【摘要】 制备了一种以氟碳树脂为基体,聚丙烯腈(PAN)基短切碳化纤维为导电填料的抗静电复合涂层。讨论了纤维的含量、长度、涂层厚度及外加电压对涂层表面电阻率的影响。结果表明表面电阻率和碳化纤维质量分数之间的关系符合逾渗理论,当纤维长度为4mm时,此体系的渗滤阈值为2.5‰(质量分数),其表面电阻率为106Ω,具有良好的抗静电性能;表面电阻率随纤维长度的增加而降低,但降低的程度愈来愈小;涂层厚度在不超过134μm的情况下,对表面电阻率的影响较小;涂层的表面电阻率在高外加电压下较低外加电压下小;碳化纤维/氟碳树脂复合涂层的导电机理是由导电通道、隧道效应和场致发射3种导电机理竞相作用的结果。更多还原

【Abstract】 A kind of antistatic coating was prepared with fluorocarbon resin as matrix,polyacrylonitrile(PAN)-based short carbonaceous fibers as conductive filler.The influences of fiber content,fiber length,coating thickness and applied voltage on the surface resistivity were discussed.The results show that the relationship between surface resistivity and mass fraction of carbonaceous fiber was suitable for percolation theory,and the percolation threshold is 2.5wt‰ when the length was 4mm;the coating has a surface resistivity of about 106Ω,and have a good antistatic function;surface resistivity decreases with increasing fiber length,but the extent taper off gradually;and yet,the thickness which is less than 134μm has little impact on it;surface resistivity was smaller in high applied voltage compared with low voltage.The conductive mechanism of the coating mainly depends on conductive path theory,tunneling effect and field mission.更多还原