文献类型：期刊文献

英文题名：Construction of carbon nanotubes/bismaleimide composite films with superior tensile strength and toughness

作者：Zhan, Hang[1];Lin, Jia Hao[1];Shi, Hong Liang[1];Wang, Jian Nong[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2021

卷号：214

外文期刊名：COMPOSITES SCIENCE AND TECHNOLOGY

收录：;EI(收录号：20213110721852);WOS:【SCI-EXPANDED(收录号:WOS:000694728300001)】；

基金：This research was supported by National Key R&D Program of China [2018YFA0208404] , National Natural Science Foundation of China [U1362104] , and Innovation Program of Shanghai Municipal Education Commission.

语种：英文

外文关键词：Carbon nanotube; Bismaleimide; Composite film; Mechanical property

摘要：Carbon nanotubes (CNTs) have been considered as promising reinforcements for various composites due to their excellent mechanical properties. However, preparation of high-performance CNT/resin composites still suffers from bad dispersion, low fraction, and poor alignment of CNTs and their weak bonding with the resin matrix. Herein, we report an effective strategy towards preparing CNT/Bismaleimide (BMI) composite films with excellent mechanical properties. Firstly, from floating catalytic spray pyrolysis, CNTs are deposited on a water soluble substrate as a thin film to maintain their original microstructures. The films are then stacked layer by layer and pulled in tension with the substrate dissolved in water. The pristine stacked films are immersed in BMI solutions of different concentrations and stretched to different strains for simultaneous CNT reorientation and resin infiltration. The films are finally pressed at low temperature for resin permeation and redistribution and high temperature for resin curing. The determining factors such as the alignment and mass fraction of CNTs and the distribution of BMI resin in the composite film can be easily tailored. Benefiting from the resultant excellent CNT alignment, high CNT content (61.4 wt%), and uniform distribution of the resin between CNTs, the composite film can achieve excellent mechanical properties, including a tensile strength of 4.18 GPa, elongation at break of 4.35%, Young's modulus of 145 GPa, and toughness of 94.2 J cm-3. Such a strength and toughness are superior to those for the CNT composites published in the literature so far.