On the effect of polymer fractionation on phase equilibrium in CO2+poly(ethylene glycol)s systems

✍ Scribed by J.A. Lopes; D. Gourgouillon; P.J. Pereira; A.M. Ramos; M. Nunes da Ponte

• Book ID: 104351732
• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 123 KB
• Volume: 16
• Category: Article
• ISSN: 0896-8446
• DOI: 10.1016/s0896-8446(99)00033-9

✦ Synopsis

Phase equilibrium ratios of poly(ethylene glycol )s (PEG) of average molar masses 200, 400 and 600 with supercritical CO 2 , were measured at 20 MPa and 313 K. Additional measurements with the monomer, ethylene glycol and with PEG 400 at 293 K were also performed. Three different methods of analysing the PEG amounts in each phase were used. Using a size exclusion chromatography procedure (SEC/GPC ) we have observed a relevant fractionation of the polymer in the case of the system CO 2 +PEG 600. Some of the results obtained differ significantly from previously published values on the same systems.