Citation: CHEN Xiuhong, HU Liuyong, QIAO Wenqiang, WANG Zhiyuan. Synthesis and Properties of Near-Infrared Electrochromic Polymers Containing Diketopyrrolopyrrole, Benzothiadiazole and Thiophene[J]. Chinese Journal of Applied Chemistry, ;2018, 35(2): 165-173. doi: 10.11944/j.issn.1000-0518.2018.02.170045 shu

Synthesis and Properties of Near-Infrared Electrochromic Polymers Containing Diketopyrrolopyrrole, Benzothiadiazole and Thiophene

CHEN Xiuhong ^a,b ,
HU Liuyong ^a,b ,
QIAO Wenqiang ^a,, ,
WANG Zhiyuan ^a,,

a.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
b.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: QIAO Wenqiang, wqqiao@ciac.ac.cn WANG Zhiyuan, wwjoy@ciac.ac.cn
Received Date: 27 February 2017
Revised Date: 6 April 2017
Accepted Date: 9 May 2017

Fund Project: Supported by the National Natural Science Foundation of China(No.21474102, No.21474105)the National Natural Science Foundation of China 21474102the National Natural Science Foundation of China 21474105

Figures(6)

Donor-acceptor type polymers are new electrochromic materials which are tunable and colorfull. However, the electrochromic properties such as optical contrast and stability need to be further improved. Low band gap conjugated polymers containing diketopyrrolopyrrole(DPP), benzothiadiazole(BTZ) and thiophen (T) were synthesized and their electrochromic properties were studied. Four polymers P1~P4 were obtained by adjusting the molar ratio of the three monomers(n(DPP):n(BTZ):n(T)=1:0:1, 1.5:0.5:1, 2:1:1 and 3:2:1, respectively). The absorption and electrochromic properties of the polymers depend on the ratios of DPP, BTZ and T units in the polymers. It was found that these polymers have high optical contrast(△T:50%~60%) and coloration efficiency(CE:300~600 cm²/C) in the near-infrared region. In particular, △T of polymer P3 reached the high value of 63% and CE of polymer P4 was 471 cm²/C at 1550 nm. The polymers containing BTZ groups have higher optical contrast at both the near-infrared(NIR) region and the maximum absorption wavelength than that of polymer P1 in which the BTZ content is zero. Polymers containing BTZ unit shows better electrochromic stability, which is attributed to its higher oxidation potential and better electrochemical stability. It provides a new way to design high-performance electrochromic polymers.
- electrochromism,
- donor-acceptor type polymers,
- spectroelectrochemistry,
- optical contrast,
- coloration efficiency,
- stability
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