ABSTRACT

The composition and microstructure of graphene aerogels (GAs) play crucial roles in the electromagnetic shielding performance of their polymer composites. In this paper, the microwave-reduced graphene aerogel was prepared by the rapid microwave irradiation of GA. And then, the MRGA/Polyetherketone cardo (PEK-C) composites were fabricated via a vacuum-assisted impregnating method. The study showed that the microwave irradiation significantly enhances the quality of GAs, leading to a less defective structure and an increase in conductivity. Furthermore, the MRGAs are very effective in endowing composites with high electromagnetic interference (EMI) shielding efficiency. When the filler content is 4.06 wt-%, the MRGA/PEK-C composite exhibits an EMI SE of 36.4 dB in the X band (8.2–12.4 GHz). The study also indicated that the shielding mechanism of composites is dominated by absorption.

摘要

石墨烯气凝胶（GAs）的组成和微观结构在其聚合物复合材料的电磁屏蔽性能中起着至关重要的作用。本文通过微波快速辐照GA制备了微波还原石墨烯气凝胶。然后，通过真空辅助浸渍法制备了MRGA /聚醚酮（PEK-C）复合材料。研究表明，微波辐射显着提高了GA的质量，从而减少了缺陷结构并提高了电导率。此外，MRGA在赋予复合材料高电磁干扰（EMI）屏蔽效率方面非常有效。当填料含量为4.06 wt％时，MRGA / PEK-C复合材料在X波段（8.2–12.4 GHz）中的SE SE为36.4 dB。