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Synthesis of Polyazobenzenes Exhibiting Photoisomerization and Liquid Crystallinity

1
Department of Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
2
Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(2), 348; https://doi.org/10.3390/polym11020348
Received: 7 January 2019 / Revised: 9 February 2019 / Accepted: 12 February 2019 / Published: 17 February 2019
(This article belongs to the Collection Design and Synthesis of Polymers)
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Abstract

While only a few studies have investigated the synthesis of main chain-type polyazobenzenes, they continue to draw an increasing amount of attention owing to their industrial applications in holography, dyes, and functional adhesives. In this study, dibromoazobenzene was prepared as a monomer for constructing azo-based π-conjugated polymers. Miyaura–Suzuki cross-coupling polymerization was conducted to develop copolymers containing an azobenzene unit as a photoisomerization block and a pyrimidine-based liquid crystal generator block. The prepared polymers exhibited thermotropic liquid crystallinity and underwent cis and trans photoisomerization upon irradiation with ultraviolet and visible light. Furthermore, the photoisomerization behavior was examined using optical absorption spectroscopy and synchrotron X-ray diffraction spectrometry. View Full-Text
Keywords: Miyaura–Suzuki coupling; photo-isomerization; liquid crystal; synchrotron XRD. Miyaura–Suzuki coupling; photo-isomerization; liquid crystal; synchrotron XRD.
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Otaki, M.; Kumai, R.; Sagayama, H.; Goto, H. Synthesis of Polyazobenzenes Exhibiting Photoisomerization and Liquid Crystallinity. Polymers 2019, 11, 348.

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