Broadband electromagnetic absorbing performance by constructing alternate gradient structure (AGS) for PMMA-based foams
Broadband electromagnetic absorbing performance by constructing alternate gradient structure (AGS) for PMMA-based foams
复制标题
DOI：
10.1016/j.compositesa.2021.106557
复制
发表时间：
2021-10
影响因子：
8.7
通讯作者：
D. Zhou;Huan Yuan;Zirui Yu;Weiyang Guo;Y. Xiong;G. Luo;Q. Shen
中科院分区：
文献类型：
--
作者：
D. Zhou;Huan Yuan;Zirui Yu;Weiyang Guo;Y. Xiong;G. Luo;Q. Shen
采用一步物理约束发泡技术，将PMMA基复合材料与碳纳米管片层交替排列，制备出具有交替梯度结构（AGS）的泡沫。研究了AGS结构对泡沫吸波性能的影响。理论计算和直接测试结果表明，与普通单层泡沫相比，在相同碳纳米管含量下，AGS泡沫的吸收带宽拓宽到3.2 GHz（8.8-12.0 GHz），最小反射损耗降低到−30.2 dB。这种增强作用归因于AGS，它改善了泡沫的阻抗匹配，同时引发电磁波的多次反射，加剧了层界面之间的界面极化损耗以及碳纳米管网络的导电损耗，赋予了AGS泡沫出色的耗散能力。这为设计和制备轻质、性能优良的EMA材料提供了一条有效途径。
The PMMA-based composites with CNTs sheets were alternate arranged to fabricate the foam with alternate gradient structure (AGS) via the one-step physical constraint foaming technology. The influence of AGS structure on electromagnetic waves absorbing (EMA) properties of foam were detailed study. The theoretically calculated and directly tested results present that comparing with the normal single-layer foam, the absorbing bandwidth of the foam with AGS broadens to 3.2 GHz (8.8–12.0 GHz) and the minimum reflection loss decreases to −30.2 dB at the same CNTs content. This enhancement is attributed to AGS, which improves the impedance matching of foams while triggers multiple reflection of electromagnetic waves and intensifies interfacial polarization loss among the layer interfaces, as well as conductive loss of CNTs network, endowing outstanding dissipation capability of the foam with AGS. It provides an effective way to design and fabricate light weight and good EMA materials.