Direct measurement and mechanism of electro-chemomechanical expansion and contraction in polypyrrole films
Direct measurement and mechanism of electro-chemomechanical expansion and contraction in polypyrrole films
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DOI：
10.1143/jjap.39.5918
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发表时间：
2000-10-01
期刊：
影响因子：
--
通讯作者：
Takashima, W
中科院分区：
文献类型：
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作者：
Kaneto, K;Sonoda, Y;Takashima, W
由吡咯在对苯酚磺酸（PPS）酸电解质中电化学合成的聚吡咯薄膜的电化学机械膨胀和收缩已在各种支持电解质中直接测量。结果发现，薄膜在pH4至pH10的宽pH范围内以及在当前条件下研究的还原态和氧化态下均保持高电化学机械活性和电导率。聚吡咯薄膜的电化学机械膨胀主要由大体积离子的插入驱动，无论氧化和还原如何。这与聚苯胺薄膜的机理不同，聚苯胺薄膜涉及聚合物结构的构象变化。考虑到聚吡咯的导电性和构象，讨论了聚吡咯薄膜电化学机械变形的机理。
Electro-chemomechanical expansion and contraction in polypyrrole films synthesized electrochemically from pyrrole in electrolytes of p-phenolsulfonic (PPS) acid has been measured directly in various supporting electrolytes. It is found that the films maintain a high electro-chemomechanical activity and conductivity in the wide pH range from pH4 to pH10 and also at the reduced and oxidized states studied under the present conditions. The electro-chemomechanical expansion of polypyrrole films is primarily driven by the insertion of bulky ions, regardless of oxidation and reduction. This is different from the mechanism of polyaniline films, in which a conformation change of the polymer structure is involved. The mechanism of electro-chemomechanical deformation in polypyrrole film is discussed, taking the conductivity and conformation of polypyrrole into consideration.