【摘要】 使用高长径比填料，成功制备出了一种低逾渗阈值的非线性电导材料。采用混酸回流法制备了氧化多壁碳纳米管(Ox-MWCNTs),并以其为填料，使用涂覆工艺制备了一系列氧化多壁碳纳米管/聚醚酰亚胺(Ox-MWCNTs/PEI)复合薄膜。采用傅里叶变换红外光谱、X射线光电子能谱和扫描电子显微镜对氧化多壁碳纳米管的微观结构进行表征分析，并通过非线性电导性能和介电性能测试研究了填料含量对复合薄膜性能的影响。当Ox-MWCNTs的质量分数仅为3%时，复合材料就已经表现出了显著的非线性电导特性，非线性系数达到了6.2。同时，在保持低介电损耗的前提下，3%填料含量的复合材料的介电常数也从6.04提升到了14.56。更多还原

【Abstract】 A nonlinear conductive composite with a low percolation threshold was successfully prepared by using high-aspect-ratio oxidized multi-walled carbon nanotubes(Ox-MWCNTs), which were prepared by mixed acid reflux method, as fillers. A series of(Ox-MWCNTs)/polyetherimide(PEI) composites were prepared by blade coating. Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscopy were used to characterize the microstructure of(Ox-MWCNTs). The effect of filler content on nonlinear conductive characteristics and dielectric properties of the composite films were studied. The experimental results show that when the content of Ox-MWCNTs was only 3%, the composite material already exhibited remarkable nonlinear conductivity with a nonlinear coefficient of 6.2. At the same time, under the premise of maintaining low dielectric loss, the dielectric constant of the composite with 3% filler content was also increased from 6.04 to 14.56.更多还原