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研究了高密度聚乙烯 /炭黑导电复合材料在单轴压力作用下电阻的变化规律 .结果表明 ,在低压力下 ,复合材料电阻随压力增加而降低 ;而在较高压力下则随压力增大而升高 ,分别呈现出所谓的“电阻负压力系数”和“电阻正压力系数”效应 .电阻的压力依赖性以及由压缩引起的电阻不可回复性 ,被认为与外力作用下导电网络的重组与破坏有关 .由此提出了导电复合材料单轴压力作用 -电阻相互关系的唯象模型
The variation of electrical resistance of HDPE / carbon black conductive composites under uniaxial pressure was studied. The results showed that the electrical resistance of the composites decreased with the increase of pressure at low pressure, but decreased with the increase of pressure at higher pressure Large and high, respectively, showing the so-called “negative resistance coefficient of resistance” and “positive resistance coefficient of resistance.” The pressure dependence of resistance and resistance irreversibility due to compression are considered to be due to the recombination of the conductive network Which is related to the damage.Therefore, the phenomenological model of the relationship between the uniaxial pressure acting and electrical resistance of the conductive composite