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International Journal of Polymer Science
Volume 2018, Article ID 4541937, 10 pages
Research Article

Dielectric Properties of Azo Polymers: Effect of the Push-Pull Azo Chromophores

1Department of Chemical Engineering, Northwest University, Xi’an 710069, China
2Center for Applied Chemistry, University of Electronic Science and Technology of China, Chengdu 610054, China
3Department of Scientific Research and Development, Tsinghua University, Beijing 100084, China

Correspondence should be addressed to Renbo Wei; nc.ude.ctseu@01briew and Xiufu Hua; nc.ude.auhgnist.liam@fxauh

Received 12 December 2017; Accepted 16 January 2018; Published 12 February 2018

Academic Editor: Hossein Roghani-Mamaqani

Copyright © 2018 Xuan Zhang et al. 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.


The relationship between the structure and the dielectric properties of the azo polymers was studied. Four azo polymers were synthesized through the azo-coupling reaction between the same precursor (PAZ) and diazonium salts of 4-aminobenzoic acid ethyl ester, 4-aminobenzonitrile, 4-nitroaniline, and 2-amino-5-nitrothiazole, respectively. The precursor and azo polymers were characterized by 1H NMR, FT-IR, UV-vis, GPC, and DSC. The dielectric constant and dielectric loss of the samples were measured in the frequency range of 100 Hz–200 kHz. Due to the existence of the azo chromophores, the dielectric constant of the azo polymers increases compared with that of the precursor. In addition, the dielectric constant of the azo polymers increases with the increase of the polarity of the azo chromophores. A random copolymer (PAZ-NT-PAZ) composed of the azo polymer PAZ-NT and the precursor PAZ was also prepared to investigate the content of the azo chromophores on the dielectric properties of the azo polymers. It showed that the dielectric constant increases with the increase of the azo chromophores. The results show that the dielectric constant of this kind of azo polymers can be controlled by changing the structures and contents of azo chromophores during the preparation process.