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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Influence of hydrostatic pressure on dielectric properties of polyethylene/aluminum oxide nanocomposites
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Influence of hydrostatic pressure on dielectric properties of polyethylene/aluminum oxide nanocomposites

机译:静水压力对聚乙烯/氧化铝纳米复合材料介电性能的影响

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摘要

The effect of hydrostatic pressure on the dielectric characteristics of polyethylene/aluminum oxide nanocomposites is reported in the present work. Nanocomposite specimens with a thickness of 0.2mm were placed in a hydrostatic press at pressures ranging from 50 to 200 MPa. Then, ac and dc breakdown and dielectric spectroscopy measurements were carried out on the original and treated specimens. In comparison to the dielectric properties of the original specimens, the results of the treated specimens demonstrate some interesting dielectric behaviors. For example, the breakdown strengths of the treated specimens are enhanced, and the permittivity and dielectric loss are reduced after the hydrostatic pressure treatments. It is found that the movements of molecular chains and polar groups are restricted especially in the interfacial region, leading to the reduction in permittivity and dielectric loss of specimens after hydrostatic pressure treatment. The improvement in breakdown properties is due to the reduction in free volume or a more uniform size distribution of free volume in the nanocomposites after hydrostatic pressure treatments.
机译:在本工作中报道了静水压力对聚乙烯/氧化铝纳米复合材料介电特性的影响。将厚度为0.2mm的纳米复合材料样品放在静压机中,压力范围为50至200 MPa。然后,在原始和处理过的样品上进行了交流和直流击穿以及介电谱测量。与原始样品的介电性能相比,处理后的样品的结果显示出一些有趣的介电行为。例如,在静水压力处理之后,处理的样品的击穿强度提高,介电常数和介电损耗降低。结果发现,特别是在界面区域,分子链和极性基团的运动受到限制,导致静水压处理后样品的介电常数和介电损耗降低。击穿性能的改善归因于静水压力处理后纳米复合材料中自由体积的减少或自由体积的尺寸分布更加均匀。

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