通过热处理方法得到表面不含羟基(—OH)的纳米MgO颗粒，采用母料法制备了10wt%纳米MgO/低密度聚乙烯(LDPE)复合材料，研究了纳米MgO/LDPE复合材料在70 kV/mm直流电场下的空间电荷特性，评估了该方法对纳米颗粒分散的效果及工业化应用推广价值。结果表明：表面羟基化对纳米 MgO/LDPE 复合材料变温体积电阻率及介电特性的影响不大，空间电荷积累量增加。当纳米 MgO 掺杂量为1 wt%时，复合材料的电性能最佳。
Nano MgO particles without hydroxyl group (—OH)on surface were prepared through hydrothermal method,and 10wt% MgO/low density polyethylene (LDPE)composites were prepared by master batch method. The space charge characteristics of nano MgO/LDPE composites under 70 kV/mm direct current fields were stud-ied.The dispersion effect of nanoparticles and the application promotional value in industry of this method were also evaluated.The results show that the effects of surface hydroxy on variable temperature volume resistivity and dielec-tric properties of nano MgO/LDPE composites were not remarkable,while space charge accumulates increase.When the concentration of nano MgO is 1 wt%,composite presentes the excellent electrical properties.
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