Electroactive (A3+B2)-type hyperbranched polyimides with highly stable and multistage electrochromic behaviors. (1st December 2017)

• Record Type: Journal Article
• Authors: Sun, Ningwei; Meng, Shiyao; Zhou, Ziwei; Chao, Danming; Yu, Ye; Su, Kaixin; Wang, Daming; Zhao, Xiaogang; Zhou, Hongwei; Chen, Chunhai
• Is Part Of: Electrochimica acta. Volume 256(2017)
• Page Start: 119
• Page End: 128
• Publication Date: 2017-12-01
• Subjects: HBPIs -- Triphenylamine -- Multi-electrochromism; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.10.036
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Novel hyperbranched polyimides with star-shaped triphenylamine were synthesized, which exhibited multistage visible/near-infrared electrochromic and supercapacitive properties. Abstract: Multicolored electrochromic materials have attracted intense attentions due to their diverse smart applications. In this work, we demonstrate a facile strategy to realize multistage visible/near-infrared (vis/NIR) electrochromism by designing and synthesizing two kinds of novel hyperbranched polyimides (HBPIs) from a novel triamine as an A3 monomer and two dianhydrides as B2 monomers. The resulting HBPIs exhibit excellent solubility and thermostability. Cyclic voltammograms of the HBPIs films reveal four reversible redox couples along with five color conversions (colorless-yellow-red-indigo-black). Furthermore, the HBPIs exhibit superb electrochromic performances including continuous modulation over the entire visible region, short response time, high optical contrast, high coloration efficiency, excellent switching stability and long-term optical memory. Accordingly, these HBPIs are promising materials in the applications of electrochromism and even endowing difunctionality combining with supercapacitance.