CAJ | 학술논문

低密度聚乙烯（LDPE）纳米复合材料的厚度从μm级到cm级不等,差异极大。为此,研究了LDPE纳米复合材料中空间电荷的积聚对其厚度的依赖性。基于已有的LDPE纳米复合材料,采用电声脉冲（PEA）法测量了不同厚度的无掺杂LDPE及掺杂有纳米填料的LDPE纳米复合材料在50kV/mm电场强度下的电荷积聚特性。发现无掺杂LDPE中电荷积聚不随试样厚度发生明显变化;而LDPE纳米复合材料中电荷积聚对试样厚度有明显的依赖性：试样厚度越厚,异极性电荷的抑制效果越好。根据以上实验现象,以双极子模型为基础、结合陷阱势能理论进行仿真,探讨了无掺杂LDPE中异极性电荷的形成机理,指出纳米填料不仅作为陷阱中心而且作为复合中心直接影响着试样中空间电荷的积聚特性,2种材料不同的厚度依赖性是由于复合作用的强度不同而造成的。
저밀도취을희（LDPE）납미복합재료적후도종μm급도cm급불등,차이겁대。위차,연구료LDPE납미복합재료중공간전하적적취대기후도적의뢰성。기우이유적LDPE납미복합재료,채용전성맥충（PEA）법측량료불동후도적무참잡LDPE급참잡유납미전료적LDPE납미복합재료재50kV/mm전장강도하적전하적취특성。발현무참잡LDPE중전하적취불수시양후도발생명현변화;이LDPE납미복합재료중전하적취대시양후도유명현적의뢰성：시양후도월후,이겁성전하적억제효과월호。근거이상실험현상,이쌍겁자모형위기출、결합함정세능이론진행방진,탐토료무참잡LDPE중이겁성전하적형성궤리,지출납미전료불부작위함정중심이차작위복합중심직접영향착시양중공간전하적적취특성,2충재료불동적후도의뢰성시유우복합작용적강도불동이조성적。
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.