Enzymatic Synthesis of Electroconductive Polyaniline in the Presence of Anionic Soft Interfaces as Reaction Templates

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  • Kashima Keita
    National Institute of Technology, Oyama College (Oyama KOSEN)

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Other Title
  • アニオン性ソフト界面をテンプレートとした酵素反応による 導電性ポリアニリンの合成
  • アニオンセイ ソフト カイメン オ テンプレート ト シタ コウソ ハンノウ ニ ヨル ドウデンセイ ポリアニリン ノ ゴウセイ

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Description

Polyaniline in its conductive emeraldine salt form (PANI–ES) has good dispersibility in water phase, thermal and radiation stability. The enzymatic oxidation of aniline or aniline dimer ( p–aminodiphenylamine, PADPA), in the presence of dispersed anionic soft–interfaces– also called “templates”– in slightly acidic aqueous solution is expected as environmentally–friendly process for PANI–ES production. Without templates, these products do not form. Laccase/O2–catalized synthesis of PANI–ES in the presence of sodium bis(2–ethylhexyl)sulfosuccinate (AOT) vesicles as templates is advantageous in its simple procedure, and low concentration of required enzyme. The effect of four different templates under their respective optimal conditions was investigated and compared in a systematic way. The templates used were sulfonated polystyrene (SPS), micelles from sodium dodecylbenzenesulfonate (SDBS), vesicles from SDBS/decanoic acid (DA) and vesicles from AOT. Although all four templates carry a sulfonate group and yield PANI–ES–type products, there are clear differences in the properties of the product mixtures obtained. AOT vesicles performed as the best template in the viewpoint of produced amount and chemical stability of polarons (radical cations) in PANI–ES–like products.

Journal

  • MEMBRANE

    MEMBRANE 46 (2), 71-77, 2021

    THE MEMBRANE SOCIETY OF JAPAN

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