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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Electrically conductive and electromagnetic interference shielding of polyethylene composites with devisable carbon nanotube networks
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Electrically conductive and electromagnetic interference shielding of polyethylene composites with devisable carbon nanotube networks

机译：具有适当碳纳米管网络的聚乙烯复合材料的导电和电磁干扰屏蔽

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摘要

This paper reports a comparative study of the electrical and electromagnetic interference (EMI) shielding performance of three carbon nanotube/polyethylene (CNT/PE) composites with different conductive networks, i.e., segregated structure (s-CNT/PE), partially segregated structure (p-CNT/PE) and randomly distributed structure (r-CNT/PE). The s-CNT/PE composite exhibits superior electrical conductivity up to 2 orders of magnitude over that of p-CNT/PE and r-CNT/PE composites, at the same CNT loading. Only 5 wt% CNT addition in the s-CNT/PE composite realizes an excellent EMI shielding effectiveness (SE) as high as 46.4 dB, which is 20% and 46% higher than that for p-CNT/PE and r-CNT/PE composites, respectively. The selectively distributed CNTs at the interfaces between PE polyhedrons would certainly increase the effective CNT concentrations that form conducting pathways and thus increase the electrical conductivity and EMI SE in the s-CNT/PE composites. Such special structure also provides numerous interfaces that absorb the electromagnetic waves, resulting in an absorption-dominated shielding mechanism. Our work suggests that designing conductive networks in polymer composites is a promising approach to develop high-performance EMI shielding materials.
机译：本文报告了三种具有不同导电网络的碳纳米管/聚乙烯（CNT / PE）复合材料的电磁屏蔽（EMI）屏蔽性能的比较研究，这些导电网络分别是隔离结构（s-CNT / PE），部分隔离结构（ p-CNT / PE）和随机分布的结构（r-CNT / PE）。在相同的CNT负载下，s-CNT / PE复合材料的导电性比p-CNT / PE和r-CNT / PE复合材料高2个数量级。 s-CNT / PE复合材料中仅添加5 wt％的CNT即可实现高达46.4 dB的出色EMI屏蔽效果（SE），分别比p-CNT / PE和r-CNT /高出20％和46％。 PE复合材料。在PE多面体之间的界面处选择性分布的CNT无疑会增加形成导电路径的有效CNT浓度，从而增加s-CNT / PE复合材料的电导率和EMI SE。这种特殊的结构还提供了许多吸收电磁波的界面，从而形成了以吸收为主的屏蔽机制。我们的工作表明，在聚合物复合材料中设计导电网络是开发高性能EMI屏蔽材料的有前途的方法。

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