石墨烯/高密度聚乙烯导电复合材料的制备与表征

Preparation and characterization of Graphene Nanosheets/ High Density Polyethylene Conductive Composites

采用氧化还原法制备了石墨烯(GNS),采用红外光谱、透射电子显微镜对所得石墨烯进行分析和表征。采用溶液共混法制备石墨烯/聚乙烯导电复合材料,研究了材料的导电渗流行为,发现石墨烯含量越接近渗流阈值(4.3%,质量分数),随着石墨烯含量的增加,其室温电阻率减少;当质量分数为6.3%左右时,电阻率趋于稳定,约为102Ω.m。DSC分析发现加入GNS后复合材料的降温过程中结晶峰起始温度提高,说明GNS在复合材料中有成核剂的作用。

Graphene nanosheets （GNS） was prepared by chemical oxidation-reduction method. And Fourier transform infrared spectroscopy （FTIR）, transmission electron microscopy （TEM） was used to characterize graphene oxide （GO） and GNS. GNS/high density polyethylene （HDPE） composite were prepared through solution mixing. The electrical properties of these composites were investigated. Percolation in GNS/HDPE composites occurs when the filler concentration is near 4.3% （mass fraition, same below）. The resistivity didn＇t change much when the weight fraction was above 6.5 （mass fraition, same below）%. DSC analysis reveals that the crystallization behavior of PE was significantly altered by addition of GNS, crystallization shifts to higher temperature during cooling, which indicates that GNS induces heterogeneous crystallization of PE.