文献类型：期刊文献

英文题名：Effects of oxidation-induced aggregation structure transformation of aramid fiber on interfacial adhesion of epoxy resin

作者：Li, Yang Liu, Wei Ma, Jiahao Lei, Jingjing Wang, Ziyi Yang, Le

第一作者：李杨

通信作者：Liu, W[1]

机构：[1]Guizhou Inst Technol, Sch Mat Sci & Energy Engn, Guiyang, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Sch Mat Sci & Energy Engn, Guiyang, Peoples R China.|贵州理工学院;

年份：2024

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20244517311779);Scopus(收录号：2-s2.0-85207888817);WOS:【SCI-EXPANDED(收录号:WOS:001343579500001)】；

基金：The authors gratefully acknowledge the National Natural Science Foundation of China (52363009), Guizhou Institute of Technology PhD start-up fund project (2023GCC003), Guizhou Provincial Science and Technology Projects (QianKeHeJiChu-ZK[2022]YiBan179), Innovative young scientific and technological talents training projects of Guiyang City (ZhuKeHeTong[2024]2-12) and Guizhou Colleges and Universities Process Industry New Process Engineering Research Center (Qian Jiao Ji [2022] 034).

语种：英文

外文关键词：composites; fibers; morphology; polyamides; surfaces and interfaces

摘要：The large-scale pretreatment and efficient surface activation of aramid fibers (AFs) before composite fabrication remains a major challenge. In this study, we developed a heat treatment-induced surface modification method to change the reactive groups on AFs. Results indicated that the O/C ratio and the number of ester groups on the AFs as well as the surface morphology of the AFs could be flexibly controlled using the heat treatment-induced surface modification method. Furthermore, the surface oxidation mechanism of the AFs changed from point oxidation to surface oxidation during heat treatment. As the heat-treatment time increased, the crystallinity and tensile strength of the AF monofilament considerably increased. An optimal heat-treatment time of 30 min was provided considering that long-time heating (>30 min) would destroy the surface molecular chains. Under this optimal heat-treatment time, the number of ester groups reached the maximum, which enhanced the reactivity of the AFs in the epoxy resin matrix. The interfacial shear strength between the AFs treated for 30 min and epoxy resin microdroplet increased by 12.64%, reaching as high as 18.17 MPa. Moreover, the contact angle between the AF monofilament and epoxy resin droplet reached a minimum value of 54.7 degrees. Furthermore, the thickness of the interfacial bond layer between the AFs and epoxy resin reached 50-60 nm. These results provide effective theoretical guidance for the large-scale application of AFs in composite materials.