多壁碳纳米管/天然橡胶复合材料压阻传感特性实验分析及理论预测  

Experimental analysis and theoretical prediction to piezoresistance sensing characteristics of multiwalled carbon nanotubes/natural rubber composite

作　　者：刘兴姚 郭荣鑫[1,2] 杨洋 范正明[1,2] 王洋 LIU Xingyao;GUO Rongxin;YANG Yang;FAN Zhengming;WANG 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;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,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]北京科技大学材料工程与科学学院,北京100083

出　　处：《复合材料学报》2023年第1期232-243,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(11962009)。

摘　　要：为实现对隔震支座工作性能的有效监测,采用开炼法制备了多壁碳纳米管(MWCNT)/天然橡胶(NR)复合材料,研究了该复合材料在恒应变和间歇加载下的电阻-应变响应行为。结果表明:MWCNT/NR复合材料电阻-应变响应稳定性、重复性、单调性、对称性及“肩峰”效应依赖恒应变载荷;随着间歇时间的增加电阻变化幅值趋于稳定,所建立的理论模型能有效预测该幅值变化。不同脱层形式下MWCNT/NR复合材料表现出不同的压阻行为,采用Digimat和Workbench解释了其响应机制。基于MWCNT导电网络和橡胶材料黏弹性,一个能够完整表征和预测循环电阻-应变响应的数学模型被提出和验证,模型拟合结果与实验结果高度吻合,为实现MWCNT/NR复合材料的工业应用奠定理论基础。A multiwalled carbon nanotubes(MWCNT)/natural rubber(NR)composite was prepared by two-roll method to achieve effective monitoring for the working performance of isolation bearings.The resistance-strain response behaviors of MWCNT/NR composites under constant strain and interval loading were studied.The results show that the stability,repeatability,monotonicity,symmetry and‘shoulder peak’effect of the resistance-strain response are depended on the constant strain loading.The variation amplitude of resistance tends to be stable with the increase of interval time,and the change of the amplitude can effectively be predicted via the theoretical model established.The piezoresistance behaviors for MWCNT/NR composite under different delamination forms show distinct characteristic,and the response mechanism is explained by Digimat and Workbench.A mathematical model that can completely characterize and predict the dynamic resistance-strain response was established and verified based on viscoelasticity of NR and conductivity network of MWCNT.The analytical results obtained by mathematical model are in good agreement with the experimental results,which lay a theoretical foundation for the industrial application of MWCNT/NR composites.

关 键 词：多壁碳纳米管/天然橡胶复合材料 电阻-应变响应 恒应变 间歇载荷 理论模拟 

分 类 号：TB332[一般工业技术—材料科学与工程]