【作者】 刘平；

【导师】 黄英；

【作者基本信息】 合肥工业大学 ， 微电子学与固体电子学， 2010， 硕士

【摘要】 本文详细阐述了柔性触觉传感器用力敏导电橡胶的研究现状。通过扫描电子显微镜等仪器分析力敏导电橡胶的微观结构,研究了不同填料在橡胶母体中的网络化。以通用有效介质理论和隧道效应理论为基础,分析了炭黑填充导电橡胶的导电机理。采用通用有效介质模型研究力敏导电橡胶的工作原理与“负压力-电阻特性”的非线性行为,隧道效应模型研究力敏导电橡胶的量程与灵敏度。静态特性研究结果表明,在轴向压力作用下,压阻效应和应变效应是呈现“负压力-电阻特性”的主要原因。“负压力-电阻特性”的非线性行为主要由于电阻率的非线性减小和应力-应变关系的非线性特性。通过降低导电填料的用量以及增大导电橡胶的厚度可一定程度提高力敏导电橡胶的测量范围,而力敏导电橡胶的灵敏度主要取决于导电填料用量和弹性模量。通过分析导电橡胶的粘弹性,对导电橡胶的动态特性进行研究。动态特性研究结果表明,导电橡胶对力的响应时间短,可认为力的施加与材料的形变具有同时性。峰值时间,稳定时间,上升时间与导电橡胶的力学滞后相关。导电橡胶的频率响应特性良好,其响应幅值与导电橡胶的力灵敏度相关。更多还原

【Abstract】 This article elaborated on the status and progress of force-sensitive conductive rubber for flexible tactile sensor. Micro-structure of force-sensitive conductive rubber was investigated by scanning electron microscopy(SEM). The network of the different fillers in the rubber matrix was analyzed. The conductive mechanism of force-sensitive conductive rubber was researched based on conductive pathway theory and theory of electron tunnel.The working principle and nonlinear behaviour of negative pressure coefficient of resistance for force-sensitive conductive rubber were discussed by general effective media theory. Measure capacity and mechanical sensitivity of force-sensitive conductive rubber were analyzed by theory of electron tunnel. Under an un-axial pressure, it concluded that reason of negative pressure coefficient of resistance for force-sensitive conductive rubber was piezoresistive effect and strain effect. The nonlinear decrease of resistivity and stress-strain nonlinear laws result in nonlinear behaviour of negative pressure coefficient of resistance. With a certain range, reducing the filling ratio of filler and increasing the thickness of force-sensitive conductive rubber can rise the measure capacity of force-sensitive conductive rubber. Mechanical sensitivity of force-sensitive conductive rubber lies on the filling ratio of filler and elastic modulus.Dynamic characteristics of force-sensitive conductive rubber was discussed by viscoelasticity of force-sensitive conductive rubber. The result shows that the response time of the conductive rubber is short and force loading and sample resistance change occur simultaneously. The peak time, steady time, rise time of resistance associate with the loss modulus after force loading. Frequency response of force-sensitive conductive rubber is well, and response amplitude relate with mechanical sensitivity of force-sensitive conductive rubber.更多还原