摘要
介绍一种填充碳纳米管 /石墨的复合型电磁波屏蔽膜的组成、制备及其耐老化性能 ,实验发现 :当碳纳米管 /石墨的配比为 1/7～ 1/2、有机聚合物 /导电填料的配比为 2 9.6 /70 .4～ 32 .4 /6 7.6时 ,该屏蔽膜具有最佳的电性能、屏蔽性能和加工性能 ,且在一定条件下具有负的温度系数。用多层结构模型讨论了该屏蔽膜的导电性 ,并与铜、镍蒸发膜的屏蔽特性进行了比较。
The fabrication of mixed style shielding film filled with carbon nanotubes/ graphite and the influence of their constitution and treat conditions on the conductivity and their ageing properties are presented. Based on experiments, it is found that the shielding films are of the best electronic, shielding and mechanical properties with the ratios of carbon nanotubes to graphite and organic polymer to conductive substance ranging from 1/7 to 1/2 and from 29.6/70.4 to 32.4/67.6 respectively, and in some conditions, they occur negative temperature coefficient. A formula of current density of shielding films can be derived from multiple layers structure model, whose theoretical value agrees with experimental results very well. It was compared between shielded properties of Cu and Ni vapour films and carbon nanotubes/graphite film.
