纳米复合聚合物界面电荷行为研究

发布时间：2018-01-20 03:49

本文关键词： 纳米复合聚合物聚乙烯 Zeta电位空间电荷电导　出处：《哈尔滨理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：纳米复合绝缘材料具有优良的空间电荷抑制能力和较高的直流击穿强度,可以应用于高压直流电缆的制造。但纳米复合材料改善介电性能的机理至今仍不清楚。研究者们提出了若干模型用来解释纳米电介质的介电性能变化,普遍的共识是纳米复合材料中存在着大量界面域,界面域中可能具有荷电层进而影响复合介质的宏观电性能。但至今仍无直接的实验证据来证实纳米复合介质中存在界面荷电层。本论文通过对比不同种类纳米颗粒分散在液体石蜡中的Zeta电位,测试了不同纳米填料的Zeta电位值。实验发现,不同填料的Zeta电位值与其制备的复合介质的直流电导率呈现负相关。应用Zeta电位值较高的纳米填料所制备的纳米复合介质具有更低的电导率。应用静电力显微镜,对比测试了纳米复合材料的远程相图。研究纳米复合材料的局域电荷行为,并探究了无机纳米颗粒在固态复合材料中的界面行为。实验发现,SiO2/LDPE和SiC/LDPE出现了明显的界面荷电分布,这两种纳米复合介质可以更好的抑制空间电荷。同时两种填料的Zeta电位绝对值也高于其他填料,这从一个侧面说明了Zeta电位和静电力显微镜测试是互相印证的。而具有明显界面荷电层的纳米复合介质具有更好的空间电荷抑制能力和更低的直流电导率。
[Abstract]:Nano-composite insulating materials have excellent space charge suppression ability and high DC breakdown strength. It can be used in the manufacture of HVDC cables, but the mechanism of improving dielectric properties of nanocomposites is still unclear. Researchers have proposed several models to explain the dielectric properties of nanocrystalline dielectrics. It is generally agreed that there are a large number of interfacial domains in nanocomposites. There may be a charge layer in the interface domain, which may affect the macroscopic electrical properties of the composite medium. However, there is no direct experimental evidence to confirm the existence of the interface charge layer in the nanocomposite medium. In this paper, we compare different kinds of nanocrystalline particles. The Zeta potential of particles dispersed in liquid paraffin. The Zeta potential of different nano-fillers was measured. The Zeta potential of different fillers is negatively correlated with the DC conductivity of the composite media prepared by different fillers, and the nano-composite media prepared with higher Zeta potential value has lower conductivity. Electrostatic microscope. The remote phase diagram of nanocomposites was tested, the local charge behavior of nanocomposites was studied, and the interface behavior of inorganic nanoparticles in solid-state composites was investigated. The interface charge distribution between SiO2/LDPE and SiC/LDPE is obvious. These two nano-composite media can better inhibit the space charge. At the same time, the absolute value of Zeta potential of the two fillers is higher than that of other fillers. This shows that the Zeta potential and the hydrostatic microscope test are mutually consistent, while the nano-composite medium with obvious interface charge layer has better space charge suppression ability and lower DC conductivity. .
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O631.23;TB383.1

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