Substituent Effect on Electrochemical and Electrochromic Behaviors of Ambipolar Aromatic Polyimides Based on Aniline Derivatives

作者：Huang Li Ting; Yen Hung Ju; Liou Guey Sheng^*

来源：Macromolecules, 2011, 44(24): 9595-9610.

DOI：10.1021/ma202128e

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 (T-g, 246-339 degrees 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.

• 出版日期2011-12-27