不同制备工艺对硅橡胶智能复合材料应变传感肩峰现象研究  

Study on theshoulder peak phenomenon of strain sensing ofsilicone rubber intelligent composite by different preparation techniques

作　　者：万帮伟 杨洋[1,2] WAN Bangwei;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)

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

出　　处：《功能材料》2023年第12期12214-12218,共5页Journal of Functional Materials

基　　金：国家自然科学基金(11962009)。

摘　　要：导电聚合物复合材料通常使用弹性体作为应变传感材料的基体。然而,弹性聚合物复合材料在电阻-应变响应性能中通常表现出肩峰现象,从而限制应变传感材料的应用。以消除肩峰现象为目的,分别采用机械共混法与溶液共混法制备出多壁碳纳米管(MWCNT)/甲基乙烯基硅橡胶(VMQ)导电纳米复合材料,研究不同制备工艺对复合材料微观形貌、导电性能、应变传感性能的影响。结果表明:机械共混法制备出的复合材料,渗流阈值更低、灵敏度更高,电阻响应信号更加稳定,即使在2500次循环加载-卸载过程保持良好的稳定性及重复性,没有出现肩峰现象,同时解释了肩峰现象的机理。明确了该应变传感器具有对大变形隔震支座进行实时应变监测的潜力。Conductive polymer composites usually use elastomers as the matrix of strain sensors.However,elastic polymer composites often exhibit shoulder peak phenomena in the resistance response signal,which limits the application of strain sensors.In order to eliminate the acromion phenomenon,MWCNT/VMQ conductive nanocomposites were prepared by mechanical blending and solution blending respectively.The effects of different preparation processes on the microstructure,electrical conductivity and strain sensing properties of the composites were studied.The results show that the composite prepared by mechanical blending method has lower percolation threshold,higher sensitivity and more stable resistance response signal.It maintains good stability and repeatability even during 2500 cycles of loading and unloading process,and no acromion phenomenon occurs.The mechanism of shoulder peak phenomenon is explained.It is proved that the strain sensor has the potential of real-time strain monitoring for large deformation isolation bearing.

关 键 词：多壁碳纳米管 硅橡胶 溶液共混法 机械共混法 电阻-应变响应性能 肩峰现象 

分 类 号：TB332[一般工业技术—材料科学与工程]