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

Authors
Lopes, JA Gourgouillon, D Pereira, PJ Ramos, AM da Ponte, MN
Citation
Ja. Lopes et al., On the effect of polymer fractionation on phase equilibrium in CO2 + poly(ethylene glycol)s systems, J SUPERCR F, 16(3), 2000, pp. 261-267
Citations number
11
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
JOURNAL OF SUPERCRITICAL FLUIDS
ISSN journal
08968446 → ACNP
Volume
16
Issue
3
Year of publication
2000
Pages
261 - 267
Database
ISI
SICI code
0896-8446(20000115)16:3<261:OTEOPF>2.0.ZU;2-H
Abstract
Phase equilibrium ratios of poly(ethylene glycol)s (PEG) of average molar m asses 200, 400 and 600 with supercritical CO2, were measured at 20 MPa and 313 K. Additional measurements with the monomer, ethylene glycol and with P EG 400 at 293 K were also performed. Three different methods of analysing t he PEG amounts in each phase were used. Using a size exclusion chromatograp hy procedure (SEC/GPC) we have observed a relevant fractionation of the pol ymer in the case of the system CO2 + PEG 600. Some of the results obtained differ significantly from previously published values on the same systems. (C) 2000 Elsevier Science B.V. All rights reserved.