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Facile preparation of lightweight PE/PVDF/Fe3O4/CNTs nanocomposite foams with high conductivity for efficient electromagnetic interference shielding
Composites Part A: Applied Science and Manufacturing ( IF 8.7 ) Pub Date : 2020-08-28 , DOI: 10.1016/j.compositesa.2020.106095
Yishen Zhao , Junji Hou , Zhongyi Bai , Yang Yang , Xiaoqin Guo , Haoran Cheng , Zongshen Zhao , Xiaoli Zhang , Jingbo Chen , Changyu Shen

Light-weight Polyethylene/Poly(vinylidene fluoride)/Fe3O4/Carbon nanotubes (PE/PVDF/Fe3O4/CNTs) nanocomposite foams with efficient electromagnetic interference (EMI) shielding performance were prepared using green processing methods of melt blending and supercritical CO2 foaming. The microwave- absorbing ability of the PE/PVDF/Fe3O4/CNTs nanocomposite foams were significantly improved. Moreover, due to the selective dispersion of Fe3O4 and CNTs in the PVDF and PE matrix, respectively, CNTs directionally arranged in the cell wall during the foaming, leading to a high electric conductivity to improve the electromagnetic interference shielding effectiveness (EMI SE) through dielectric loss and polarization loss. The produced PE/PVDF/Fe3O4-10CNTs foam with a density of 0.9 g/cm3 and a thickness of 2.6 mm, exhibited a higher electrical conductivity of 0.25 S/cm. The outstanding total EMI SE of 26 dB (the corresponding specific EMI SE was 110 dB cm2/g), measured across the Ku-band frequency region, was obtained. This forming strategy has potential industrial application and large-scale EMI shielding materials producing guidance.



中文翻译:

方便地制备具有高电导率的轻质PE / PVDF / Fe 3 O 4 / CNTs纳米复合泡沫,可有效屏蔽电磁干扰

使用熔融共混的绿色加工方法,制备了具有高效电磁干扰(EMI)屏蔽性能的轻质聚乙烯/聚偏二氟乙烯/ Fe 3 O 4 /碳纳米管(PE / PVDF / Fe 3 O 4 / CNTs)纳米复合泡沫。和超临界CO 2发泡。PE / PVDF / Fe 3 O 4 / CNTs纳米复合泡沫材料的吸波能力得到显着提高。而且,由于Fe 3 O 4的选择性分散分别将PVDF和PE基质中的CNT和CNT在发泡过程中定向排列在孔壁中,从而产生高电导率,从而通过介电损耗和极化损耗提高电磁干扰屏蔽效果(EMI SE)。所产生的PE / PVDF / Fe 3 O 4 -10CNTs泡沫具有0.9g / cm 3的密度和2.6mm的厚度,显示出更高的0.25S / cm的电导率。在Ku频段的整个频率范围内测得的出色的总EMI SE为26 dB(相应的特定EMI SE为110 dB cm 2 / g)。该成形策略具有潜在的工业应用和大规模EMI屏蔽材料的生产指导。

更新日期:2020-08-29
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