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

Published

Author(s)

Nicholas P. Young, Sebnem Inceoglu, Gregory M. Stone, Andrew J. Jackson, Steven R. Kline, Stephane Costeux, Nitash P. Balsara

Abstract

Small-angle neutron scattering (SANS) was used to probe the phase behavior of multicomponent mixtures of supercritical carbon dioxide (scCO2), styrene-acrylonitrile random copolymer, and deuterated poly(methacrylate). Homogeneous ternary mixtures phase separated as carbon dioxide pressure (Pcod2^^) was increased at constant temperature (T). Phase separation pressure was found to be a non-monotonic function of T with a minimum at T=60 °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 and measurements of scCO2 uptake by the neat polymers. Interaction parameters follow complicated behavior with respect to T and Pcod2^^ but are shown to collapse onto a straight line when plotted as a function of scCO2 density.
Citation
Macromolecules
Volume
47
Issue
22

Keywords

Styrene-acrylonitrile random copolymer, poly(methyl methacrylate), polymer blends, supercritical carbon dioxide, small-angle neutron scattering, random phase approximation, phase behavior, thermodynamic interactions

Citation

Young, N. , Inceoglu, S. , Stone, G. , Jackson, A. , Kline, S. , Costeux, S. and Balsara, N. (2014), Thermodynamic Interactions and Phase Behavior of Multicomponent Blends Containing Supercritical Carbon Dioxide, Styrene-Acrylonitrile Random Copolymer, and Deuterated Poly(methyl methacrylate), Macromolecules, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=915994 (Accessed May 24, 2024)

Issues

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Created November 6, 2014, Updated October 12, 2021