1990 Volume 47 Issue 10 Pages 817-824
Electrochromic properties of poly (o-phenylenediamine) (PPD) and poly (N-methylaniline) (PMA) films were examined. In the oxidized state, the PPD film was red (maximum absorption wavelength, λmax=490 nm) and the PMA film was bluish green (λmax=780 nm). In the reduced state, both of the films were colorless. The absorbance of the films increased with the electrolytic time. It was also able to be controlled by the electrolytic potentials. The λmax value of the films depended on the solution pH and on the dopant anions. Dual-layer films were easily prepared by electropolymerizafion and had overlapped electrochromism of those of the original layers. The PPD film showed little oxidative deterioration. Therefore, PMA/PPD and polyaniline (PAN) /PPD films were more stable in anodic treatment than original PMA and polyanilne films. The response time for coloration/decoloration of the films was 10-30 ms.
