Charge Dynamics and Bending Actuation in Aquivion Membrane Swelled with Ionic Liquids.
Charge Dynamics and Bending Actuation in Aquivion Membrane Swelled with Ionic Liquids.
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DOI：
10.1016/j.polymer.2010.11.030
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发表时间：
2011-01-21
期刊：
影响因子：
4.6
通讯作者：
Zhang, Q. M.
中科院分区：
文献类型：
--
作者：
Lin, Junhong;Liu, Yang;Zhang, Q. M.
离子电活性聚合物（EAP）致动器的致动应变和速度主要由致动器中的电荷输运和电极附近的过量离子储存决定。我们采用最近发展的离子传输和储存理论来研究不同离子液体（IL） 1-乙基-3-甲基咪唑三氟甲烷磺酸盐（EMI-Tf）的短侧链Aquivion®（Hyflon®）膜的电荷动力学。结果表明，在离子液体的临界吸收下，膜具有较高的离子电导率（σ>5×10−2 mS/cm）。特别是，我们研究了在实际器件工作电压范围内（~1伏或更高）的电荷动态。结果表明，当外加电压低于1伏（σ低于4伏）时，离子电导率、离子迁移率和离子浓度没有变化。结果还表明，当EMI-Tf为40%时，aquvion膜的弯曲致动作用远大于Nafion膜，说明较短的柔性侧链改善了过量离子与膜骨干之间的机电耦合，但不影响致动速度。
The actuation strain and speed of ionic electroactive polymer (EAP) actuators are mainly determined by the charge transport through the actuators and excess ion storage near the electrodes. We employ a recently developed theory on ion transport and storage to investigate the charge dynamics of short-side-chain Aquivion® (Hyflon®) membranes with different uptakes of ionic liquid (IL) 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (EMI-Tf). The results reveal the existence of a critical uptake of ionic liquids above which the membrane exhibit a high ionic conductivity (σ>5×10−2 mS/cm). Especially, we investigate the charge dynamics under voltages which are in the range for practical device operation (~1 volts and higher). The results show that the ionic conductivity, ionic mobility, and mobile ion concentration do not change with the applied voltage below 1 volt (and for σ below 4 volts). The results also show that bending actuation of the Aquivion membrane with 40 wt% EMI-Tf is much larger than that of Nafion, indicating that the shorter flexible side chains improve the electromechanical coupling between the excess ions and the membrane backbones, while not affect the actuation speed.
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