Controlling the Formation of Ionic-Liquid-based Aqueous Biphasic Systems by Changing the Hydrogen-Bonding Ability of Polyethylene Glycol End Groups
authors Pereira, JFB; Kurnia, KA; Freire, MG; Coutinho, JAP; Rogers, RD
nationality International
journal CHEMPHYSCHEM
author keywords aqueous biphasic systems; hydrogen bonding; ionic liquids; polyethylene glycol; polymers
keywords CHOLINIUM-BASED SALTS; 2-PHASE SYSTEMS; MIXTURES; POLYMERS; BOOST
abstract The 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.
publisher WILEY-V C H VERLAG GMBH
issn 1439-4235
year published 2015
volume 16
issue 10
beginning page 2219
ending page 2225
digital object identifier (doi) 10.1002/cphc.201500146
web of science category Chemistry, Physical; Physics, Atomic, Molecular & Chemical
subject category Chemistry; Physics
unique article identifier WOS:000357943900023
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journal analysis (jcr 2017):
journal impact factor 2.947
5 year journal impact factor 2.950
category normalized journal impact factor percentile 64.892
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