Enhanced Thermally Conductive and Microwave Absorbing Properties of Polymethyl Methacrylate/Ni@GNP Nanocomposites

作者：Yang Pan, Bin Yang, Ning Jia, Yangnan Yu, Xiang Xu, Yingying Wang, Ru Xia, Jiasheng Qian, Chenjun Wang, Aiqing Sun, You Shi, Yirong Fang · 发表于：Industrial & Engineering Chemistry Research · 年份：2021 · DOI：10.1021/acs.iecr.1c01885 · 被引用次数：24 · 研究领域：Electromagnetic wave absorption materials、Dielectric materials and actuators、Flame retardant materials and properties

In this work, [email protected] nanohybrids fabricated via an in situ reduction method were incorporated into polymethyl methacrylate (PMMA) to prepare PMMA/ [email protected] nanocomposites via solution blending and hot-pressing. The Ni nanoparticles with an average diameter of 70–80 nm were observed to successfully grow on the GNP surface via SEM and TEM. Both thermally conductive and microwave absorbing properties of the prepared composites were intensively investigated. A reflection loss test experimentally suggested that the PMMA/ [email protected] composites showed a good microwave absorbing property, among which the composite containing 30 wt % [email protected] displayed the best microwave absorption performance (with a value of −30 dB for RL min in the C band). The thermal conduction behavior of the composites was jointly studied by infrared thermal imaging (ITI) and enthalpy transformation method together with a four-parameter model. The average heating rate during an initial stage was obviously found to increase from 65.4 to 103.2 °C/min, indicating that a well-defined heat conduction network gradually formed in the composites, which exerted positive influence on heat conduction. The composites generally bore perfect thermal conductivities (e.g., with a maximum in-plane thermal conductivity of 9.02 W/m·K and a maximum out-of-plane value of 1.29 W/m·K), and the variations of thermal conductivity versus filler loading should be attributed to the construction of an an...