Fabrication of electromagnetic wave absorption nanocomposite foam with adjustable conductive network by supercritical carbon dioxide foaming

IF 3.4 3区 工程技术 Q2 CHEMISTRY, PHYSICAL
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引用次数: 0

Abstract

Polymer nanocomposite foams with high electromagnetic interference (EMI) shielding performance have become the research hotspot to reduce electromagnetic wave pollution. Herein, we prepared polyethylene/poly (vinylidene fluoride)/carbon nanotubes/Fe3O4(PE/PVDF/Fe3O4/CNTs) nanocomposites and nanocomposite foams by following the simple melt blending and batch foaming procedures. The co-continuous structure system of PVDF/PE was achieved by altering the matrix ratio of PVDF/PE, while reaching a maximum average EMI shielding efficiency of ca. 28 dB for the nanocomposite with PVDF/PE ratio of 5:5. Furthermore, the largest specific EMI SE of as high as 275 dB‧cm2‧g−1 was obtained for the nanocomposite foam with PVDF/PE ratio of 9: 1, in which the EMI shielding mechanism is mainly based on absorption, leading to a significantly reduction in the secondary EM wave pollution. Therefore, the preparation of porous polymer nanocomposite foams with excellent EM wave absorption performance served as a novel strategy to reduce secondary EM wave pollution that holds great potential for applications in both military and civilian fields.

利用超临界二氧化碳发泡技术制造具有可调导电网络的电磁波吸收纳米复合泡沫
具有高电磁干扰(EMI)屏蔽性能的聚合物纳米复合泡沫已成为减少电磁波污染的研究热点。本文采用简单的熔融共混和批量发泡工艺制备了聚乙烯/聚偏二氟乙烯/碳纳米管/Fe3O4(PE/PVDF/Fe3O4/CNTs)纳米复合材料和纳米复合泡沫。通过改变 PVDF/PE 的基体比例,实现了 PVDF/PE 的共连续结构体系,而 PVDF/PE 比例为 5:5 的纳米复合材料的最大平均 EMI 屏蔽效率约为 28 dB。此外,PVDF/PE 比为 9:1 的纳米复合泡沫的最大特定 EMI SE 高达 275 dB‧cm2‧g-1,其中 EMI 屏蔽机制主要基于吸收,从而显著减少了二次电磁波污染。因此,制备具有优异电磁波吸收性能的多孔聚合物纳米复合泡沫是减少二次电磁波污染的一种新策略,在军事和民用领域都有很大的应用潜力。
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来源期刊
Journal of Supercritical Fluids
Journal of Supercritical Fluids 工程技术-工程:化工
CiteScore
7.60
自引率
10.30%
发文量
236
审稿时长
56 days
期刊介绍: The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.
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