Thermodynamic Interactions and Phase Behavior of Multicomponent Blends Containing Supercritical Carbon Dioxide, Styrene鈥揂crylonitrile Random Copolymer, and Deuterated Poly(methyl methacrylate)

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• 作者：Nicholas P. Young ; Sebnem Inceoglu ; Gregory M. Stone ; Andrew J. Jackson ; Steven R. Kline ; St茅phane Costeux ; Nitash P. Balsara
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：November 25, 2014
• 年：2014
• 卷：47
• 期：22
• 页码：8089-8097
• 全文大小：503K
• ISSN：1520-5835

文摘

Small-angle neutron scattering (SANS) was used to probe the phase behavior of multicomponent mixtures of supercritical carbon dioxide (scCO₂), styrene鈥揳crylonitrile random copolymer, and deuterated poly(methyl methacrylate). Ternary mixtures were homogeneous at low carbon dioxide pressures (P_CO2) but phase separated as P_CO2 was increased at constant temperature (T). Phase separation pressure was found to be a nonmonotonic function of T with a minimum at T = 60 掳C. An expression based on the multicomponent random phase approximation was used to determine the interaction parameters between polymer and scCO₂ from a combination of SANS experiments on homogeneous ternary mixtures and measurements of scCO₂ uptake by the neat polymers. Interaction parameters that underlie the nonmonotonic phase behavior described above collapse onto a straight line when plotted as a function of scCO₂ density.