作　　者： (王思蛟）; (查俊伟）; (党智敏）;

机构地区： 清华大学电机工程与应用电子技术系,北京100084

出　　处： 《绝缘材料》 2017年第8期65-69,共5页

摘　　要： 利用熔融共混和多层热压的方法制备了7种具有三明治结构的氧化铝/低密度聚乙烯(Al_2O_3/LDPE)纳米复合材料。通过扫描电镜对材料的断面进行分析,得到最佳的热压参数。利用激光闪射扩散热分析仪测试了复合材料的热导率,并通过电流测试平台研究了复合材料在不同温度(30℃、50℃)30 k V/mm电场下的电导变化趋势。结果表明:三明治结构1%Al_2O_3-LDPE/0.5%Al_2O_3-LDPE/1%Al_2O_3-LDPE复合材料的热导率最高,达到0.4 W/(m·K)。当温度升高时,材料的电导率变化不同,热导率高的材料电导率变化相对较小。 Seven kinds of Al_2O_3/LDPE nanocomposites with sandwiched structure were prepared by melt blending and multi-layer hot pressing. The cross section of the composites was analyzed via SEM to obtain the best hot-pressing parameters. The thermal conductivity of the composites was measured via la- ser flash diffusion heat analyzer, and the conductivity at different temperatures （30 ℃ and 50 ℃） was in- vestigated via the current test platform under 30 kV/mm. The results show that the thermal conductivity of 1%Al_2O_3-LDPE/0.5%Al_2O_3-LDPE/1%Al_2O_3-LDPE composite is the highest, which reaches 0.4 W/（m·K）. With the increase of temperature, the conductivity of the materials changes differently, and the conductivi- ty of the materials with high thermal conductivity changes lightly.

关 键 词： 三明治结构 纳米复合材料 热导率 电导率