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采用超声处理方法将膨胀石墨剥离成微纳米石墨片,并以制备的微纳米石墨片为导热填料采用溶液共混法对聚偏氟乙烯(PVDF)进行改性,制备出微纳复合导热材料。通过扫描电子显微镜对其微观结构进行了表征,结果表明通过超声处理可以使膨胀石墨发生部分剥离得到微纳米石墨片。导热性能测试结果表明,复合材料的导热性能随着超声处理时间的增加而增加;当超声处理时间为150min时,复合导热材料的导热系数是膨胀石墨填充PVDF的1.8倍。
The expanded graphite was stripped into micro-nano graphite sheets by ultrasonic treatment, and the micro-nano graphite sheets were used as the thermal conductive filler to modify polyvinylidene fluoride (PVDF) by solution blending method to prepare micro-nano composite thermal conductive materials. The microstructure was characterized by scanning electron microscopy. The results showed that the micro-nano-graphite sheets could be partially peeled off by the ultrasonic treatment. The thermal conductivity test results show that the thermal conductivity of the composite increases with the increase of the ultrasonic treatment time. When the ultrasonic treatment time is 150min, the thermal conductivity of the composite thermal conductive material is 1.8 times that of the expanded graphite-filled PVDF.