1350929-64-4Relevant articles and documents
Substituent effect on electrochemical and electrochromic behaviors of ambipolar aromatic polyimides based on aniline derivatives
Huang, Li-Ting,Yen, Hung-Ju,Liou, Guey-Sheng
, p. 9595 - 9610 (2011)
Three series of new ambipolar polyimides containing aniline derivatives with different degree of 4-methoxyphenyl substituent showing anodically/cathodically electrochromic characteristic were prepared from the polycondensation of three diamine monomers-4,4′-bis[(4-aminophenyl)amino] diphenylamine (3), 4,4′-bis[(4-aminophenyl)amino]-4″- methoxytriphenylamine (3′), and 4,4′-bis[4-aminophenyl(4- methoxyphenyl)amino]-4″-methoxytriphenylamine (3″)-with various commercially available tetracarboxylic dianhydrides. In addition to the high glass-transition temperatures (Tg, 246-339 °C), thermal stability, and solution processability, the resulting polyimide films exhibited ambipolar electrochromic behavior. The nonconjugated TPA-based polyimides III revealed more stable electrochemical oxidation behavior and better electrochromic reversibility than conjugated DPA-based corresponding polyimides I due to the additional phenyl ring providing the route to stabilize the cation radical formed during oxidation.
