为了研究聚乙烯材料的空间电荷特性,利用熔融法制备了N-乙基咔唑/LDPE复合材料,分析了N-乙基咔唑添加量对复合材料介电性能的影响.结果表明:随着N-乙基咔唑添加量的增加,复合材料的击穿场强和体积电阻率呈现先增长后降低的趋势,与LDPE相比,当N-乙基咔唑的添加量为1.0％时,复合材料的击穿场强提高了31.9％,体积电阻率提高了1.51倍;随着N-乙基咔唑添加量的增加,其对复合材料内部空间电荷的抑制效果呈现先增强后减弱的趋势,添加1.0％的N-乙基咔唑对复合材料内部的空间电荷抑制效果最好.
In order to study the space charge characteristics of polyethylene material,an N-ethyl-carbazole/ LDPE composite was prepared by melt blending method,and the influence of N-ethyl-carbazole content on the dielectric properties of the composites was analyzed.The results show that with the increase of N-ethyl-carbazole content,the breakdown strength and volume resistivity of the composite increase at first and then decrease.When the N-ethyl-carbazole content is 1.0％,the breakdown strength of the composites is 39.1％ higher than that of the polyethylene,and the volume resistivity is 1.51 times higher than that of the polyethylene.With the increase of N-ethyl-carbazole content,the suppression effect of N-ethyl-carbazole on the space charge of the composite enhences at first and then weakens,the composites with 1.0％ of N-ethyl-carbazole has the best suppression effect on space charge.
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