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FABRICATION OF CHEMOMECHANICAL ACTUATORS USING CONDUCTING POLYMERS.

使用导电聚合物制造化学机械执行器。

基本信息

批准号：
07455143
负责人：
KANETO Keiichi
金额：
$ 4.86万
依托单位：
KYUSHU INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

Purposes of the study are to clarify mechanisms of chemomechanical deformation, i.e.expansion and contraction of conducting polymers upon electrochemical oxidation/reduction, and to fabricate actuators using conducting polymers.In 1997, the degree, response and force of chemomechanical deformation in conducting polymer, polyaniline were investigated in various anions of aqueous solution. As results, mechanisms of deformation are found to be (1) doping and undoping of bulky anions, (2) conformational deformation of polymer resulted from delocalization of and (3) electrostatic repulsion between polycations. In these mechanisms, (1) is found to be predominant, however, (2) or (3) is suggested to play a role for the deformation.In 1998, self-doped polyaniline and polyaniline with giant anions are studied to elucidate the existence of mechanisms (2) and (3). Sulfonic polyaniline which is self-doped was synthesized and measured in the cyclic voltammogram and chemomechanical deformation. In the oxidation process, once the film expands followed by contraction at the quasi-equilibrium state. The expansion is explained by taking the delocalization of pi electrons or electrostatic repulsion between polycations. Then, structural relaxation takes place by the strong negative sulfonic ion, which attracts pi electrons of benzene ring, resulting in shrinking of polymer film.Polyaniline film polymerized by constant current mode with a giant anion of camphor sulfonic acid (CSA) was found to keep CSA anion in film during the redox reactions. the result indicates that during oxidation process the film slightly expand due to mechanism (2) and (3), even protons are excluded from the film.

1997年，我们研究了导电聚合物聚苯胺在不同阴离子水溶液中的化学机械变形程度、响应和变形力，研究了导电聚合物聚苯胺在不同阴离子水溶液中的化学机械变形机理，即导电聚合物在电化学氧化/还原过程中的膨胀和收缩，并利用导电聚合物制备了致动器。结果表明，形变机理为：（1）大体积阴离子的掺杂和去掺杂，（2）聚阳离子离域导致的聚合物构象形变，（3）聚阳离子间的静电排斥。1998年，通过对自掺杂聚苯胺和大阴离子掺杂聚苯胺的研究，阐明了（2）和（3）两种机制的存在。合成了自掺杂的磺化聚苯胺，并对其进行了循环伏安和化学机械形变测试。在氧化过程中，膜一旦膨胀，随后在准平衡状态下收缩。膨胀解释采取离域的π电子或聚阳离子之间的静电排斥。然后，强的阴离子磺酸离子吸引苯环上的π电子，使聚合物膜发生结构弛豫，导致聚合物膜的收缩，发现在氧化还原反应过程中，以樟脑磺酸（CSA）为巨阴离子的恒电流聚合聚苯胺膜可以保持CSA阴离子在膜中。结果表明，在氧化过程中，由于机制（2）和（3），膜轻微膨胀，甚至质子被排除在膜之外。