With the growing demand for electrical energy, the need for optimized designs of electrical insulating materials with dielectric, mechanical and thermal properties for many applications has become important. Polypropylene (PP) resin is widely used in high voltage apparatus for insulation. The addition of nanoparticles to a polymer seems to enhance the overall properties of the nanocomposite. In this work, the effect of nanoclay particles supplementation on optical and dielectric properties of PP nanocomposites was evaluated by means of several analytical techniques. UV–visible spectroscopy and dielectric spectroscopy in the frequency range 0.1 Hz to 1 MHz, and the temperature range between 40 C and 120 C. Optical properties were recorded at room temperature using UV–visible spectroscopy in the spectral range between 200 nm and 800 nm. The optical band gap was found to decrease with the supplementation of nanoclay while the refractive index increased. Dielectric spectroscopy showed the effect of nanoclay concentration in changing the dielectric relaxation behavior and the existence of interfaces between nanoparticles and polymer. The permittivity increase compared with unfilled PP was attributed to the appearance of two thermally activated relaxation processes in this frequency range.

随着对电能的需求的增长，对于具有许多应用的具有介电，机械和热性能的电绝缘材料的优化设计的需求变得重要。聚丙烯（PP）树脂广泛用于高压设备中进行绝缘。向聚合物中添加纳米颗粒似乎增强了纳米复合材料的整体性能。在这项工作中，通过几种分析技术评估了纳米粘土颗粒对PP纳米复合材料的光学和介电性能的影响。紫外可见光谱和介电谱在0.1 Hz至1 MHz的频率范围内，温度范围在40 C至120 C之间。使用紫外可见光谱在室温下在200 nm至800 nm的光谱范围内记录光学性质。发现随着纳米粘土的添加，光学带隙减小，而折射率增加。介电谱显示纳米粘土浓度在改变介电弛豫行为以及纳米颗粒与聚合物之间的界面存在方面的影响。与未填充的PP相比，介电常数的增加归因于在该频率范围内出现了两个热激活的弛豫过程。