酯）质量分数（反应转化率）从 0.0 到 15.0 wt%。验证了汽液泡点类型的相变，并观察到 ​​PT 图中的较低临界溶解温度 (LCST) 行为相。