中文摘要：

分析了电阻率和电阻几何系数对基于炭黑/硅橡胶的力敏导电橡胶的＂正拉力-电阻特性＂（positivetensile coefficient of resistance,PTCR）的影响程度,揭示了力敏导电橡胶拉伸过程的电阻变化机理。在一定拉伸范围内（40%）,当导电填料用量处在渗流区中心时,电阻率的增大是引起PTCR效应的主要原因。随着导电填料用量的增大,电阻几何系数的增大成为引起PTCR效应的主要原因。在某一特定导电填料范围内,力敏导电橡胶的＂正拉力-电阻特性＂还与拉伸长度有关。拉伸长度较小时,电阻几何系数的增大在PTCR效应中占主导;拉伸长度较大时,电阻率的增大在PTCR效应中占主导。

英文摘要：

The impact of resistivity and resistance coefficient of geometry on ＂positive tensile force coefficient of resistance （PTCR effect） of stretch-sensitive conductive rubber based on carbon black/silicon rubber materials was studied by the general effective medium theory, and then revealed the resistance changing principle of stretch-sensitive conductive rubber. In the tensile range of 40%, when the ratio of conductive filler was in the center of seepage zone, the increase of resistivity was the main reason for PTCR effect. With the increase of the conductive filler, the increase of the geometric coefficient of resistance was the main reason for PTCR effect. The ＂positive tensile force coefficient of resistance＂ （PTCR effect） of stretch-sensitive conductive rubber was related to the tensile length when the ratio of conductive filler in a particular range. The inrease of geometric 6＇ coefficient of resistance dominated in PTCR effect when the tensile length was small, the il ase of the resis- tivity dominated in PTVR effect when the pressure was large.