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

Published

November 7, 2014

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 (P_cod2^^) 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 P_cod2^^ but are shown to collapse onto a straight line when plotted as a function of scCO₂ density.

Citation

Macromolecules

Volume

47

Issue

22

Pub Type

Journals

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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 October 11, 2025)