双碳结构增强硅橡胶智能复合材料的力电响应
Mechanical and electrical response of silicon rubber intelligent composite materials reinforced by dual carbon structure
万帮伟 1杨洋 1赵艳芳1
作者信息
- 1. 昆明理工大学 建筑工程学院,昆明 650500;云南省土木工程防灾重点实验室,昆明 650500
- 折叠
摘要
可拉伸应变传感器在减隔震领域具有广阔的应用前景,然而,研发低成本和高稳定性可拉伸应变传感器仍然是一个巨大挑战.本文采用开炼法制备出多壁碳纳米管(MWCNT)-导电炭黑(CB)/甲基乙烯基硅橡胶(VMQ)导电纳米复合材料.研究MWCNT与CB之间的协同效应对复合材料分散性能、导电性能、力学性能及电阻-应变响应性能影响.结果表明:添加 CB后复合材料力学性能提升,具有较低的渗流阈值(1.24wt%),5 000次循环加载-卸载过程中表现出优异的电阻-应变响应稳定性.此外,MWCNT-CB/VMQ复合材料相比于MWCNT/VMQ、CB/VMQ复合材料在电阻-应变响应性能中没有出现肩峰现象,同时解释了肩峰现象机制.通过SEM发现复合材料中MWCNT和CB均匀分布及形成的协同效应是低阈值和稳定电阻-应变响应性能的重要原因.通过隧道效应理论模型解释了电阻-应变响应机制.该复合材料对减隔震结构应变监测具有巨大潜力.
Abstract
Stretchable strain sensors have broad application prospects in the field of vibration reduction and isola-tion,however,developing low-cost and high stability stretchable strain sensors remains a huge challenge.This article used the open melt method to prepare multi-walled carbon nanotubes(MWCNT)-conductive carbon black(CB)/methyl vinyl silicone rubber(VMQ)conductive nanocomposites.The effects of the synergistic effect between MWCNT and CB on the dispersion,conductivity,mechanical properties and resistance-strain response of the com-posites were investigated.The results show that the mechanical properties of the composite material are improved after adding CB,with a lower percolation threshold(1.24wt%),and excellent resistance strain response stability is demonstrated during 5 000 cycles of loading-unloading.In addition,compared to MWCNT/VMQ and CB/VMQ composites,the MWCNT-CB/VMQ composite did not exhibit shoulder peak phenomenon in the resistance-strain response performance,and explained the mechanism of shoulder peak phenomenon.Through SEM,it is found that the uniform distribution and synergistic effect of MWCNT and CB in the composite material are important reasons for the low threshold and stable resistance-strain response performance.The mechanism of resistance-strain re-sponse was explained through the tunnel effect theory model.This composite material has great potential for strain monitoring of seismic isolation structures.
关键词
多壁碳纳米管/炭黑/硅橡胶/电阻-应变响应/结构健康监测/智能传感材料Key words
multi-walled carbon nanotubes/carbon black/silicone rubber/resistance-strain response/struc-tural health monitoring/smart sensing composite引用本文复制引用
出版年
2024
NETL
NSTL
万方数据