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)
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
▼
Show Figures
Graphical abstract
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
MDPI and ACS Style
Otaki, M.; Kumai, R.; Sagayama, H.; Goto, H. Synthesis of Polyazobenzenes Exhibiting Photoisomerization and Liquid Crystallinity. Polymers 2019, 11, 348. https://doi.org/10.3390/polym11020348
AMA Style
Otaki M, Kumai R, Sagayama H, Goto H. Synthesis of Polyazobenzenes Exhibiting Photoisomerization and Liquid Crystallinity. Polymers. 2019; 11(2):348. https://doi.org/10.3390/polym11020348
Chicago/Turabian StyleOtaki, Masashi, Reiji Kumai, Hajime Sagayama, and Hiromasa Goto. 2019. "Synthesis of Polyazobenzenes Exhibiting Photoisomerization and Liquid Crystallinity" Polymers 11, no. 2: 348. https://doi.org/10.3390/polym11020348
Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.
