Controlling the formation of ionic-liquid-based aqueous biphasic systems by changing the hydrogen-bonding ability of polyethylene glycol end groups

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorPereira, Jorge F. B.
dc.creatorKurnia, Kiki A.
dc.creatorFreire, Mara G.
dc.creatorCoutinho, João A. P.
dc.creatorRogers, Robin D.
dc.date2015-12-07T15:33:46Z
dc.date2016-10-25T21:23:14Z
dc.date2015-12-07T15:33:46Z
dc.date2016-10-25T21:23:14Z
dc.date2015
dc.date.accessioned2017-04-06T09:29:20Z
dc.date.available2017-04-06T09:29:20Z
dc.identifierChemphyschem, v. 16, n. 10, p. 2219-2225, 2015.
dc.identifier1439-7641
dc.identifierhttp://hdl.handle.net/11449/131314
dc.identifierhttp://acervodigital.unesp.br/handle/11449/131314
dc.identifier10.1002/cphc.201500146
dc.identifier25943332
dc.identifierhttp://dx.doi.org/10.1002/cphc.201500146
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/941854
dc.descriptionThe formation of aqueous biphasic systems (ABS) when mixing aqueous solutions of polyethylene glycol (PEG) and an ionic liquid (IL) can be controlled by modifying the hydrogen-bond-donating/-accepting ability of the polymer end groups. It is shown that the miscibility/immiscibility in these systems stems from both the solvation of the ether groups in the oxygen chain and the ability of the PEG terminal groups to preferably hydrogen bond with water or the anion of the salt. The removal of even one hydrogen bond in PEG can noticeably affect the phase behavior, especially in the region of the phase diagram in which all the ethylene oxide (EO) units of the polymeric chain are completely solvated. In this region, removing or weakening the hydrogen-bond-donating ability of PEG results in greater immiscibility, and thus, in a higher ability to form ABS, as a result of the much weaker interactions between the IL anion and the PEG end groups.
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.languageeng
dc.publisherWiley-VCH Verlag GmbH & Co. KGaA, Weinheim
dc.relationChemphyschem
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectAqueous biphasic systems
dc.subjectHydrogen bonding
dc.subjectIonic liquids
dc.subjectPolyethylene glycol
dc.subjectPolymers
dc.titleControlling the formation of ionic-liquid-based aqueous biphasic systems by changing the hydrogen-bonding ability of polyethylene glycol end groups
dc.typeOtro


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