Enhancement of redox stability and electrochromic performance of aromatic polyamides by incorporation of (3, 6‐dimethoxycarbazol‐9‐yl)‐triphenylamine units. Issue 2 (25th November 2013) - Wang, Hui‐Min
ABSTRACT: New series aromatic polyamides with (carbazol‐9‐yl)triphenylamine units were synthesized from a newly synthesized diamine monomer, 4, 4′‐diamino‐4″‐(3, 6‐dimethoxycarbazol‐9‐yl) triphenylamine, and aromatic dicarboxylic acids via the phosphorylation polyamidation technique. These polyamides exhibit good solubility in many organic solvents and can be solution‐cast into flexible and strong films with high thermal stability. They show well‐defined and reversible redox couples during oxidative scanning, with a strong color change from colorless neutral form to yellowish green and blue oxidized forms at applied potentials scanning from 0.0 to 1.3 V. They show enhanced redox‐stability and electrochromic performance as compared to the corresponding analogs without methoxy substituents on the active sites of the carbazole unit. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 272–286 What's new?: A new series of aromatic polyamides with CzTPA units was synthesized from 4, 4′ ‐diamino‐40″‐(3, 6‐dimethoxycarbazol‐9‐yl)triphenylamine and aromatic dicarboxylic acids. The polyamides display enhanced redox stability and electrochromic performance as compared to the corresponding analogs without methoxy substituents on the active sites of the carbazole unit. The polyamide films show strong color changes from colorless to yellowish green and blue in a low switching time during oxidation, together with enhanced near‐infrared absorption, moderate coloration efficiency, and long‐term switching stability.