文献类型：期刊文献

英文题名：Epoxy/CNT@X nanocomposite: Improved quasi-static, dynamic fracture toughness, and conductive functionalities by non-ionic surfactant treatment: Fracture behavior of surfactant-treatment nanocomposite

作者：Wang, Fangxin[1,2]; Zhang, Kai[1,2]; Liang, Wenyan[1]; Wang, Zhenqing[1]; Tay, Tong Earn[2]; Lu, Shengzhuo[1,2]; Yang, Bin[3]

机构：[1] College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin, 150001, China; [2] Department of Mechanical Engineering, National University of Singapore, 117576, Singapore; [3] School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2020

卷号：81

外文期刊名：Polymer Testing

收录：EI(收录号：20195007812109)

语种：英文

外文关键词：Dynamic loads - Surface active agents - Surface chemistry - Fracture toughness - Carbon nanotubes - Image correlation - Crack initiation - Crack tips

摘要：The present work investigated the effects of non-ionic surfactant treatment on the dispersibility, surface chemistry and structure of carbon nanotube (CNT) particles. Subsequently, the fracture experiments of as-prepared epoxy/CNT@X nanocomposites were carried out under quasi-static and dynamic loading conditions. By simply introducing the steric repulsive force between CNT@X filler and epoxy matrix, improved mode-I critical-stress-intensity factor (KIc) and dynamic crack initiation toughness (KIid) of the epoxy/CNT@X nanocomposite were simultaneously obtained without compromising other desired physical properties, such as electrical properties and electro-thermal behavior. In the case of SHPB impact loading, high-speed imaging along with digital-image-correlation (DIC) technology was utilized to determine dynamic fracture parameters. The results showed a notable reinforcement for the epoxy/CNT@X nanocomposite category, producing maximum increase of ~79% and ~153% in KIc and KIid values relative to epoxy/CNT nanocomposite at such maximum content of 1.0 wt%, respectively. The most delayed crack initiation time (59.9–68.4 μs) and slowest crack-tip velocity (229 ± 28 m/s) were also observed in the epoxy/CNT@X_1.0 case. These results may be explained by improved dispersibility and interfacial adhesion after surfactant treatment. ? 2019