高电压技术2012，Vol.38Issue(10)：2755-2765,11.
低密度聚乙烯纳米复合材料中空间电荷积聚对试样厚度的依赖性
Dependence of Charge Accumulation in Low Density Polyethylene Nanocomposites on Sample Thickness
摘要
Abstract
The thickness of low density polyethylene(LDPE) nanocomposites varies greatly from decades of microns to centimeters,thus the dependence of charge accumulation in LDPE nanocomposites on sample thickness is investigated.Based on the existing LDPE nanocomposites,the space charge accumulation of unfilled LDPE and LDPE nanocomposite with different thicknesses were measured under 50 kV/mm electric field intensity by the pulsed electroacoustic(PEA) method.The experimental results show that the space charge accumulation in unfilled LDPE is little related to the sample thickness,but in LDPE nanocomposites it has strong dependence on the thickness.And the thicker sample had a better suppression of the heterocharge.In order to explain the different thickness dependence,a simulation based on the bipolar model and trapping potential model was introduced.The simulation explains the heterocharge formation in unfilled LDPE,and it is revealed that the nano-fillers can work as not only deep trap centers but also recombination centers which greatly influence the space charge accumulation.It is concluded that the difference of the thickness dependence of the two kinds of materials is caused by their different intensities of recombination.关键词
高压直流（HVDC）电缆/低密度聚乙烯（LDPE）/纳米复合材料/空间电荷/试样厚度/陷阱/复合作用/双极子模型Key words
high voltage direct current(HVDC) cable/low density polyethylene(LDPE)/nanocomposites/space charge/sample thickness/trap/recombination/bipolar model分类
化学化工引用本文复制引用
吕泽鹏,吴锴,王霞,成永红,刘通,李锐海..低密度聚乙烯纳米复合材料中空间电荷积聚对试样厚度的依赖性[J].高电压技术,2012,38(10):2755-2765,11.基金项目
国家重点基础研究发展计划（973计划） （）
国家自然科学基金 （）
