文献类型：期刊文献

英文题名：Preparation of Carbon Nanotube/Epoxy Composite Films with Superior Tensile Strength and Toughness

作者：Zhang, Yi Hang[1]; Zhan, Hang[2]; Mo, Run Wei[2]; Zhang, Heng[1]; Wang, Jian Nong[2]

机构：[1] School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China; [2] School of Mechanical and Power Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240456837)

语种：英文

外文关键词：Carbon carbon composites - Carbon films - Fracture mechanics - Gluing - Nanocomposite films - Nanocomposite thin films - Spray pyrolysis

摘要：Carbon nanotubes (CNTs) have been considered as promising reinforcements for various composites due to their excellent mechanical properties. However, CNT/resin composites prepared so far still suffer from bad dispersion, low mass fraction, and poor alignment of CNTs and their weak bonding with the resin matrix. Herein, we report an effective strategy towards preparing CNT/epoxy (EP) composite films with excellent mechanical properties. Firstly, from floating catalytic spray pyrolysis, CNTs are continuously deposited on a substrate make a thin film. The pristine film is then immersed in solutions of different EP concentrations under pressure and stretched to different strains for resin infiltration and CNT reorientation. The film was finally pressed at a low temperature for resin redistribution and then at a high temperature for resin curing. The determining factors such as the alignment and mass fraction of CNTs and the distribution of EP resin in the composite film can be easily tailored. Benefiting from a high CNT content (60.56 wt.%), excellent CNT alignment from repeated prestretching, and uniform resin distribution between CNTs from pressurized impregnation and low temperature pressing, the composite film can achieve excellent mechanical properties, including a tensile strength of 4.1 GPa, elongation at break of 3.8%, and toughness of 77.9 J cm-3. Such a strength and toughness are superior to those for the previous CNT and carbon fiber composites published in the literature. ? 2024, The Authors. All rights reserved.