ABS/不锈钢纤维/石墨导电复合材料的导电特性

Study on conductive characters of ABS/stainless steel fiber/graphite conductive composites

以丙烯腈/丁二烯/苯乙烯共聚物(ABS)为基体,不锈钢纤维(SSF)和石墨为混杂导电介质制备了ABS/不锈钢纤维/石墨0-1-3复合体系。采用动态机械分析(DMA)、数字万用表和旋转流变仪等研究了复合材料的导电渗流行为、流变渗流特性的关联性及在DMA多频应变模式-动态微力场下的阻温特性与导电机理。结果表明,石墨的加入可明显提高复合体系的渗流导电能力;复合体系的导电渗流与流变渗流的渗滤阀值相近,均约为15%;在动态交变微载荷下,电阻率强烈的依赖于振动频率和温度,随着温度的升高,出现电阻正温度效应(PTC)和电阻负温度效应(NTC);且频率越高,SSF含量越低,复合体系的PTC转变温度越高。

ABS / stainless steel fiber / graphite composites were made by acrylonitrile / butadiene / styrene copolymer( ABS)as matrix and stainless steel fiber( SSF) and graphite as conducting medium. The association of conductive percolation behavior and rheological characteristic of conductive composites were studied,and the resistance-temperature properties and conductive mechanism were studied under DMA multifrequency strain mode and micro- dynamic force field. The results showed that the addition of graphite can obviously improve the seepage conductive ability of compound system. Resistivity showed the strong dependence of vibration frequency and temperature: resistance positive temperature effect(PTC) and resistance negative temperature effect(NTC) were appeared with increased temperatures. And the higher frequency,the lower content of SSF,the higher composite PTC transition temperature of the system.