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首页> 外文期刊>Journal of Applied Polymer Science >Nonmonotonic piezoresistive effect in elastomeric composite films
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Nonmonotonic piezoresistive effect in elastomeric composite films

机译：弹性复合膜的非单调压阻效应

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摘要

We compared the change of electrical resistance with elongation (piezoresistive effect) in thin films made of conductive multiwalled carbon nanotubes embedded in eight different elastomers. Two distinct forms of piezoresistive effect were observed: (i) in the monotonic (M) case, the film resistance always increased with the applied strain; (ii) the nonmonotonic (NM) case showed an initial increase in the resistance, while with further elongation the resistance began to decrease. By varying the amount of nitrile and/or styrene groups in the polymer matrix one can alter the piezoresistive effect qualitatively: composites with approximate to 25 wt % or more of nitrile or styrene functional side groups exhibited M piezoresistance, while others, with no, or methyl side groups only, showed NM piezoresistance. Influence of the second filler (either conductive carbon black or nonconductive nanoclay) in the ternary composites on the piezoresistive effect was explored. The possibility to modify the piezoresistive behavior of the conductive elastomer composites, for example, via chemical modification of the polymeric matrix, opens up a new venue for practical applications such as diverse types of sensors and, in NM case, complex dynamical systems (bistable elements, electromechanical oscillators, etc.) in the MEMS field. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43518.
机译：我们在嵌入八种不同弹性体的导电多壁碳纳米管制成的薄膜中比较了电阻的变化与伸长率（抗压效应）。观察到两种不同形式的压阻效应：（i）在单调（M）情况下，膜电阻始终随所施加的应变而增加; （ii）非单调（NM）情况显示出电阻的初始增加，而随着进一步伸长，电阻开始下降。通过改变聚合物基体中腈基和/或苯乙烯基团的数量，可以定性地改变压阻效应：腈基或苯乙烯官能侧基的含量接近25 wt％或更多的复合材料表现出M压阻性，而其他则没有或没有。仅甲基侧基显示NM压阻。探索了三元复合物中第二种填料（导电炭黑或非导电纳米粘土）对压阻效应的影响。例如通过对聚合物基体进行化学改性来改变导电弹性体复合材料的压阻性能的可能性，为实际应用开辟了新场所，例如各种类型的传感器，在NM情况下，复杂的动力学系统（双稳态元件） ，机电振荡器等）。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43518。

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