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Received May 22, 2001
Accepted July 2, 2001
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Phase Equilibria of Poly(methyl methacrylate) in Supercritical Mixtures of Carbon Dioxide and Chlorodifluoromethane
Department of Chemical Engineering, Hannam University, 133 Ojung-dong, Taeduk-gu, Daejeon 306-791, Korea
bclee@mail.hannam.ac.kr
Korean Journal of Chemical Engineering, January 2002, 19(1), 132-138(7), 10.1007/BF02706886
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Abstract
Phase behavior data are presented for poly(methyl methacrylate) (PMMA: Mw=15,000, 120,000) in supercritical solvent mixtures of carbon dioxide (CO2) and chlorodifluoromethane (HCFC-22). Experimental cloud point curves, which were the phase boundaries between single and liquid-liquid phases, were measured by using a high-pressure equilibrium apparatus equipped with a variable-volume view cell at various CO2 compositions up to about 63 wt%_x000D_
(on a polymer-free basis) and at temperatures up to about 100 oC. The cloud point curves exhibited the characteristics of a lower critical solution temperature phase behavior. As the CO2 content in the solvent mixture increased, the cloud point pressure at a fixed temperature increased significantly. Addition of CO2 to HCFC-22 caused a lowering of the dissolving power of the mixed solvent due to the decrease of the solvent polarity. The cloud point pressure increased_x000D_
with increasing the molecular weight of PMMA.
Keywords
References
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