文献类型：期刊文献

英文题名：Simultaneous Enhancements of Electrical Conductivity and Electromagnetic Interference Shielding Performance by Regulating Porous Structure of Dual-Percolation Pb/Poe/Cnts Composites

作者：Hu, Dongdong[1]; Zhang, Yanyan[1]; Lai, Xiongfeng[2]; Li, Weijie[1]; Yuan, Wenbo[2]; Wang, Qi[3]; Xu, Menglong[1]; Zhao, Ling[4]

机构：[1] State Key Laboratory of Chemical Engineering, Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Shandong Chambroad Polyolefin Performance Materials Co., Ltd., Binzhou, 256500, China; [3] Beijing University of Chemical Technology, China; [4] Xinjiang University, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240121391)

语种：英文

外文关键词：Blending - Carbon nanotubes - Electric conductivity - Electromagnetic pulse - Electromagnetic shielding - Electromagnetic wave interference - Ethylene - Foams - Porosity - Signal interference - Solvents - Supercritical fluid extraction - Void fraction

摘要：The dual-percolation polybutene-1 (PB)/poly(ethylene-co-octene) (POE)/carbon nanotubes (CNTs) composites foams with light weight, high conductivity, and high-efficiency EMI shielding performance were successfully prepared via melt blending followed by supercritical carbon dioxide (sc-CO2) foaming. The CNT’s preferential location in the PB phase of PB/POE/CNTs composites was verified based on the kinetic/thermodynamic predictions and SEM observations. The dual percolation structure and porous microstructure of composites affecting the electrical conductivity and EMI shielding property were carefully evaluated. Owning to the bimodal porous structure of dual-percolation composite foams, in which large pores contributed to increasing porosity and small pores dedicated to maintaining the connectivity in conductive networks, the high void fraction and high conductivity were simultaneously achieved. The electromagnetic interference (EMI) shielding performance showed that the foamed PB/POE/CNTs composites with 1.4 vol% CNTs loading displayed a 71% decrease in density, 43.2% increase in absorptivity, 41.1% increase in EMI shielding effectiveness (SE), and 76.4% increase in specific EMI SE, in comparation with the solid PB/POE/CNTs loaded with 1.6 vol% CNTs. Moreover, the foamed PB/POE/CNTs composites with a 3.3 vol% CNTs loading achieved a high EMI SE of 22.4 dB, satisfying the requirements of commercial EMI shielding materials (≥20 dB). ? 2024, The Authors. All rights reserved.