摘要
通过对环氧树脂(EP)基复合材料施加载荷并分析由此产生的电学信号的变化,是未来设备损伤自监测的一个新方向。为了实现EP基复合材料在服役过程中的损伤自监测,以多壁碳纳米管(MWCNTs)作为EP的填充材料,利用非离子型分散剂(TritonX-100)对MWCNTs进行非共价处理并将其与EP共混,同时分别将含有羟基、羧基和氨基的MWCNTs与EP共混,制得非共价处理和共价处理的EP/MWCNTs复合材料。研究了这两种处理方式对EP/MWCNTs复合材料性能的影响,并与未处理的复合材料进行了对比,同时对所制备的EP/MWCNTs复合材料进行力-电协同试验,测试复合材料的压阻性能,探索复合材料的损伤自监测潜力。结果表明,当EP掺入共价处理的MWCNTs时,MWCNTs极性基团会与EP产生化学键,可以有效改善MWCNTs和EP材料的界面结合从而提升材料的力学性能,但共价处理破坏了MWCNTs结构,导致复合材料电导率相对较低。经实验验证,当EP中掺入非共价处理的MWCNTs时,MWCNTs可以实现单束分散,且在其质量分数为0.3%时使复合材料的拉伸强度比纯EP提高6.99 MPa,电导率上升4个数量级。当非共价处理的MWCNTs质量分数达到0.7%时,复合材料具有最大的压阻灵敏度,为4.5。
Analyzing the electrical signals changed by applying loads on epoxy resin(EP)based composites is a new direction for future equipment damage self-monitoring.In order to achieve damage self-monitoring of EP based composites during service,multi-walled carbon nanotubes(MWCNTs)were used as the filler material for EP,which were non-covalently treated using nonionic dispersant(TritonX-100)and then blended with EP,simultaneously,MWCNTs containing hydroxyl,carboxyl and amino groups were blended with EP,so the EP/MWCNTs composites with non-covalent and covalent treatments were prepared respectively.The effects of the two treating methods on the EP/MWCNTs composites were studied and compared with untreated composites.The mechanical electrical synergistic experiment was conducted on the EP/MWCNTs composites to test the piezoresistive properties and explore the potential of the composite damage self-monitoring.The results indicate that when covalently treated MWCNTs are added to EP,the polar groups of the MWCNTs can form chemical bonds with EP,which can effectively improve the interface bonding between MWCNTs and EP materials,thereby enhancing the mechanical properties of thecomposite.However,the covalent treatment damages the structure of MWCNTs,resulting in relatively low conductivity of the composites.Through experimental verification,when non-covalently treated MWCNTs are added to EP,MWCNTs can achieve single beam dispersion,and the tensile strength of the composite increases by 6.99 MPa compared to pure EP materials at a mass fraction of 0.3%MWCNTs,and the conductivity increases by 4 orders of magnitude.When the mass fraction of non-covalently treated MWCNTs is 0.7%,the composite has the maximum piezoresistive sensitivity of 4.5.
作者
李风
张密
于洲
张瑾
季志鹏
Li Feng;Zhang Mi;Yu Zhou;Zhang Jin;Ji Zhipeng(Technical Testing Center of Shengli Oilfield Branch of China Petroleum and Chemical Corporation,Dongying 257000,China;Shengli Oilfield Testing and Evaluation Research Co.,Ltd.of China Petroleum and Chemical Corporation,Dongying 257000,China;Beijing University of Chemical Technology,Beijing 100029,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2023年第10期14-23,共10页
Engineering Plastics Application
基金
中国石化股份公司重点实验室项目(KL22001)。
关键词
碳纳米管
复合材料
环氧树脂
压阻效应
carbon nanotubes
composite
epoxy resin
piezoresistive effect
