马来酸酐接枝聚丙烯/石墨导电纳米复合材料的研究

用溶液插层 (SI)法制备了马来酸酐接枝聚丙烯 (gPP) 膨胀石墨 (EG)导电纳米复合材料 ,以熔体混合(MM)法作对照 ,通过室温体积电导率 (σ)测试和OM、SEM、TEM观察 ,研究了复合材料的制备方法、微观结构和导电性能关系 .结果表明 ,SI法制得纳米复合材料的室温逾渗阈值c=0 6 7vol% ,远低于MM法制得复合材料的c=2 96vol% ;3 90vol%EG含量下 ,前者的σ达 2 4 9× 10 - 3S cm ,而后者的σ仅 6 85× 10 - 9S cm .产生上述差异的原因 ,与两种方法制得复合材料中EG分散相的形态及其内部微结构直接相关 .

STUDY ON MALEIC ANHYDRIDE GRAFTED POLYPROPYLENE/GRAPHITE ELECTRICALLY CONDUCTIVE NANOCOMPOSITES

Maleic anhydride grafted polypropylene (g PP)/expanded graphite (EG) electrically conductive nanocomposites were prepared via solution intercalation (SI) method.In contrast to melt mixing (MM) method,the relationships between preparation method,microscopic structure and conductivity of g PP/EG composites were investigated by means of measurement of electrical conductivity ( σ ) and OM,SEM and TEM observations.The results show that the percolation threshold at room temperature (  c) of the nanocomposites prepared via SI method is 0 67 vol%,which is much lower than that of the composites prepared via MM method (  c=2 96 vol%).At EG content of 3 90 vol%,the σ of the former attains 2 49×10 -3 S/cm,but that of the latter is only 6 85×10 -9 S/cm.The reason causing the differences mentioned above is directly related to the morphology and the internal microstructure of EG dispersed phase in the composites prepared via two methods.