Influence of crystalline and amorphous microscopic morphology on the capacitance performance and electrochromic phenomenon of triazine-based polyimides

  • Ziyu Li
  • Kaichang KouEmail author
  • Guanglei WuEmail author
  • Dan Li
  • Jing Xue


In this paper, two series of polyimides TPI-Ns and TPI-Ds containing triazines were prepared using NMP and DMF as precursor solvents respectively. Through the characterization of XRD, FT-IR and SEM, it was found that the secondary structures of the two types of TPIs were significantly different. The former shows a higher crystallinity while the latter shows an amorphous state. The two types of polyimides were respectively prepared into gel polymer electrolytes (GPEs) and applied to capacitor devices with ITO as the electrode. It was shown that the charge–discharge rate of the two types of devices differed significantly with the concentration of TPI added in GPEs system. Compared with the former, the latter showed a stronger linear correlation, and the equation of the relationship between charge and discharge time t and TPI addition quantity c was fitted. In addition, it was found that the electrochromic device prepared with TPI-D-2 as the active layer could change the color between white, amaranth (coloring state) and green (fading state) with additional voltage (< 4.5 V) was applied. All the above indications show that the short-range ordered structure of TPIs can affect its microscopic morphology and is directly related to its capacitance performances and electrochromic activity.



This work was financially supported by the National Natural Science Foundation of China (No. 51407134), China Postdoctoral Science Foundation (No. 2016M590619), Natural Science Foundation of Shandong Province (No. ZR2019YQ24), The Qingdao Postdoctoral Application Research Project and Key Laboratory of Engineering Dielectrics and Its Application (Harbin University of Science and Technology), Ministry of Education. The authors acknowledge the support from The Thousand Talents Plan, The World-Class University and Discipline, The Taishan Scholar’s Advantageous and Distinctive Discipline Program of Shandong Province and The World-Class Discipline Program of Shandong Province.


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Authors and Affiliations

  1. 1.Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Natural and Applied SciencesNorthwestern Polytechnical UniversityXi’anPeople’s Republic of China
  2. 2.Institute of Materials for Energy and Environment, State Key Laboratory of Bio-fibers and Eco-textiles, College of Materials Science and EngineeringQingdao UniversityQingdaoPeople’s Republic of China

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