He Lijuan, Ye Zhanzheng, Zeng Junji, Yang Xiong, Li Dawei, Yang Xiangyu, Chen Yu, Huang Yuewu
College of Science, Harbin University of Science and Technology, Harbin 150080, China.
Key Laboratory of Engineering Dielectric and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China.
Materials (Basel). 2022 Apr 13;15(8):2844. doi: 10.3390/ma15082844.
Low-density polyethylene (LDPE) has excellent dielectric properties and is extensively used in electrical equipment. Hexagonal boron nitride (h-BN) is similar to a graphite-layered structure, and alumina fiber (AlO) has high-temperature resistance and a strong performance. Herein, we prepared AlO-h-BN/LDPE nanocomposites by using LDPE as the matrix material and h-BN and AlO as the fillers. The influence of different doping contents and the mass ratio of AlO and h-BN (1:1) to LDPE on the electrical properties and thermal conductivity of the nanocomposites was examined. The results showed that the suppression effect on space charge was the most obvious and average. The charge density was the lowest and had the minimum decay rate when the doping content was 2%. The breakdown strength of the film reached the maximum value of 340.1 kV/mm, which was 12.3% higher than that of the pure LDPE (302.8 kV/mm). The thermal diffusivity of the composite sample was also higher than that of the single h-BN-doped sample when the content of h-BN and AlO was 7%. The thermal conductivity was 59.3% higher than that of the pure LDPE sample and 20% higher than that of h-BN/LDPE.
低密度聚乙烯（LDPE）具有优异的介电性能，广泛应用于电气设备中。六方氮化硼（h-BN）具有类似于石墨的层状结构，氧化铝纤维（AlO）具有耐高温性和良好的性能。在此，我们以LDPE为基体材料，h-BN和AlO为填料制备了AlO-h-BN/LDPE纳米复合材料。研究了不同掺杂含量以及AlO与h-BN（1:1）与LDPE的质量比对纳米复合材料电学性能和热导率的影响。结果表明，对空间电荷的抑制作用最为明显且平均。当掺杂含量为2%时，电荷密度最低且衰减率最小。薄膜的击穿强度达到最大值340.1 kV/mm，比纯LDPE（302.8 kV/mm）高12.3%。当h-BN和AlO的含量为7%时，复合样品的热扩散率也高于单一h-BN掺杂样品。热导率比纯LDPE样品高59.3%，比h-BN/LDPE高20%。
