CB/LDPE纳米复合材料的空间电荷抑制特性

Space Charge Suppression Characteristics of Nano-CB/LDPE Composite

采用熔融共混法制备了纯低密度聚乙烯(LDPE)试样和纳米炭黑(CB)颗粒质量分数分别为0.01%、0.03%、0.05%、0.07%的CB/LDPE复合试样。采用扫描电子显微镜观察纳米CB颗粒在LDPE基体中的分散性,并利用电声脉冲法(PEA)测试各试样在常温和-40 kV/mm条件下的空间电荷积聚特性和陷阱特性,讨论纳米CB颗粒提升LDPE基体空间电荷抑制特性的机制。结果表明:相较于纯LDPE试样,CB/LDPE复合试样的空间电荷积聚特性得到了显著改善,其中CB质量分数为0.03%的CB/LDPE复合试样具有最佳的空间电荷抑制效果。纳米CB颗粒提高了复合试样内部的深陷阱密度,这是提高复合试样空间电荷抑制能力的关键。

Pure low density polyethylene(LDPE) and nano-carbon black(CB)/LDPE composite samples with 0.01%, 0.03%, 0.05%, and 0.07% mass fraction of nano-CB were prepared by melt blending method. The dispersity of nano-CB in LDPE was investigated by scanning electron microscope(SEM),and the space charge accumulation characteristics and trap characteristic of the samples at room temperature and-40 kV/mm were tested by pulsed electro-acoustic(PEA) method. The space charge suppression mechanism of LDPE increased by nano-CB was discussed. The results show that compared with LDPE,the space charge accumulation characteristics of the CB/LDPE composite samples are significantly improved, and the composite sample with 0.03% mass fraction of nano-CB shows the best space charge suppression effect. The addition of nano-CB particle increases the deep trap density in the composite samples, which is the key to improve the space charge suppression ability of composite samples.