A Conjugated Copolymer Bearing Imidazolium-based Ionic Liquid: Electrochemical Synthesis and Electrochromic Properties

Xiao-Jing Lv; Li-Bin Xu; Liang Qian; Yuan-Yuan Yang; Zhi-Yi Xu; Jin Li; Cheng Zhang

doi:10.1007/s10118-021-2525-z

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A Conjugated Copolymer Bearing Imidazolium-based Ionic Liquid: Electrochemical Synthesis and Electrochromic Properties

ARTICLE | Updated：2020-11-25

- A Conjugated Copolymer Bearing Imidazolium-based Ionic Liquid: Electrochemical Synthesis and Electrochromic Properties
- Chinese Journal of Polymer Science Vol. 39, Issue 5, Pages: 537-544(2021)
- Affiliations：
  
  International Sci. & Tech. Cooperation Base of Energy Materials and Application, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
- Author bio：
  
  czhang@zjut.edu.cn
- Funds：
- DOI：10.1007/s10118-021-2525-z
  CLC：
- Received：09 September 2020，
  
  Revised：2020-10-24，
  
  Accepted：02 November 2020，
  
  Online First：25 November 2020，
  
  Published：01 January 2021
- Accepted：
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Lv, X. J.; Xu, L. B.; Qian, L.; Yang, Y. Y.; Xu, Z. Y.; Li, J.; Zhang, C. A conjugated copolymer bearing imidazolium-based ionic liquid: electrochemical synthesis and electrochromic properties. Chinese J. Polym. Sci. 2021, 39, 537–544

Xiao-Jing Lv, Li-Bin Xu, Liang Qian, et al. A Conjugated Copolymer Bearing Imidazolium-based Ionic Liquid: Electrochemical Synthesis and Electrochromic Properties[J]. Chinese Journal of Polymer Science, 2021, 39(5): 537-544.
Lv, X. J.; Xu, L. B.; Qian, L.; Yang, Y. Y.; Xu, Z. Y.; Li, J.; Zhang, C. A conjugated copolymer bearing imidazolium-based ionic liquid: electrochemical synthesis and electrochromic properties. Chinese J. Polym. Sci. 2021, 39, 537–544 DOI： 10.1007/s10118-021-2525-z.

Xiao-Jing Lv, Li-Bin Xu, Liang Qian, et al. A Conjugated Copolymer Bearing Imidazolium-based Ionic Liquid: Electrochemical Synthesis and Electrochromic Properties[J]. Chinese Journal of Polymer Science, 2021, 39(5): 537-544. DOI： 10.1007/s10118-021-2525-z.

摘要

Abstract

An imidazolium-based ionic liquid (IL) modified triphenylamine derivative

namely 1-(4-((4-(diphenylamino)benzoyl) oxy)butyl)-3-methyl imidazole tetrafluoroborate (TPAC

IL-BF

)

was designed and synthesized

and further applied with 3

4-ethylene dioxythiophene (EDOT) to prepare conjugated copolymer P(EDOT:TPAC

IL-BF

)

via

electrochemical polymerization. The cyclic voltammetry curves show that the copolymer P(EDOT:TPAC

IL-BF

) possesses two pairs of redox peaks

which should be ascribed to the redox behaviors of EDOT and triphenylamine. The ultraviolet-visible (UV-Vis) absorption spectrum of P(EDOT:TPAC

IL-BF

) exhibits one maximum absorption peak at 580 nm and a small shoulder characteristic peak at 385 nm under neutral state which are assigned to

conjugated structure of EDOT and triphenylamine. After being applied at the positive voltage

the copolymer color changes from dark blue to light blue

which is close to the color of poly(3

4-ethylenedioxythiophene) (PEDOT). Surprisingly

the copolymer P(EDOT:TPAC

IL-BF

) shows shorter switching time of 0.37 s

0.30 s at 580 nm and 0.38 s

0.45 s at 1100 nm compared with PEDOT. It is more intriguing that the copolymer P(EDOT:TPAC

IL-BF

) exhibits electrochromism even in free supporting electrolyte. The results confirm that the existence of imidazolium-based ionic liquid has an improvement on the ion diffusion properties and the switching time of conjugated polymer

which may provide a potential direction for the preparation of high-performance electrochromic materials.

关键词

Keywords

references

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