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Azobenzene-functionalized polymers by ring-opening metathesis polymerization for high dielectric and energy storage performance

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Abstract

Block copolymers with push–pull azobenzene pendants were synthesized by ring-opening metathesis polymerization, and could self-assemble into core–shell nanostructures with high dipolar and interfacial polarizations, which were contributed by the strong polarity of azobenzene pendants bearing both electron-donating pyrrolidine and electron-withdrawing trifluoromethyl or nitro groups, and by the unique nanostructure of polymers, respectively. A block copolymer exhibited a high dielectric constant of 19.1 and a low dielectric loss of 0.01–0.02 at 102–106 Hz, and a high energy density of 5.54 J cm−3 at an electric field of 240 MV m−1 with an energy conversion efficiency of 82.1%. Additionally, the dielectric constant of polymers could be regulated by photoisomerization of azobenzene groups. Besides, polymers displayed an excellent thermal stability with a high thermal degradation temperature of above 300 °C and a high glass-transition temperature of over 200 °C. Therefore, polymers have promising applications in dielectric and electrical energy storage materials.

Graphical abstract: Azobenzene-functionalized polymers by ring-opening metathesis polymerization for high dielectric and energy storage performance

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Publication details

The article was received on 30 Jan 2019, accepted on 08 Apr 2019 and first published on 08 Apr 2019


Article type: Paper
DOI: 10.1039/C9PY00151D
Citation: Polym. Chem., 2019, Advance Article

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    Azobenzene-functionalized polymers by ring-opening metathesis polymerization for high dielectric and energy storage performance

    Y. Zhu, C. Ma, H. Han, R. Sun, X. Liao and M. Xie, Polym. Chem., 2019, Advance Article , DOI: 10.1039/C9PY00151D

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