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.

中文翻译：

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超临界二氧化碳发泡制备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） 屏蔽性能的高分子纳米复合泡沫已成为减少电磁波污染的研究热点。在此，我们通过遵循简单的熔融混合和批量发泡程序制备了聚乙烯/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 的基体比实现了 PVDF/PE 的共连续结构体系，同时在 PVDF/PE 比为 5：5 的纳米复合材料中达到了约 28 dB 的最大平均 EMI 屏蔽效率。此外，PVDF/PE 比为 9：1 的纳米复合泡沫获得了高达 275 dB‧cm2‧g−1 的最大比 EMI SE，其中 EMI 屏蔽机制主要基于吸收，导致二次电磁波污染显着减少。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一种减少二次电磁波污染的新策略，在军事和民用领域都具有巨大的应用潜力。