文献类型：期刊文献

英文题名：Fabrication of a highly tough, strong, and stiff carbon nanotube/epoxy conductive composite with an ultralow percolation threshold: Via self-assembly

作者：Huang, Jinrui[1,2,3,4] Li, Nan[1,2,3,5] Xiao, Laihui[1,2] Liu, Haiqin[4] Wang, Yigang[1,2,3] Chen, Jie[1,2,3] Nie, Xiaoan[1,2,3] Zhu, Yutian[6]

第一作者：黄金瑞;Huang, Jinrui

通信作者：Huang, Jinrui

机构：[1] Key Laboratory of Biomass Energy and Material, Jiangsu Province, China; [2] Key Laboratory of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Chinese Academy of Forestry, Nanjing, Jiangsu Province, 210042, China; [3] National Engineering Laboratory for Biomass Chemical Utilization, Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing, Jiangsu Province, 210042, China; [4] Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, Jiangsu Province, 210042, China; [5] Institute of Advanced Synthesis and School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, Jiangsu Province, 211816, China; [6] College of Materials, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, Zhejiang, 311121, China

年份：2019

卷号：7

期号：26

起止页码：15731-15740

外文期刊名：Journal of Materials Chemistry A

收录：EI(收录号：20192807165983);Scopus(收录号：2-s2.0-85068507804)

语种：英文

外文关键词：Cellular automata - Epoxy resins - Fabrication - Nanotubes - Percolation (computer storage) - Percolation (fluids) - Self assembly - Solvents - Structural properties - Tensile strength - Toughness

摘要：Conductive epoxy composites are of great interest in industrial applications. The electrical properties of these composites, however, often come at the expense of mechanical properties, particularly toughness. Herein, we report a simple, facile, and universal fabrication method for a strong, stiff, and extremely tough conductive epoxy composite with an ultralow percolation threshold. By tuning the interaction between multi-walled carbon nanotubes (MWCNTs) and epoxy components, they spontaneously assembled into a "cellular structure", with the MWCNTs selectively located in the continuous domain of the diglycidyl ether of bisphenol A (DGEBA) epoxy. These cellular structures dramatically improved the toughness of the epoxy resin and the electrical properties of the MWCNT/epoxy composites while maintaining an excellent tensile strength and modulus. A 26.83-fold increase in toughness (to 3.25 ± 0.12 GJ m-3) was seen in the MWCNT/DGEBA/tung oil-based diglycidyl ester (TODGE) epoxy composite (0.75 wt% MWCNTs). The elongation at break of the composite increased 33.93 times (to 112.84 ± 4.25%) over that of neat DGEBA epoxy (toughness: 116.76 ± 7.84 MJ m-3; elongation at break: 3.23 ± 0.25%). The tensile strength and modulus remained at 37.09 ± 1.28 MPa and 2.88 ± 0.14 GPa, respectively. Moreover, composites with the cellular structure exhibited an ultralow electrical percolation threshold (～0.032 wt%). The outstanding toughness and good electrical properties of the MWCNT/epoxy composites with cellular structures are attributed to the synergistic toughening effects of TODGE and MWCNTs as well as volume exclusion from the cellular structure. This work provides a new strategy for designing mechanically robust multifunctional thermoset composites, which have important applications in various fields. ? 2019 The Royal Society of Chemistry.