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Issue 11, 2016
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Shape-switching self-assembly of new diblock copolymers with UCST-type and LCST-type segments in water

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Abstract

A dual thermosensitive behavior, i.e., self-assembly at both high and low temperatures, was achieved in water using vinyl ether block copolymers with imidazolium salt side-chains (exhibiting a UCST behavior) and oxyethylene side-chains (exhibiting an LCST behavior). The block copolymers were precisely prepared via living cationic polymerization in the presence of a weak Lewis base. They formed micelles at lower temperatures and vesicles at higher temperatures in water, as confirmed via UV-Vis spectroscopy, dynamic light scattering (DLS), static light scattering (SLS), variable temperature 1H NMR, and fluorescence measurements using pyrene as a polarity-sensitive probe. Furthermore, concentrated aqueous solutions of the block copolymers underwent sol–gel transitions by either raising or lowering the temperature.

Graphical abstract: Shape-switching self-assembly of new diblock copolymers with UCST-type and LCST-type segments in water

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Publication details

The article was received on 12 Dec 2015, accepted on 01 Feb 2016 and first published on 01 Feb 2016


Article type: Paper
DOI: 10.1039/C5PY01976A
Citation: Polym. Chem., 2016,7, 2062-2068
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    Shape-switching self-assembly of new diblock copolymers with UCST-type and LCST-type segments in water

    H. Yoshimitsu, E. Korchagina, A. Kanazawa, S. Kanaoka, F. M. Winnik and S. Aoshima, Polym. Chem., 2016, 7, 2062
    DOI: 10.1039/C5PY01976A

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