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Innovations in polymer nanocomposite coatings for EMI Shielding applications

机译：EMI屏蔽应用的聚合物纳米复合涂层的创新

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Start Excessive usage of electronic gadgets, telecommunication devices and electrical appliances has led to unwanted electromagnetic interference (EMI) as side effect. The EMI pollution interferes with the performance and functioning of the electrical equipments, which is generated through the conduction or radiation of emitted electromagnetic (EM) waves. In addition to affecting the quality of electrical appliances, EMI has a huge negative impact on the health and life of living organisms. Moreover, microwave frequency operated functions such as radar surveillance systems; weather radar, military aviation, radar guns, wireless technology and satellite communication are more prone to EMI pollution and specifically with regard to stealth purposes. In this paper carbon nanomaterial based polyurethane nanocomposites have been synthesized and investigated for decreasing the EM wave pollution due to their light weight, flexibility, optimum conductivity and good dielectric properties. Three different types of graphene sheets such as thermally reduced and exfoliated graphene (TRG); chemically reduced graphene (CRG) and Polyvinyl-pyyrolidone stabilized silver nanoparticles based graphene nanohybrid (Ag-PVP-CRG) have been synthesized and characterized for EMI shielding properties. Further, TRG, CRG and Ag-PVP-CRG sheets have been dispersed in thermoplastic polyurethane (TPU) polymeric matrix to create multifunctional nanocomposite films with properties such as EMI shielding, electrically conductivity and dielectric behavior. The study presents for the first time a comparative evaluation of three different types of graphene sheets in both neat and nanocomposite form. The synthesis of Ag-PVP-CRG nanohybrids and its application for EMI shielding is novel and reported for the first time for such an application.
机译：小工具，电信设备和电器的开始过度使用导致了不想要的电磁干扰（EMI）为副作用。所述EMI污染干扰了电气设备，这是通过导通或发射的电磁（EM）波的辐射所产生的性能和功能。除了影响电器的质量，EMI对生物体的健康和寿命产生很大的负面影响。此外，微波频率工作的功能，例如雷达监视系统;气象雷达，军用航空，雷达测速，无线技术和卫星通信更容易EMI污染，特别是关于隐形的目的。在本文中的碳纳米材料的纳米复合材料的聚氨酯已经合成和研究用于减少EM波污染，由于其重量轻，柔性，最佳导电性和良好的介电性能。三种不同类型的石墨烯片的诸如热还原和剥离石墨烯（TRG）;化学还原的石墨烯（CRG）和聚乙烯pyyrolidone稳定的银纳米颗粒的石墨烯纳米杂化物（AG-PVP-CRG）已被合成和表征用于EMI屏蔽性能。此外，TRG，CRG和Ag-PVP-CRG片已被分散在热塑性聚氨酯（TPU）聚合物基质，以创建具有诸如EMI屏蔽，导电率和介电行为的属性的多功能纳米复合材料膜。该研究提出了第一次三种不同类型的石墨烯片的两个整齐的纳米复合材料形式的对比评测。的Ag-PVP-CRG纳米复合物的合成及其用于EMI屏蔽应用是新颖的和报道首次用于这样的应用。

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