Almomani Abdallah, Hong Wangyujue, Hong Wei, Montazami Reza
Department of Aerospace Engineering, Iowa State University, Ames, IA 50011, USA.
Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA.
Polymers (Basel). 2017 Aug 12;9(8):358. doi: 10.3390/polym9080358.
Ionic polymer-metal composite (IPMC) actuators have considerable potential for a wide range of applications. Although IPMC actuators are widely studied for their electromechanical properties, most studies have been conducted at the ambient conditions. The electromechanical performance of IPMC actuators at higher temperature is still far from understood. In this study, the effect of temperature on the electromechanical behavior (the rate of deformation and curvature) and electrochemical behavior (current flow) of ionic liquid doped IPMC actuators are examined and reported. Both electromechanical and electrochemical studies were conducted in air at temperatures ranging from 25 °C to 90 °C. Electromechanically, the actuators showed lower cationic curvature with increasing temperature up to 70 °C and a slower rate of deformation with increasing temperature up to 50 °C. A faster rate of deformation was recorded at temperatures higher than 50 °C, with a maximum rate at 60 °C. The anionic response showed a lower rate of deformation and a higher anionic curvature with increasing temperatures up to 50 °C with an abrupt increase in the rate of deformation and decrease of curvature at 60 °C. In both cationic and anionic responses, actuators started to lose functionality and show unpredictable performance for temperatures greater than 60 °C, with considerable fluctuations at 70 °C. Electrochemically, the current flow across the actuators was increased gradually with increasing temperature up to 80 °C during the charging and discharging cycles. A sudden increase in current flow was recorded at 90 °C indicating a shorted circuit and actuator failure.
离子聚合物-金属复合材料（IPMC）致动器在广泛的应用中具有相当大的潜力。尽管IPMC致动器因其机电性能而被广泛研究，但大多数研究都是在环境条件下进行的。IPMC致动器在较高温度下的机电性能仍远未被了解。在本研究中，研究并报告了温度对离子液体掺杂的IPMC致动器的机电行为（变形速率和曲率）以及电化学行为（电流流动）的影响。机电和电化学研究均在空气中于25℃至90℃的温度范围内进行。在机电方面，致动器在温度升高至70℃时阳离子曲率降低，在温度升高至50℃时变形速率减慢。在高于50℃的温度下记录到更快的变形速率，在60℃时达到最大值。阴离子响应在温度升高至50℃时显示出较低的变形速率和较高的阴离子曲率，在60℃时变形速率突然增加且曲率降低。在阳离子和阴离子响应中，对于温度高于60℃的情况，致动器开始失去功能并表现出不可预测的性能，在70℃时波动较大。在电化学方面，在充电和放电循环期间，跨致动器的电流随着温度升高至80℃而逐渐增加。在90℃时记录到电流突然增加，表明出现短路和致动器故障。
