烯丙基离子液体修饰炭黑/硅橡胶复合材料的压阻特性

为改善炭黑在硅橡胶中的界面性质,通过机械研磨法,采用1-烯丙基-3-甲基-咪唑氯盐对炭黑进行表面修饰,再与硅橡胶混炼制备炭黑填充硅橡胶柔性复合压阻材料,研究了修饰炭黑对复合材料的导电渗流和压阻行为、压阻松弛和循环特性的影响。扫描电镜表明,与未经修饰的炭黑对比,修饰炭黑在硅橡胶基体中形成炭黑离子凝胶结构。由于炭黑离子凝胶的增塑作用及在靠近时相互排斥和在远离时相互吸引作用,离子液体修饰炭黑/硅橡胶复合材料较炭黑/硅橡胶具有更敏感的正压阻效应和更短的压阻松弛时间,并且循环压缩测试结果表明离子液体修饰炭黑/硅橡胶复合材料电阻变化具有更好的可重复性。

Piezoresistive Properties of Nanocomposites Based on Silicone Rubber and Allyl Imidazolium Ionic Liquid-Functionalized Carbon Black

In order to improve interface properties of carbon black (CB)/silicone rubber (SR) composite materials,1-allyl-3-methylimidazolium chloride (IL) was used to modify CB.A novel polymer-based flexible piezoresistive composite was prepared by mechanical mixing of SR and IL modified CB,and their piezoresistive properties were carefully characterized.A well dispersity and CB-IL encapsulation structure is observed by morphology characterization.In electrical test,the SR/CB-IL composites show lower percolation threshold compared with SR/CB composites The SR/CB-IL composite with 6％ of CB-IL shows higher piezoresistivity,better repeatability and shorter relaxation time due to the plasticizing effect of IL and ion exclusion and attraction effect.The results suggest that the SR/6CB-IL composites provide a new route toward fabrication of flexible piezoresistive sensors and wearable electronic devices.