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

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]Harbin Engn Univ, Coll Aerosp & Civil Engn, Harbin 150001, Peoples R China;[2]Natl Univ Singapore, Dept Mech Engn, Singapore 117576, Singapore;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2020

卷号：81

外文期刊名：POLYMER TESTING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000525303900055)】；

基金：The authors gratefully thank the Strength of Materials & Impact Mechanics Lab., Department of Mechanical Engineering, National University of Singapore (NUS) and China Scholarship Council (CSC) program. Particularly, Dr. Fangxin Wang appreciates the helpful discussion and technical assistance from Prof. Tong Earn Tay and Lab. Assistant Low Chee Wah, Joe. Finally, this work was sponsored by the National Natural Science Foundation of China (Nos. 11972124, 11532013).

语种：英文

外文关键词：Conductive nanocomposite; Surfactant treatment; Fracture behavior; DIC analysis

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 criticalstress-intensity factor (K-Ic) and dynamic crack initiation toughness (K-Ii(d)) 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 similar to 79% and similar to 153% in K-Ic and K-Ii(d) 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 mu s) 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.