硅烷偶联剂优化多壁碳纳米管/硅橡胶复合材料的电阻-应变响应性能  

Silane Coupling Agent-modified Multi-walled Carbon Nanotube/Silicone Rubber Composites for Optimizing Strain Sensing Properties

作　　者：赵艳芳 车承文 万帮伟 沙洵 杨洋[1,2,3] ZHAO Yanfang;CHE Chengwen;WAN Bangwei;SHA Xun;YANG Yang(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Key Laboratory of Disaster Reduction in Civil Engineering,Kunming 650500,China;International Joint Laboratory for Green Construction and Intelligent Maintenance of Yunnan Province,Kunming 650500,China;The Nineth Engineering Co.,Ltd.of CCCC First Highway Engineering Co.,Ltd.,Guangzhou 511338,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]云南省土木工程防灾重点实验室,昆明650500 [3]云南省绿色建造与智慧运维国际联合实验室,昆明650500 [4]中交一公局第九工程有限公司,广州511338

出　　处：《材料导报》2024年第S02期475-479,共5页Materials Reports

基　　金：国家自然科学基金(52368043)。

摘　　要：通过溶液共混法制备出多壁碳纳米管(MWCNT)-硅烷偶联剂(KH550)/高温硫化硅橡胶(HTV)导电纳米复合材料,研究在KH550作用下复合材料的分散情况、导电性能以及电阻-应变响应性能。结果表明,将KH550作为改性剂,改善了MWCNT在基体中的分散性,提升了复合材料的整体性能。KH550的加入有效降低了复合材料的渗流阈值(1.51%),在较低的MWCNT含量下能够实现导电网络的形成。此外,复合材料展现出优异的应变传感性能,特别是在经过10000次循环加载-卸载测试后,依然保持了良好的稳定性和重复性,表明其在长期监测过程中具备高度的可靠性。同时,复合材料在电阻-应变响应性能测试中未出现肩峰现象。通过扫描电子显微镜(SEM)图像发现KH550改性后的MWCNT在基体中均匀分布,均匀分散的微观结构是电阻响应信号稳定的关键因素之一。此外,解释了复合材料的传感机理。优异的力电响应特性和长周期稳定性使该复合材料成为一种具有潜力的智能传感材料。Multi-walled carbon nanotubes(MWCNT)-silane coupling agent(KH550)/high-temperature vulcanized silicone rubber(HTV)conductive nanocomposites were prepared by the solution blending method.The preparation process of this composite significantly improved the dispersion of MWCNT in the matrix by using KH550 as a modifier,which enhanced the overall performance of the composite.The dispersion,electrical conductivity,and resistance-strain response characteristics of the composites in the presence of KH550 were investigated.The experimental results show that the incorporation of KH550 effectively reduces the percolation threshold of the composites(1.51%),which implies that the formation of conductive networks can be realized at a lower MWCNT content.In addition,the composites exhibit excellent strain sensing performance,especially after 10,000 cyclic loading-unloading tests,and still maintain excellent stability and repeatability,indicating a high degree of reliability in long-term use.More importantly,the resistance-strain response test showed no shoulder peaks.The scanning electron microscope(SEM)images revealed that the KH550-modified MWCNT was uniformly distributed in the matrix,and this uniformly dispersed microstructure was one of the key factors for the stability of the resistance response signal.The sensing mechanism of the composite is explained.The excellent force-electric response characteristics and long-period stability make it a potential material for smart sensing.

关 键 词：多壁碳纳米管 硅橡胶 电阻-应变响应 结构健康监测 

分 类 号：TB332[一般工业技术—材料科学与工程]