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Open AccessArticle

Phase Behavior of a Carbon Dioxide/Methyl Trimethoxy Silane/Polystyrene Ternary System

1
Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science, Ichigaya Funakawara-machi 12-1, Shinjuku-ku, Tokyo 162-0826, Japan
2
Nanosystem Research Institute, Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan
3
Showa Jyushi Co. Ltd., Sekishinden, Yoshikawa, Saitama 342-0014, Japan
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(2), 246; https://doi.org/10.3390/polym11020246
Received: 29 December 2018 / Revised: 28 January 2019 / Accepted: 29 January 2019 / Published: 2 February 2019
(This article belongs to the Special Issue Polymer and Composite Aerogels)
Recently, polymeric foams filled with a silica aerogel have been developed. The phase behavior of CO2/silicon alkoxide binary systems and CO2/silicon alkoxide/polymer ternary systems is an important factor that affects the design of novel processes. The phase behavior of a carbon dioxide (CO2)/methyl trimethoxy silane (MTMS)/polystyrene (PS) ternary system was measured using a synthetic method involving the observation of the bubble and cloud point. The phase boundaries were measured at temperatures ranging from 313.2 to 393.2 K and CO2 weight fractions between 0.01 and 0.08. The CO2/MTMS/PS system showed a similar CO2 mass fraction dependence of the phase behavior to that observed for the CO2/tetramethyl orthosilicate (TMOS)/PS system. When the phase boundaries of these systems were compared, the vapor-liquid (VL) and vapor-liquid-liquid (VLL) lines were found to be nearly identical, while the liquid-liquid (LL) lines were different. These results indicate that the affinity between the silicon alkoxide and polymer greatly influences the liquid-liquid phase separation. View Full-Text
Keywords: vapor-liquid equilibrium; liquid-liquid equilibrium; vapor-liquid-liquid equilibrium; carbon dioxide; methyl trimethoxy silane; polystyrene; synthetic method vapor-liquid equilibrium; liquid-liquid equilibrium; vapor-liquid-liquid equilibrium; carbon dioxide; methyl trimethoxy silane; polystyrene; synthetic method
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MDPI and ACS Style

Matsukawa, H.; Yoda, S.; Okawa, Y.; Otake, K. Phase Behavior of a Carbon Dioxide/Methyl Trimethoxy Silane/Polystyrene Ternary System. Polymers 2019, 11, 246.

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