马来酸酐接枝聚丙烯/石墨导电纳米复合材料的研究

STUDY ON MALEIC ANHYDRIDE GRAFTED POLYPROPYLENE/GRAPHITE ELECTRICALLY CONDUCTIVE NANOCOMPOSITES

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 .

Maleic anhydride. grafted polypropylene (gPP)/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 gPP/EG composites were investigated by means of measurement of electrical conductivity (sigma) and OM, SEM and TEM observations. The results show that the percolation threshold at room temperature (phi(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 (phi(c) = 2.96 vol%). At EG content of 3.90 vol%, the a of the former attains 2.49 x 10(-3) S/cm, but that of the latter is only 6.85 x 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.