【摘要】 用溶液插层法制备了马来酸酐接枝聚乙烯 (MHA g PE) /膨胀石墨 (EG)导电纳米复合材料 ,并用XRD、TEM、SEM和光学显微镜对其结构进行了表征。研究表明 :采用此法制得的MHA g PE ,其室温逾渗阀值 (Φc=0 67% ) ,远低于采用常规熔体混合法制得的MHA g PE /EG复合材料的室温逾渗阀值 (Φc=2 74% )。在该导电纳米复合材料中 ,MHA g PE插入到EG石墨片层之间和石墨薄片孔隙之中 ,形成了纳米和微米尺度的MHA g PE/EG复合网络 ,使分散在MHA g PE基体中的EG粒子具有很大的宽厚比 ;能使EG在用量较低时 ,彼此靠近和接触 ,形成导电通路 ,故材料具有低Φc 和高导电性。更多还原

【Abstract】 A novel process was developed to prepare maleic anhydride grafted polyethylene (MMA-g-PE)/expanded graphite (EG) electro-conductive nano-composites by means of solution intercalation (SI), and the structure of the prepared composite was characterized by using XRD TEM?SEM and OM. The results showed the percolation threshold at room temperature ( Φ c) of the nano-composites was 0.67%, much lower than that of the composites prepared by melt-mixing (MM) ( Φ c =2.74%). The results also showed in the electricall conductive nano-composites, the MMA-g-PE molecules intercalated into the graphite sheets and the pores of thin slices, formed stable EG-MMA-g-PE networks of nano-scale and micro-scale , which made EG particles scattering in the MMA-g-PE matrix, having a great broad to thick ratio, and could be near to get in touch with each other at low content to form electrical conductive passageway, making the material possess low Φ c and high conductivity.更多还原