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| Azevedo, Nuno Monteiro |
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Ueki, Takeshi
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Publications (5/5 displayed)
- 2016Hierarchical Sol-Gel Transition Induced by Thermosensitive Self-Assembly of an ABC Triblock Polymer in an Ionic Liquidcitations
- 2015Thermally Reversible Ion Gels with Photohealing Properties Based on Triblock Copolymer Self-Assemblycitations
- 2015Photoreversible gelation of a triblock copolymer in an ionic liquidcitations
- 2012Light-controlled reversible micellization of a diblock copolymer in an ionic liquidcitations
- 2011UCST phase transition of azobenzene-containing random copolymer in an ionic liquidcitations
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article
Hierarchical Sol-Gel Transition Induced by Thermosensitive Self-Assembly of an ABC Triblock Polymer in an Ionic Liquid
Abstract
<p>We investigated a hierarchical morphology change and accompanying sol-gel transition using a doubly thermosensitive ABC-triblock copolymer in an ionic liquid (IL). The triblock copolymer contains two different lower critical solution temperature (LCST) thermosensitive polymers, poly(benzyl methacrylate) (PBnMA) and poly(2-phenylethyl methacrylate) (PPhEtMA), as the end blocks and poly(methyl methacrylate) (PMMA) as the middle block (PBnMA-b-PMMA-b-PPhEtMA: BMP). BMP undergoes a hierarchical phase transition corresponding to the self-assembly of each of the thermosensitive blocks in the IL, and a sol-gel transition was observed in concentrated, above 10 wt %, polymer solutions. The gelation behavior was affected by polymer concentration, and at 20 wt %, the BMP/IL composite showed a phase transition, with increasing temperature, from solution through a jammed micelle suspension to a physically cross-linked gel. Each phase was formed reversibly and rapidly over the corresponding temperature range. The jammed micelle and cross-linked gel states were characterized using viscoelastic measurements and small-angle X-ray scattering (SAXS).</p>