Determination of Phase Equilibrium (SolidW22;LiquidW22;Gas) in Poly-(ε-caprolactone)W22;Carbon Dioxide Systems

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• 作者：Esther de Paz ; ngel Martn ; Soraya Rodrguez-Rojo ; Javier Herreras ; Mara Jos Cocero
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2010
• 出版时间：August 12, 2010
• 年：2010
• 卷：55
• 期：8
• 页码：2781-2785
• 全文大小：129K
• 年卷期：v.55,no.8(August 12, 2010)
• ISSN：1520-5134

文摘

SolidW22;liquidW22;gas equilibrium of poly-(ε-caprolactone)W22;carbon dioxide systems at high pressure has been determined by visual determination of the first melting point using a static apparatus. Measurements have been performed with poly-(ε-caprolactones) of three different molecular weights: 4000 g·mol^W22;1, 10000 g·mol^W22;1, and 25000 g·mol^W22;1. The determined SLG equilibrium lines show a temperature maximum at low pressures (0.5 Pa < P < 1.6 MPa) and a temperature minimum at moderate pressures (8 MPa < P < 10 MPa). The maximum reduction of melting temperature ranges from (12.5 to 16.0) K depending on the molecular weight of the polymer. A thermodynamic model based on the PC-SAFT equation of state has been developed to describe experimental data.