具有高压阻重复性和敏感性的纳米碳管复合硅橡胶  

Silicone rubber composite of high piezoresistance repeatability and sensitivity filled with carbon nanotubes

作　　者：张小祥[1] 巴龙[1] 

机构地区：[1]生物电子学国家重点实验室、东南大学生物科学与医学工程学院,南京220096

出　　处：《化工新型材料》2014年第10期25-27,共3页New Chemical Materials

基　　金：国家自然基金资助(10774022)

摘　　要：通过比较不同长径比的多壁纳米碳管复合硅橡胶的渗流特性发现长径比大于10000(长200μm,直径20nm)的长纳米碳管具有与长径比小于100(长2μm,直径20nm)的短纳米碳管显著不同的渗流特性,测量发现:随着导电相质量分数的增加,短纳米碳管呈现压阻系数由正到负的变化规律,而长纳米碳管即使导电相体积分数较低时也未呈现单调正的压阻系数,通过比较TEM和SEM照片,渗流曲线图以及对实验结果的分析,表明导电相的形貌对弹性体复合材料的压阻特性有很大影响。测量还表明对应最显著压阻变化率的质量分数长,短纳米碳管复合硅橡胶明显高于短纳米碳管复合硅橡胶,并且具有更高的压阻重复性,其在高体积分数下的高压阻敏感性、高补强作用及高压阻重复性使得该材料能用于柔性力敏传感器。Comparing the percolation of conductive rubber filled by carbon nanotubes which with different aspect ratio,the percolation had remarkable different was found. With the increasing of weight fraction of the conductive phase filled, the pressure coefficient of short nanotube（slenderness ratio was less 100）changed from positive to negative. While the long carbon nanotube （slenderness ratio was more than 10000）never had negative pressure coefficient of resistance（NPC effect）. It was found that the nanocomposites exhibited a distinct resistance vs stress behavior in the regime of elastic deformation. Comparing the TEM and SEM graphes of the composite, and considered the test result, the shape of conductive filler was found that was very important to the pie- zoresist change of the composite. And corresponding the maximum change of piezoresist, the long carbon nanotube conductive rub- ber weight fraction was bigger than short carbon nanotube and the long carbon nanotube mixed with short carbon nanotube conduc- tive rubber repeatability was obviously, so it can be used as soft force sensor.

关 键 词：纳米碳管 纳米复合橡胶 压阻特性 

分 类 号：TQ333.93[化学工程—橡胶工业] TB383.1[一般工业技术—材料科学与工程]