SII-2 ソノエマルションプロセスを用いた環境調和型電解重合(スペシャルセッションII(環境))

概要

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Water, supercritical fluid and ionic liquid have been used as alternative media for organic solvents so far. In particular, water is the most ideal medium for electrolyses from aspects of environmental pollution, safety and operational costs. However, many organic substrates are generally water-insoluble. Recently, some research groups reported that electropolymerization of monomers like thiophene derivatives having low solubility in aqueous solutions effectively proceeded using microemulsion [1,2]. This approach is quiet interesting, but the use of surfactants as emulsifying agents results in a serious problem such as the complication of its separation from polymer materials. Meanwhile, it is well known that ultrasonic dispersion provides stable emulsion in an aqueous medium [3]. Furthermore, droplets size go up to nano scale. Therefore, a direct electron transfer between an electrode and droplets can be expected. In this work, we carried out electropolymerization of 3,4-ethylenedioxythiophene (EDOT) as a thiophene derivative from an aqueous solution emulsified by ultrasonication without any surfactant. As a result, the electropolymerization of EDOT proceeded smoothly by this method. In addition, it is found that large grains were deposited on the anode substrate.
2004-11-11