摘要
通过机械共混法制备了甲基乙烯基硅橡胶(MVQ)/炭黑(CB)复合材料,研究了复合材料的压阻特性、温阻特性、在压缩循环下的压阻稳定性和重复性能以及电阻弛豫特性,并提出了新的压阻数学模型。结果表明,在渗滤阈值附近,MVQ/CB复合材料有最显著的压阻效应;随着CB含量的增加,压阻效应出现一个临界压力;在40℃时复合材料由正温阻特性转变为负温阻特性;通过预压缩和增加压缩循环次数,可以提高压敏导电橡胶的压阻重复性和稳定性。应用隧道电流理论构建的压阻效应数学模型能同时很好地模拟MVQ/CB复合材料的正压阻系数效应和负压阻系数效应。
The methyl vinyl silicone rubber/car- bon black（MVQ/CB） composites were prepared by mechanical mixing. Piezoresistive characteristic, thermoresistive characteristic, piezoresistive stability and repeatability at compression cycles, and resist- ance relaxation properties were studied. In addition, a novel piezoresistive mathematical model was put forward. The results showed that the composites had remarkable piezoresistive effect near the percolation threshold; piezoresistive effect exhibitied a critical pressure with the increase of the CB content; the thermoresistive characteristic transformed from posi-tire temperature coefficient effect to negative temper- ature coefficient effect at 40 % ; Through precom- pression and increasing compression cycles, the pie- zoresistive repeatability and stability were improved. The piezoresistive mathematical model derived from tunnel current theory could fit with the positive pres- sure coefficient effect and negative pressure coeffi- cient effect.
出处
《合成橡胶工业》
CAS
CSCD
北大核心
2012年第5期371-377,共7页
China Synthetic Rubber Industry
关键词
炭黑
甲基乙烯基硅橡胶
压阻特性
温阻特性
压阻稳定性
压阻重复性
压阻数学模型
carbon black
methyl vinyl siliconerubbe
piezoresistive characteristic
thermoresistivecharacteristic
piezoresistive stability
piezoresistiverepeatability
piezoresistive mathematical model
