中文摘要：

利用多壁碳纳米管（MWNTs）的横向电子波矢特性以及超级电容器的设计思路,在外加磁场条件下实现磁性碳纳米管（M-MWNTs）在聚合物基体中有序布列及分散,以获得性能优异的介电复合材料。利用光学显微镜、扫描电子显微镜和宽频介电谱仪等手段对M-MWNTs/聚合物复合材料的结构和性能进行了表征。结果表明,非定向M-MWNTs/聚苯乙烯（PS）复合材料的介电常数在MMWNTs质量分数为5%~7%之间发生突跃,从4.2至6.0,质量分数为9%时最大达到6.5;而定向条件下复合材料的介电常数在M-MWNTs质量分数为9%~11%时,从8突跃至13;当M-MWNTs质量分数为15%时介电常数最大达到14.6。介电损耗结果表明,定向对复合材料的介电损耗也有一定的影响,定向后复合材料介电损耗最大值从1下降至0.1。

英文摘要：

Taking advantage of the lateral electron wave vector features of multi-walled carbon nanotubes（MWNTs）and design ideas of super capacitor,in this paper,the ordered distribution of MMWNTs in polymer matrix were carried out under the assisting of magnetic field conditions to give the composites excellent dielectric property.The structures and properties of M-MWNTs/polymer composites were characterized by Raman spectroscopy,transmission electron microscopy and Novocontrol broadband dielectric spectroscopy.The results showed that,for non-alignment samples,the dielectric constant jumped from 4.2to 6.0when the mass fraction of MWNTs was 5%~7%.The maximum of dielectric constant reached 6.5while the MWNTs content was 9%.However,the dielectric constant of the alignment samples jumped from 8to 13 while the M-MWNTs amount was 9%~11%.When MMWNTs content was 15%,the dielectric constant could reach 14.6.The alignment method also had effect on the dielectric loss of the composites,its largest values decreased from 1to 0.1.