Hierarchical Sol–Gel Transition Induced by Thermosensitive Self-Assembly of an ABC Triblock Polymer in an Ionic Liquid
| Autor: | Timothy P. Lodge, Lucas D. McIntosh, Satoru Imaizumi, Kazuyuki Niitsuma, Saki Tamura, Takeshi Ueki, Yuzo Kitazawa, Masayoshi Watanabe |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Organic Chemistry 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Methacrylate 01 natural sciences Lower critical solution temperature Micelle 0104 chemical sciences Inorganic Chemistry chemistry.chemical_compound chemistry Phase (matter) Polymer chemistry Ionic liquid Materials Chemistry Copolymer Methyl methacrylate 0210 nano-technology |
| Zdroj: | Macromolecules. 49:1414-1423 |
| ISSN: | 1520-5835 0024-9297 |
| Popis: | 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 jamme... |
| Databáze: | OpenAIRE |
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