通过实验研究了搅拌时间和炭黑表面改性对炭黑/环氧树脂导电复合材料电阻率和力电性能的影响.实验结果表明,随着搅拌时间的延长,炭黑在环氧树脂中的分散性提高,炭黑在环氧树脂中形成的一些导电链被破坏,从而导致复合材料的电阻率提高,电阻率变异系数减小及同批试件的电阻随应变的变化率趋于一致.但进一步延长搅拌时间并不能提高分散性,炭黑仍是以较大聚附体的形式存在.炭黑经偶联剂表面改性后,在环氧树脂中的分散性得到进一步的提高.改性后炭黑以小的聚附体甚至单颗粒的形式分散于环氧中,从而减小了复合材料中分布于炭黑颗粒间环氧树脂间隙的宽度,使复合材料的电阻率和电阻随应变的变化率减小.
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