Generally, the electrical properties of nanocomposite are affected by the type, size, filling concentration and surface treatment process of the nanoparticle. In this study, nanocomposites of polyethylene (PE) with varying filling contents of nano-alumina particles were prepared by the melting blending method and three different kinds of coupling agents were applied for surface modification properties of the nanoparticles. Two of them were silane based and the other was titanate based. The effect of different coupling agents on the dielectric properties was studied. Fourier-transform infrared spectroscopy and thermo-gravimetric analysis were used to verify their compositions. Scanning electron microscope and polarised optical microscopy were used for morphology study. Dielectric permittivity, direct current (DC) volume resistivity and DC breakdown strength characterised their improved insulation performance with nano-alumina as filler. Thermal stimulated current results revealed that adding nano-alumina particles into low-density PE could provide more deep traps and increase DC resistivity.

通常，纳米复合材料的电性能受纳米颗粒的类型，大小，填充浓度和表面处理过程影响。在这项研究中，通过熔融共混方法制备了具有不同填充含量的纳米氧化铝颗粒的聚乙烯（PE）纳米复合材料，并使用三种不同的偶联剂对纳米颗粒进行表面改性。其中两个基于硅烷，另一个基于钛酸酯。研究了不同偶联剂对介电性能的影响。使用傅立叶变换红外光谱和热重分析来验证其组成。扫描电子显微镜和偏振光学显微镜用于形态研究。介电常数 直流（DC）体积电阻率和DC击穿强度的特征在于，使用纳米氧化铝作为填料改善了绝缘性能。热刺激电流结果表明，将纳米氧化铝颗粒添加到低密度PE中可以提供更多的深陷阱并增加DC电阻率。