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首页> 外文期刊>Journal of Materials Science >Evaluation and visualization of the percolating networks in multi-wall carbon nanotube/epoxy composites
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Evaluation and visualization of the percolating networks in multi-wall carbon nanotube/epoxy composites

机译：多壁碳纳米管/环氧树脂复合材料渗流网络的评估和可视化

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摘要

In this study, epoxy-based nanocomposites containing multi-wall carbon nanotubes (CNTs) were produced by a calendering approach. The electrical conductivities of these composites were investigated as a function of CNT content. The conductivity was found to obey a percolation-like power law with a percolation threshold below 0.05 vol.%. The electrical conductivity of the neat epoxy resin could be enhanced by nine orders of magnitude, with the addition of only 0.6 vol.% CNTs, suggesting the formation of a well-conducting network by the CNTs throughout the insulating polymer matrix. To characterize the dispersion and the morphology of CNTs in epoxy matrix, different microscopic techniques were applied to characterize the dispersion and the morphology of CNTs in epoxy matrix, such as atomic force microscopy, transmission electron microscopy, and scanning electron microscopy (SEM). In particular, the charge contrast imaging in SEM allows a visualization of the overall distribution of CNTs at a micro-scale, as well as the identification of CNT bundles at a nano-scale. On the basis of microscopic investigation, the electrical conduction mechanism of CNT/epoxy composites is discussed.
机译：在这项研究中，通过压延方法生产了包含多壁碳纳米管（CNTs）的环氧基纳米复合材料。研究了这些复合材料的电导率与CNT含量的关系。发现电导率遵循类似渗透的幂律，其渗透阈值低于0.05vol。％。纯的环氧树脂的电导率可以提高九个数量级，仅添加0.6％（体积）的CNT，这表明在整个绝缘聚合物基质中，CNT形成了良好的导电网络。为了表征CNT在环氧树脂基体中的分散度和形貌，采用了不同的显微镜技术表征CNT在环氧树脂基体中的分散度和形貌，例如原子力显微镜，透射电子显微镜和扫描电子显微镜（SEM）。特别地，在SEM中的电荷对比成像允许在微观尺度上可视化CNT的总体分布，并且在纳米尺度上识别CNT束。在微观研究的基础上，探讨了碳纳米管/环氧树脂复合材料的导电机理。

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