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The influence of a thermoresponsive polymer on the microdynamic phase transition mechanisms of distinctly structured thermoresponsive ionic liquids

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Abstract

The study of a ternary solution involving a thermoresponsive polymer, a thermoresponsive ionic liquid (IL), and a solvent will not only help with interpreting their distinct phase transition behavior, but also promote the development of novel thermoresponsive systems. In this paper, we investigate the influence of a conventional thermoresponsive polymer, poly(2-isopropyl-2-oxazoline) (PIPOZ), on the phase transition behavior of two thermoresponsive ILs ([P4,4,4,6][MC3S], [P4,4,4,4][SS]) with different structures. Although the addition of PIPOZ reduces the transition temperatures of both ILs, our analyses demonstrate that there exists a large difference in the microdynamic phase transition mechanisms between [P4,4,4,6][MC3S]/PIPOZ and [P4,4,4,4][SS]/PIPOZ aqueous solutions. Both PIPOZ and [P4,4,4,6][MC3S] experience unexpectedly an unusual over-hydration process before a two-step phase transition of the mixture solution, which can be explained by the presence of a new kind of intermolecular bridging hydrogen bond (IL–water–polymer), whereas only PIPOZ undergoes dehydration around the transition temperature of the [P4,4,4,4][SS]/PIPOZ aqueous solution. Further spectral analyses reveal that both [P4,4,4,6][MC3S] and PIPOZ engage in the phase separation of the ternary solution jointly, whereas PIPOZ takes part in the phase transition of [P4,4,4,4][SS]/PIPOZ solution more independently.

Graphical abstract: The influence of a thermoresponsive polymer on the microdynamic phase transition mechanisms of distinctly structured thermoresponsive ionic liquids

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Publication details

The article was received on 29 May 2017, accepted on 25 Jul 2017 and first published on 26 Jul 2017


Article type: Paper
DOI: 10.1039/C7CP03602G
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    The influence of a thermoresponsive polymer on the microdynamic phase transition mechanisms of distinctly structured thermoresponsive ionic liquids

    L. Ma, G. Wang, S. Sun and P. Wu, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP03602G

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