Phase equilibria of poly(methyl methacrylate) in supercritical mixtures of carbon dioxide and chlorodifluoromethane

被引:13
作者
Lee, BC [1 ]
Kim, NI [1 ]
机构
[1] Hannam Univ, Dept Chem Engn, Taeduk Gu 306791, Daejeon, South Korea
关键词
poly(methyl methacrylate); carbon dioxide (CO2); chlorodifluoromethane (HCFC-22); cloud point; supercritical;
D O I
10.1007/BF02706886
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Phase behavior data are presented for poly(methyl methacrylate) (PMMA: M-w= 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% (on a polymer-free basis) and at temperatures up to about 100degreesC. 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 with increasing the molecular weight of PMMA.
引用
收藏
页码:132 / 138
页数:7
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