MWCNTs/PP多层复合膜的结构及介电性能

将不同含量多壁碳纳米管(MWCNTs)的聚丙烯(PP)薄膜,通过热压叠层复合的方法制备了MWCNTs/PP多层复合膜。利用扫描电子显微镜(SEM)和电感电容电阻测试仪(LCR)研究了MWCNTs含量和多层结构对MWCNTs/PP多层复合膜介电性能的影响。结果表明:随着MWCNTs含量和复合层数的增加,低频下介电常数得到明显提高,介电损耗增加趋缓。结合微结构的表征结果,建立了微结构-介电性能之间的关系,导电层和绝缘层的交替结构使得MWCNTs/PP多层复合膜的介电常数显著提高,介电损耗仅有微小增加。

Structure and Dielectric Properties of Multilayered MWCNTs/PP Composite Membrane

Polypropylene(PP)thin membranes with different contents of multi-walled carbon nanotubes(MWCNTs)were used to prepare multilayered MWCNTs/PP composite membranes via hot-pressing lamination method.A combination of SEM and LCR analyzer was performed to study the influence of MWCNTs content and multilayered structure on dielectric properties of MWCNTs/PP composite membranes.The results show that the dielectric constant increases remarkably at low frequency with the increase of layer number and the MWCNTs content,while the dielectric loss shows a slow increase tendency.The relationship between the dielectric properties and structure is established based on the analysis of the microstructural results,and the dielectric constant of MWCNTs/PP composite membranes is enhanced remarkably with a little increase of dielectric loss,which is attributed to the alternating conductive and insulating layers.