Effect of temperature on humido-sensitive conducting polymer actuators
Effect of temperature on humido-sensitive conducting polymer actuators
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DOI：
10.1016/j.sna.2009.10.022
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发表时间：
2010
影响因子：
4.6
通讯作者：
H. Okuzaki;K. Hosaka;Hiroki Suzuki;Takamichi Ito
中科院分区：
文献类型：
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作者：
H. Okuzaki;K. Hosaka;Hiroki Suzuki;Takamichi Ito
通过吸附等温线和电机械分析，研究了聚（3，4-乙撑二氧噻吩）掺杂聚（4-苯乙烯磺酸）（PEDOT/PSS）自支撑膜的水蒸气吸附和电活性聚合物驱动行为的温度依赖性.具有0.13m2 g-1的比表面积的无孔PEDOT/PSS膜在0.95的相对水蒸气压下吸附1080cm3（STP）g-1的水蒸气，对应于87重量%。温度从25 ° C升高到40 ° C降低了吸附程度，表明了放热过程，其中等量吸附热随着水蒸气吸附的增加而降低，并且该值达到43.9kJmol − 1，与水冷凝热（44kJmol − 1）一致。在施加10V时，膜在5 ° C下经历由焦耳加热引起的水蒸气解吸引起的2.46%的收缩，其在45 ° C下略微降低至2.10%。收缩的速度比膨胀的速度快一个数量级，并且对温度的依赖性较小，因为吸附在膜中的水蒸气通过焦耳加热被迫解吸。相反，温度越高，膜膨胀越快，因为扩散系数随着温度变高而增加。
Temperature dependence of water vapor sorption and electro-active polymer actuating behavior of free-standing films made of poly(3,4-ethylenedioxythiophene) doped with poly(4-styrenesulfonate) (PEDOT/PSS) was investigated by means of sorption isotherm and electromechanical analyses. The non-porous PEDOT/PSS film, having a specific surface area of 0.13m2g−1, sorbed water vapor of 1080cm3(STP)g−1, corresponding to 87wt%, at relative water vapor pressure of 0.95. A temperature rise from 25°C to 40°C lowered sorption degree, indicative of an exothermic process, where isosteric heat of sorption decreased with increasing water vapor sorption and the value reached 43.9kJmol−1, being consistent with the heat of water condensation (44kJmol−1). Upon application of 10V, the film underwent contraction of 2.46% at 5°C caused by desorption of water vapor due to Joule heating, which slightly decreased to 2.10% at 45°C. The speed of contraction was one order of magnitude faster than that of expansion and less dependent on the temperature since water vapor sorbed in the film were forced to desorb by Joule heating. In contrast, the higher the temperature the faster the film expansion because diffusion coefficient increased as the temperature became higher.