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Multiple interaction regulated phase transition behavior of thermo-responsive copolymers containing cationic poly(ionic liquid)s

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Abstract

The effect of multiple interactions including anion–macromolecule interaction, water-mediated ion–macromolecule interaction and hydrophobic interaction on the phase transition behaviors of random copolymers P(OEGMA-co-BVIm[X]) comprising oligo(ethylene glycol)methacrylate (OEGMA) and imidazolium-based ionic liquids is investigated in the present study. Temperature-variable 1H NMR and FT-IR investigations demonstrated that the hydration of CH2 side chains in P(OEGMA-co-BVIm[SCN]) was enhanced due to the anion–dipole interaction between a chaotropic anion SCN and CH2 groups, and dehydration of C[double bond, length as m-dash]O groups served as the driving force of phase transition. In particular, the formation of C[double bond, length as m-dash]O⋯D2O–PIL hydrogen bonds was preferred in P(OEGMA-co-BVIm[SCN]) during the phase transition process considering the interaction of IL–D2O associations and C[double bond, length as m-dash]O groups. This water-mediated ion–macromolecule interaction acted as a “linkage” among polymers, resulting in the gradual dehydration of copolymers and the formation of stable small size micelles. As for P(OEGMA-co-BVIm[NTf2]), water molecules were sequentially squeezed out of the polymer chains upon heating and the self-aggregation of polymer chains was carried out through hydrophobic interaction between OEGMA side chains with IL segments wrapped in the aggregates.

Graphical abstract: Multiple interaction regulated phase transition behavior of thermo-responsive copolymers containing cationic poly(ionic liquid)s

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Publication details

The article was received on 27 Aug 2017, accepted on 30 Oct 2017 and first published on 31 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP05846B
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Multiple interaction regulated phase transition behavior of thermo-responsive copolymers containing cationic poly(ionic liquid)s

    Y. Zhang, H. Tang and P. Wu, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP05846B

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