Abstract Graphene nanoplatelets (GnP) and α-MnO2 decorated GnP were integrated into an ethylene vinyl acetate (EVA) matrix using the dual mixing method (solution followed by melt mixing). GnP was added in 1, 3, 5, 8, 10 and 15 phr loadings into an EVA matrix to obtain composites and evaluate their various properties suitable for mechanical and electrical applications. The graphene nanoplatelets were further decorated with α-MnO2 which was subsequently integrated into EVA at an 8 phr loading to form composites. It was observed in the GnP-EVA composites, that with an increasing GnP content, a substantial increase in the tensile strength (188%) over the neat polymer was observed at a 10 phr loading but reduced thereafter at a 15 phr loading. Dielectric permittivity of the composites were observed to increase with an increasing filler loading, the addition of α-MnO2 also having a beneficial effect. Conductivity as well as the electromagnetic interference shielding performance were improved with increasing GnP concentrations. A maximum 28 dB of shielding was observed in the 15 phr loaded GnP-EVA composite whereas the α-MnO2 decorated GnP-EVA composite showed a shielding efficiency of 22 dB at a concentration of 8 phr for a thickness of 2 mm with excellent thermal and mechanical properties. Overall, the composite material will find its application as a flexible EMI shielding material.

中文翻译：

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用于电磁屏蔽应用的石墨烯和二氧化锰装饰的石墨烯填充复合材料具有优异的介电性能

摘要 石墨烯纳米片 (GnP) 和 α-MnO2 装饰的 GnP 使用双重混合方法（溶液后熔融混合）整合到乙烯醋酸乙烯酯 (EVA) 基质中。GnP 以 1、3、5、8、10 和 15 phr 的负载量添加到 EVA 基体中，以获得复合材料并评估它们适用于机械和电气应用的各种性能。石墨烯纳米片进一步用 α-MnO2 装饰，随后以 8 份的负载量整合到 EVA 中以形成复合材料。在 GnP-EVA 复合材料中观察到，随着 GnP 含量的增加，在 10 phr 负载下观察到拉伸强度比纯聚合物显着增加（188%），但在 15 phr 负载下降低。观察到复合材料的介电常数随着填料含量的增加而增加，α-MnO2 的加入也有有益的效果。随着 GnP 浓度的增加，电导率和电磁干扰屏蔽性能得到改善。在 15 phr 负载的 GnP-EVA 复合材料中观察到最大 28 dB 的屏蔽，而 α-MnO2 装饰的 GnP-EVA 复合材料在 8 phr 的浓度下表现出 22 dB 的屏蔽效率，厚度为 2 mm，具有出色的热和机械性能。总体而言，复合材料将用作柔性 EMI 屏蔽材料。在 15 phr 负载的 GnP-EVA 复合材料中观察到最大 28 dB 的屏蔽，而 α-MnO2 装饰的 GnP-EVA 复合材料在 8 phr 的浓度下表现出 22 dB 的屏蔽效率，厚度为 2 mm，具有出色的热和机械性能。总体而言，复合材料将用作柔性 EMI 屏蔽材料。在 15 phr 负载的 GnP-EVA 复合材料中观察到最大 28 dB 的屏蔽，而 α-MnO2 装饰的 GnP-EVA 复合材料在 8 phr 的浓度下表现出 22 dB 的屏蔽效率，厚度为 2 mm，具有出色的热和机械性能。总体而言，复合材料将用作柔性 EMI 屏蔽材料。