EP/MWCNTs复合材料的制备及其压阻性能
李风12，张密12，于洲12，张瑾12，季志鹏3
1.中国石油化工股份有限公司胜利油田分公司技术检测中心，山东东营 257000； 2.中国石油化工股份有限公司胜利油田检测评价研究有限
公司，山东东营 257000； 3.北京化工大学，北京 100029
Preparation of EP/MWCNTs Composites and Their Piezoresistive Properties
Li Feng12, Zhang Mi12, Yu Zhou12, Zhang Jin12, Ji Zhipeng3
1.Technical Testing Center of Shengli Oilfield Branch of China Petroleum and Chemical Corporation,Dongying 257000,China; 2.Shengli Oilfield Testing and Evaluation Research Co., Ltd.of China Petroleum and Chemical Corporation,Dongying 257000,China; 3.Beijing University of Chemical Technology,Beijing 100029,China
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/MW‐CNTs 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。
Abstract：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.
关键词：碳纳米管；复合材料；环氧树脂；压阻效应
Keywords：carbon nanotubes; composite; epoxy resin; piezoresistive effect
基金：中国石化股份公司重点实验室项目(KL22001)
本文引用格式：
李风，张密，于洲，等.EP/MWCNTs复合材料的制备及其压阻性能[J].工程塑料应用，2023，51(10)：14-23.
Li Feng，Zhang Mi，Yu Zhou，et al. Preparation of EP/MWCNTs composites and their piezoresistive properties[J]. Engineering PlasticsApplication，2023，51(10)：14-23.
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