Xu Ling, Jia Li-Chuan, Yan Ding-Xiang, Ren Peng-Gang, Xu Jia-Zhuang, Li Zhong-Ming
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University Chengdu 610065 China
School of Aeronautics and Astronautics, Sichuan University Chengdu 610065 China
RSC Adv. 2018 Feb 26;8(16):8849-8855. doi: 10.1039/c7ra13453c. eCollection 2018 Feb 23.
Carbon nanotube/high density polyethylene (CNT/HDPE) foam composites with high electrical conductivity and electromagnetic interference (EMI) shielding performance were developed by means of compression molding plus salt-leaching. The uniform porous structure and interconnected CNT networks throughout the cell backbones endowed the as-prepared foam composites with a significantly lower electrical percolation threshold (0.22 vol%) than that of the solid composites (0.84 vol%). Owing to the multiple reflections and scattering between the cell-matrix interfaces, the foam composites presented a superior specific EMI shielding effectiveness (EMI SE) of 104.3 dB cm g, 2.2 times higher than that of their solid counterpart. Besides this, the pore sizes of the CNT/HDPE foam composites could be easily tuned by controlling the particle size of the porogen. Also, the electrical conductivity and specific EMI SE increased with an increase in the cell diameter, which was attributed to the formation of a more perfect conductive network in the cell backbones. Our approach provides a novel idea for fabricating new lightweight EMI shielding materials, especially for aircraft and spacecraft applications.
通过压缩成型加盐沥法制备了具有高电导率和电磁干扰（EMI）屏蔽性能的碳纳米管/高密度聚乙烯（CNT/HDPE）泡沫复合材料。整个泡孔骨架中均匀的多孔结构和相互连接的碳纳米管网络使所制备的泡沫复合材料具有比固体复合材料（0.84体积%）低得多的电渗流阈值（0.22体积%）。由于泡孔-基体界面之间的多次反射和散射，泡沫复合材料呈现出104.3 dB cm g的优异比电磁干扰屏蔽效能（EMI SE），比其固体对应物高2.2倍。除此之外，通过控制致孔剂的粒径可以轻松调节CNT/HDPE泡沫复合材料的孔径。而且，电导率和比EMI SE随着泡孔直径的增加而增加，这归因于在泡孔骨架中形成了更完善的导电网络。我们的方法为制造新型轻质EMI屏蔽材料提供了新思路，特别是在飞机和航天器应用方面。
