Lightweight, multifunctional microcellular PMMA/Fe3O4@MWCNTs nanocomposite foams with efficient electromagnetic interference shielding
Lightweight, multifunctional microcellular PMMA/Fe3O4@MWCNTs nanocomposite foams with efficient electromagnetic interference shielding
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DOI：
10.1016/j.compositesa.2017.05.009
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发表时间：
2017-09-01
影响因子：
8.7
通讯作者：
Shi, Xuetao
中科院分区：
文献类型：
--
作者：
Zhang, Hongming;Zhang, Guangcheng;Shi, Xuetao
采用超临界二氧化碳（ScCO 2）发泡法制备了密度为0.22-0.38 g/cm 3的PMMA/Fe3O4@MWCNTs复合泡沫材料。得益于微孔结构和Fe3O4@MWCNTs杂化材料的存在，所得PMMA/Fe3O4@MWCNTs泡沫材料的电磁屏蔽效能（EMI SE）显著提高。具有7wt%的混合物负载的所得泡沫在X波段上显示出50 dB/（g/cm（3））的优异的比EMI SE。此外，还讨论了多孔材料的电磁屏蔽机理，认为多孔材料对电磁屏蔽的主要贡献是吸收。同时，高强度复合泡沫还表现出超顺磁行为和0.080-0.142 W/（m k）的低热导率。本研究为制备具有上级电磁屏蔽性能的轻质多功能PMMA/Fe3O4@MWCNT5泡沫材料提供了一种可行的方法。(C)2017由Elsevier Ltd.出版
Lightweight and multifunctional PMMA/Fe3O4@MWCNTs composite foams with density of 0.22-0.38 g/ cm3 were fabricated by supercritical carbon dioxide (ScCO2) foaming process. Benefitting from the existence of microcellular structure and the Fe3O4@MWCNTs hybrids, the specific Electromagnetic interference shielding effectiveness (EMI SE) of obtained PMMA/Fe3O4@MWCNTs foams was significantly enhanced. The resulting foams with hybrids loading of 7 wt% displayed excellent specific EMI SE of 50 dB/(g/cm(3)) over the X-band. Furthermore, the EMI shielding mechanisms of the porous materials were discussed and it suggested that the dominant contribution to EMI SE was absorption. Meanwhile, the high-strength composite foams also exhibited superparamagnetic behavior and low thermal conductivity of 0.080-0.142 W/(m k). In this work, we provide a feasible way to produce lightweight and multifunctional PMMA/Fe3O4@MWCNT5 foams with superior EMI shielding performance to apply in the electronics and aerospace industries. (C) 2017 Published by Elsevier Ltd.