還元型ポリアニリンを透明高分子フィルムで封入した材料の色調の経時変化
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A conductive polymer polyaniline was prepared easily on a transparent indium-tin oxide (ITO) electrode as a stable film by oxidative electropolymerization of aniline (0.5 mol/L) in 0.5 mol/L H2SO4 aqueous solution. To obtain colorless reduced polyaniline, the polyaniline film-covered ITO electrode was polarized at -0.2 V vs. Ag/AgClin 0.5 mol/L H2SO4 aqueous solution until the cathodic current reached the background value. Five-time indicative materials were prepared by enclosing the reduced polyaniline film in the five types of common transparent polymer films. To consider the oxygen permeability coefficient and the thickness, the following common transparent polymer films were used: low-density polyethylene (LDPE) films with 0.03 and 0.08 mm thickness, high-density polyethylene (HDPE) films with 0.01 and 0.03 mm thickness, and polypropylene (PP) film with 0.026 mm thickness. The color change of the materials was colorless - violet-bluish - violet-blackish - violet. The reduced polyaniline films enclosed in 0.03 mm-thick LDPE and 0.026 mm-thick PP films are useful as 10-day indicative materials. However, that enclosed in 0.01 mm-thick HDPE was applicable to about 30-day indicative one. Those enclosed in 0.03 mm-thick HDPE and 0.08 LDPE films are expected to be longer time-indicative materials. This approach to preparing time-indicative materials can be used with other poly(aniline derivatives) with color changes differing from those of polyaniline and transparent polymer films with different oxygen permeability coefficients and thickness.
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