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Shear Induced Electrical Behaviour of Conductive Polymer Composites

机译：剪切诱导导电聚合物复合材料的电动特性

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The time-dependent electrical resistance of polymethylmethacrylate containing carbon black was measured under oscillatory shear in the molten state. The electrical signal was oscillating exactly at the doubled frequency of the oscillatory shear deformation. Moreover, the experimental results gave a hint to the development of conductive structures in polymer melts under shear deformation. It was shown that the flow induced destruction of conductive paths dominates over the flow induced build-up in the beginning of the shear deformations. However, for longer times both competitive effects reach a dynamic equilibrium and only the thermally induced build-up of pathways influences the changes in the composite resistance during the shear. Furthermore, the oscillating electrical response depends clearly on the deformation amplitude applied. A simple physical model describing the behaviour of conductive pathways under shear deformation was derived and utilized for the description of the experimental data.
机译：在熔融状态下在振荡剪切下测量含有炭黑的聚甲基丙烯酸甲酯的时间依赖性电阻。电信号精确地振荡振荡剪切变形的双倍频率。此外，实验结果暗示了剪切变形下聚合物熔体中导电结构的开发。结果表明，在剪切变形开始时，流动诱导的导电路径的破坏主导地占流量诱导的积聚。然而，对于较长时间的竞争效应达到动态均衡，并且只有热诱导的途径积聚影响剪切期间的复合电阻的变化。此外，振荡电响应明显取决于所施加的变形幅度。导出描述剪切变形下导电途径行为的简单物理模型，并用于对实验数据的描述。

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