Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/20707
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dc.contributor.authorClaudio, Ana Filipa M.pt
dc.contributor.authorPereira, Jorge F. B.pt
dc.contributor.authorMcCrary, Parker D.pt
dc.contributor.authorFreire, Mara G.pt
dc.contributor.authorCoutinho, Joao A. P.pt
dc.contributor.authorRogers, Robin D.pt
dc.date.accessioned2017-12-07T19:56:35Z-
dc.date.issued2016pt
dc.identifier.issn1463-9076pt
dc.identifier.urihttp://hdl.handle.net/10773/20707-
dc.description.abstractAn extensive study on the formation of aqueous biphasic systems (ABS) using aqueous solutions of protic ionic liquids (PILs) and polyethylene glycol (PEG) was performed in order to understand the mechanisms underlying the phase separation. Aqueous solutions of PEG polymers with different molecular weights (600, 1000, 2000, and 3400 g mol(-1)) and several N-alkyl-, dialkyl-, and trialkyl-ammonium salts of acetate, propanoate, butanoate, hexanoate and octanoate were prepared and their ability to form ABS at several temperatures assessed. The ternary liquid-liquid phase diagrams were determined at several temperatures, as well as binary PIL (or salt)-PEG-1000 and salt-water solubility data to better clarify the mechanisms responsible for the phase separation. All data gathered indicate that the formation of PEG-PIL-based ABS is mainly governed by the PIL-PEG mutual interactions, where PILs with a higher solubility in the polymer exhibit a lower aptitude to form ABS displaying thus a smaller biphasic region, for which a direct correlation was identified. The effects of the molecular weight and temperature of the polymer were also addressed. The increase of the PEG hydrophobicity or molecular weight favours the phase separation, whereas the effect of temperature was found to be more complex and dependent on the nature of the PIL, with an increase or decrease of the biphasic regime with an increase in temperature.pt
dc.language.isoengpt
dc.publisherROYAL SOC CHEMISTRYpt
dc.relationinfo:eu-repo/grantAgreement/FCT/5876/147332/PTpt
dc.relationinfo:eu-repo/grantAgreement/FCT/COMPETE/132936/PTpt
dc.relationinfo:eu-repo/grantAgreement/EC/FP7/337753/EUpt
dc.rightsrestrictedAccesspor
dc.subjectCHOLINIUM-BASED SALTSpt
dc.subject2-PHASE SYSTEMSpt
dc.subjectPHASE-BEHAVIORpt
dc.subjectBINARY-MIXTURESpt
dc.subjectPOLYMERSpt
dc.subjectWATERpt
dc.subjectTEMPERATUREpt
dc.subjectEXTRACTIONpt
dc.subjectSEPARATIONpt
dc.subjectHYDROPHOBICITYpt
dc.titleA critical assessment of the mechanisms governing the formation of aqueous biphasic systems composed of protic ionic liquids and polyethylene glycolpt
dc.typearticlept
dc.peerreviewedyespt
ua.distributioninternationalpt
degois.publication.firstPage30009pt
degois.publication.issue43pt
degois.publication.lastPage30019pt
degois.publication.titlePHYSICAL CHEMISTRY CHEMICAL PHYSICSpt
degois.publication.volume18pt
dc.date.embargo10000-01-01-
dc.relation.publisherversion10.1039/c6cp06289jpt
dc.identifier.doi10.1039/c6cp06289jpt
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