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《高分子科学(英文版)》 2016-09
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Synthesis and Electrochromic Properties of Polyimides with Pendent Benzimidazole and Triphenylamine Units

Wan-an Cai;Ji-wei Cai;Hai-jun Niu;Tian-di Xiao;Xu-duo Bai;Cheng Wang;Yan-hong Zhang;Wen Wang;Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Department of Macromolecular Science and Engineering, School of Chemical, Chemical Engineering and Materials, Heilongjiang University;School of Material Science and Engineering, Harbin Institute of Technology;  
Five novel near-infrared electrochromic aromatic polyimides(PIs) with pendent benzimidazole group were synthesized from 4,4'-diamino-4''-(1-benzylbenzimidazol-2-yl)triphenylamine(named as DBBT) with five different dianhydrides via two-step polymerization process, respectively. The maximum UV-Vis absorption bands of these PIs locate at about 335 nm for solid films due to the π-π* transitions. A reversible pair of distinct redox peaks, that were associated with a noticeable color change from original yellow to blue, was observed in the cyclic voltammetry(CV) test. A new absorption peak emerged at 847 nm in near-infrared(NIR) region with increasing voltage in UV-Vis-NIR spectrum, which indicates that PI can be used as NIR electrochromic material. These novel PIs have good electrochemical stability, appropriate energy levels for the highest occupied molecular orbital(HOMO) and the lowest unoccupied molecular orbital(LUMO), in the range of-5.17 e V to-5.20 e V and-2.14 e V to-2.26 e V(versus the vacuum level) determined by cyclic voltammetry method. These values basically consisted with the results of quantum chemical calculation. These polyimides can be used as novel electrochromic and hole transportation materials.
【Fund】: financially supported by the National Natural Science Foundation of China(Nos.51373049 51372055 21372067 21206034 51303045 and 51473046);; Doctoral Fund of Ministry of Education of China(Nos.20132301120004 and 20132301110001);; Reserve Talented Person of Harbin(No.2015RAXXJ015)
【CateGory Index】: TQ323.7
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