Enhanced dielectric properties of polyethylene/hexagonal boron nitride nanocomposites

被引:0
作者
Raed Ayoob
Fuad Alhabill
Thomas Andritsch
Alun Vaughan
机构
[1] University of Southampton,The Tony Davies High Voltage Laboratory, School of Electronics and Computer Science
来源
Journal of Materials Science | 2018年 / 53卷
关键词
Nanocomposites; Breakdown Strength; Unfilled Polyethylene; Hexagonal Boron Nitride; Polyethylene Matrix;
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中图分类号
学科分类号
摘要
A range of nanocomposites based on a polyethylene polymer and hexagonal boron nitride (hBN) filler have been explored in this study. The dielectric properties of the nanocomposites, which consisted of 2, 5, 10, 20 and 30 wt% of hBN, have been compared to the dielectric properties of the unfilled polyethylene blend. Scanning electron microscopy revealed that the hBN was uniformly distributed in the polyethylene matrix, although large amounts of agglomerates were present in the nanocomposites containing more than 10 wt% of hBN. The incorporation of hBN into polyethylene resulted in a highly disordered morphology in comparison with the unfilled polyethylene, in which this effect was more pronounced with increasing hBN content. This is consistent with the increasing crystallisation temperature as the hBN content increases, as shown by differential scanning calorimetry, where the hBN acted as a highly effective nucleating due to the strong interactions between the polyethylene and the hBN. This strong interaction is again reflected in the thermal decomposition temperature which similarly increases with increasing hBN content. The study demonstrates the remarkable electrical properties of the prepared nanocomposites, where the breakdown strength monotonically increased as a function of hBN content, even with a very high 30 wt% of hBN. The improvement in electrical properties, even at high hBN concentrations, is contradictory to the reported results in the literature and is mainly attributed to the hydrophobic surface of the hBN particles.
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页码:3427 / 3442
页数:15
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