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A comparative study of redox-active, ambipolar electrochromic triphenylamine-based polyimides prepared by electrochemical polymerization and conventional polycondensation methods

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Abstract

N,N′-Bis(4-diphenylaminophenyl)pyromellitimide (TPA-PMDI) was synthesized from the condensation reaction of 4-aminotriphenylamine with pyromellitic dianhydride (PMDA). The triphenylamine-diimide TPA-PMDI could be electrochemically polymerized into ambipolar, redox-active polyimide films on the electrode surface in an electrolyte solution via the coupling reactions between triphenylamine radical cations. The electro-generated polyimide films (coded as PI-E) exhibit reversible redox processes and stable color changes upon electro-oxidation, changing from a colorless neutral form to orange-yellowish and blue oxidized states. The film could also display pale green and pink cathodic coloring upon electro-reduction. Electrochromic devices using the electropolymerized film as an active layer were also fabricated as preliminary investigations for electrochromic applications. For a comparative study, a structurally similar polyimide (PI-C) was prepared by a conventional two-step condensation from N,N′-bis(4-aminophenyl)-N,N′-diphenyl-4,4′-biphenyldiamine with PMDA, and its spectroscopic, electrochemical and electrochromic properties were compared with those of the electro-synthesized PI-E.

Graphical abstract: A comparative study of redox-active, ambipolar electrochromic triphenylamine-based polyimides prepared by electrochemical polymerization and conventional polycondensation methods

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Publication details

The article was received on 11 Nov 2017, accepted on 05 Dec 2017 and first published on 05 Dec 2017


Article type: Paper
DOI: 10.1039/C7PY01897E
Citation: Polym. Chem., 2018, Advance Article
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    A comparative study of redox-active, ambipolar electrochromic triphenylamine-based polyimides prepared by electrochemical polymerization and conventional polycondensation methods

    S. Hsiao, W. Liao and G. Liou, Polym. Chem., 2018, Advance Article , DOI: 10.1039/C7PY01897E

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