摘要
多壁碳纳米管(MWCNTs)在增强增韧环氧树脂(EP)材料上发挥重要作用,但MWCNTs的表面活性不同,其力学性能、分散性、界面结合差异很大,这与EP复合材料的固化机理息息相关。为明确环氧树脂/碳纳米管(EP/MWCNTs)复合材料的固化机理,以及MWCNTs的引入对EP基体固化行为的影响机制,利用移动窗口二维相关红外和广义二维相关红外的分析方法,对比分析纯EP和EP/MWCNTs在升温固化过程中特征官能团的变化规律。结果表明:纯EP的固化过程主要是EP与伯胺基发生固化反应,EP开环生成新的羟基以及无环张力的C—H,而EP/MWCNTs在固化前期,其“位阻效应”阻碍EP的反应进程,MWCNTs的加入对其固化机理影响不大,不同的是EP/MWCNTs在固化过程中,固化剂中伯胺基的响应要先于环氧基发生。
Multi-walled carbon nanotubes(MWCNTs)play an important role in strengthening and toughening epoxy resin(EP)materials,but the surface activity of MWCNTs is different,and their mechanical properties,dispersion and interfacial bonding are very different,which is closely related to the curing mechanism of EP composites.In order to clarify the curing mechanism of epoxy resin/multi-walled carbon nanotube(EP/MWCNTs)composites and the influence mechanism of the introduction of MWCNTs on the curing behavior of EP matrix,the analysis methods of moving window 2D correlation infrared and generalized 2D correlation infrared were used to compare and analyze the variation of characteristic functional groups of pure EP and EP/MWCNTs during the heating and curing process.The results show that the curing process of pure EP is mainly the curing reaction between EP and primary amine group,and the ring opening of EP generates a new hydroxyl group and C—H without ring tension,while the'steric hindrance effect'of EP/MWCNTs hinders the reaction process of EP in the early stage of curing,and the addition of MWCNTs has little effect on its curing mechanism.The difference is that during the curing process of EP/MWCNTs,the response of the primary amine group in the curing agent occurs before the epoxy group.
作者
李璐
张贤明
周丽洁
LI Lu;ZHANG Xian-ming;ZHOU Li-jie(Engineering Research Center for Waste Oil Recovery Technology and Equipment,Ministry of Education,Chongqing Technology and Business University,Chongqing 400067,China;College of Architecture and Engineering,Chongqing Institute of Water Conservancy and Electric Power,Chongqing 402160,China;Chongqing Youth Vocational&Technical College,Chongqing 400712,China)
出处
《塑料科技》
CAS
北大核心
2024年第2期13-19,共7页
Plastics Science and Technology
基金
重庆市教委科学技术研究计划项目(KJZD-K202303802)
重庆市永川区自然科学基金项目(2023yc-jckx20078)。
关键词
多壁碳纳米管
环氧树脂
二维相关红外
固化机理
Multi-walled carbon nanotubes
Epoxy resin
2D correlation infrared spectroscopy
Curing mechanism
