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Phase equilibria of poly(methyl methacrylate) in supercritical mixtures of carbon dioxide and chlorodifluoromethane
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lee, Byung-Chul Kim, Nam-Il |
| Copyright Year | 2002 |
| 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% (on a polymer-free basis) and at temperatures up to about 100 °C. 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. |
| Starting Page | 132 |
| Ending Page | 138 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.1007/BF02706886 |
| Volume Number | 19 |
| Alternate Webpage(s) | https://www.cheric.org/PDF/KJChE/KC19/KC19-1-0132.pdf |
| Alternate Webpage(s) | https://doi.org/10.1007/BF02706886 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
