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采用超声分散溶液混合法制备炭黑/碳纳米管/环氧树脂(CB/CNTs/EP)复合材料,研究了不同几何结构的炭系填料的导电作用,并且通过体积电阻率测试和扫描电镜等手段分别对其电性能和微观形貌进行了表征与分析。结果表明,在CB/CNTs/EP复合材料中,CB和CNTs按质量比4:1填充复合体系的渗流阈值为3.8%,介于两种填料单独使用时的两个渗流阈值之间。不同结构纳米材料(CB和CNTs)的混用会在环氧树脂体系中形成更稳定的导电网络,提高了复合材料的导电性。
The carbon / carbon nanotubes / epoxy composites (CB / CNTs / EP) were prepared by the ultrasonic dispersion mixing method. The conductivity of carbon-based fillers with different geometries was investigated. The volume resistivity and scanning electron microscopy Means were separately characterized and analyzed their electrical properties and micro-morphology. The results show that the CB / CNTs / EP composites have a percolation threshold of 3.8% at a mass ratio of 4: 1 in the CB / CNTs / EP composites, which is between the two percolation thresholds when the two fillers are used alone. The combination of different structural nanomaterials (CBs and CNTs) leads to a more stable conductive network in the epoxy resin system and improves the electrical conductivity of the composite material.