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...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。展开更多
Expanded graphite,prepared from the rapid heating of graphite intercalated compound,was blended with polystyrene via the intercalation and the in situ polymerization of styrene.SEM,STM and etc were used to characteriz...Expanded graphite,prepared from the rapid heating of graphite intercalated compound,was blended with polystyrene via the intercalation and the in situ polymerization of styrene.SEM,STM and etc were used to characterize the nanostructure of the expanded graphite the composite of polymer/expanded graphite,and the changes of the nanostructure during the rolling process.The graphite formed the nanostructure during the expanding process of the GIC.The nanosheets were confirmed to have been dispersed in polystyrene matrix with the thickness of 10～30 nm.The conductivity of PS/expanded graphite composite was sensitive to the rolling process.The intensive rolling caused great decrease in its conductivity,due to the destruction of conducting network.展开更多
文摘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。
文摘Expanded graphite,prepared from the rapid heating of graphite intercalated compound,was blended with polystyrene via the intercalation and the in situ polymerization of styrene.SEM,STM and etc were used to characterize the nanostructure of the expanded graphite the composite of polymer/expanded graphite,and the changes of the nanostructure during the rolling process.The graphite formed the nanostructure during the expanding process of the GIC.The nanosheets were confirmed to have been dispersed in polystyrene matrix with the thickness of 10～30 nm.The conductivity of PS/expanded graphite composite was sensitive to the rolling process.The intensive rolling caused great decrease in its conductivity,due to the destruction of conducting network.
