Solubilities of poly(ethylene glycol)s in the mixtures of supercritical carbon dioxide and cosolvent |
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| Institution: | 1. Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Nankai District, Tianjin 300072, China;1. Graduate School of Science & Engineering, Ehime University, 3 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan;2. National Institute of Technology, Kagawa College, 551 Koda, Takuma-cho, Mitoyo, Kagawa 769-1192, Japan;1. Yonsei University Health System, Seoul, Republic of Korea;2. Ewha Womans University, Seoul, Republic of Korea |
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| Abstract: | The solubilities of poly(ethylene glycol) (PEG6000) (M.W.=7500) in the mixtures consisting of supercritical carbon dioxide (CO2) and cosolvent have been measured by observing the cloud points at 313.15 K and 16 MPa. Ethanol and toluene were used as cosolvents. The solubility of PEG6000 is extremely low in either CO2 or ethanol, but becomes about 20 wt.% in a mixture of the two. The maximum solubility is achieved at about 50 wt.% (polymer-free) ethanol. The solubilities of PEG6000 in the mixtures of supercritical CO2 and the cosolvent have been correlated by a regular solution model using the local compositions of solvents around a solute molecule, and an expanded liquid equation of state model. |
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