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Low percolation threshold and electromagnetic shielding effectiveness of nano-structured carbon based ethylene methyl acrylate nanocomposites

机译：纳米碳基乙烯丙烯酸甲酯纳米复合材料的低渗透阈值和电磁屏蔽效能

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摘要

In the present work, we developed industrially scalable and affordable Ketjen carbon black (K-CB) ethylene methyl acrylate copolymer (EMA) composites with low percolation threshold and efficient electromagnetic interference (EMI) shielding efficiency associated with high potential of absorption dominance of electromagnetic (EM) radiations by conductive dissipation. The dispersion and distribution of K-CB inside the EMA elastomer have been affirmed with the help of qualitative electron micrograph techniques. The EMA matrix and K-CB filler interactions have been corroborated through bound rubber content and dynamic mechanical properties. Interfacial interactions between K-CB and polymer matrix are pivotal in determining the good reinforcing efficiency with tunable electrical conductivity as well as adjustable EMI shielding ability in K-CB filled composites. The proposed composites lead to a low percolation threshold (8.6 wt%) and promising high EMI shielding value of 33.9 dB for 20 wt% K-CB in the X-band frequency as compared to other expensive carbon fillers. On account of the thorough analysis of the composites, our high hopes have been placed on the promotion of low budget and flexible EMA/K-CB composite for the emerging field of superior EMI shielding applications. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在目前的工作中，我们开发了具有低渗透阈值和有效电磁干扰（EMI）屏蔽效率且具有较高的电磁吸收优势潜能的工业可扩展且价格合理的科琴炭黑（K-CB）乙烯丙烯酸甲酯共​​聚物（EMA）复合材料。 EM）通过传导耗散辐射。借助定性电子显微照片技术已确认了K-CB在EMA弹性体内的分散和分布。 EMA基体和K-CB填料的相互作用已通过结合的橡胶含量和动态力学性能得到了证实。 K-CB与聚合物基体之间的界面相互作用对于确定K-CB填充复合材料具有良好的增强效率，可调节的电导率以及可调节的EMI屏蔽能力至关重要。与其他昂贵的碳填料相比，拟议的复合材料具有较低的渗透阈值（8.6 wt％），并有望在X波段频率下对20 wt％的K-CB提供33.9 dB的高EMI屏蔽值。由于对复合材料进行了全面的分析，我们对低预算和灵活的EMA / K-CB复合材料在高级EMI屏蔽应用新兴领域的发展寄予了厚望。 （C）2017 Elsevier Ltd.保留所有权利。

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