Cheng Yujia, Yu Guang
Mechanical and Electrical Engineering Institute, University of Electronic Science and Technology of China Zhongshan Institute, Zhongshan 528400, China.
Molecules. 2025 Apr 25;30(9):1914. doi: 10.3390/molecules30091914.
Although polyethylene is widely used in electrical insulation, it does not possess dielectric properties. It is therefore desirable to develop insulation materials with excellent dielectric properties. In this study, low-density polyethylene (LDPE) was used as a matrix resin, while MgO, wollastonite, and montmorillonite (MMT) were employed as inorganic nano-additives. Three composites were prepared using the boiling-melt blending approach. Power frequency breakdown tests were performed on the original LDPE and on the prepared nanoparticle/LDPE composites. Upon combination with the Weibull distribution, the breakdown test results revealed that the addition of these nano-additive particles to the LDPE matrix increased the breakdown field strength of the material. The highest breakdown field strength for the nano-MgO/LDPE composite was obtained using a MgO loading of 0.5%. Notably, the obtained value was 1.8% higher than that of the pure LDPE. In addition, the highest breakdown field strength for the nano-wollastonite/LDPE composite was obtained using a wollastonite loading of 1% (7.48% higher than that of pure LDPE). Similarly, the highest breakdown field strength of the nano-MMT/LDPE composite was obtained using an MMT loading of 3%, giving a value that was 6.67% higher than that of the pure LDPE.
尽管聚乙烯广泛应用于电气绝缘领域，但它并不具备介电性能。因此，开发具有优异介电性能的绝缘材料是很有必要的。在本研究中，低密度聚乙烯（LDPE）被用作基体树脂，而氧化镁、硅灰石和蒙脱石（MMT）则被用作无机纳米添加剂。采用沸腾熔融共混法制备了三种复合材料。对原始LDPE和制备的纳米颗粒/LDPE复合材料进行了工频击穿试验。结合威布尔分布，击穿试验结果表明，向LDPE基体中添加这些纳米添加剂颗粒提高了材料的击穿场强。纳米氧化镁/LDPE复合材料在氧化镁负载量为0.5%时获得了最高击穿场强。值得注意的是，该值比纯LDPE高出1.8%。此外，纳米硅灰石/LDPE复合材料在硅灰石负载量为1%时获得了最高击穿场强（比纯LDPE高7.48%）。同样，纳米MMT/LDPE复合材料在MMT负载量为3%时获得了最高击穿场强，该值比纯LDPE高6.67%。
