【摘要】 分别采用球磨和超声混合两种分散方法,制备聚酰亚胺(PI)/石墨烯(GNPs)复合材料。利用原子力显微镜、拉曼光谱、扫描电子显微镜、透射电子显微镜对其微观结构和形貌进行表征,研究了复合材料的电导率。结果表明,与超声混合法相比,球磨法制备的复合材料,GNPs均匀地包覆在PI颗粒表面,热压成型后形成更为完整的导电网络结构。GNPs质量分数为0.5%时就达到逾渗阈值;当GNPs质量分数为3%时,电导率到达最优值为1.94×10–2S/m。更多还原

【Abstract】 Polyimide/graphene composites were prepared by means of ball milling and ultrasonic mixing. Microstructure and morphology of composite materials were characterized by atomic force microscopy(AFM),Raman spectroscopy,scanning electron microscope(SEM) and transmission electron microscopy(TEM),and the electrical conductivity of composite materials was measured. The results show that,compared with the ultrasonic mixing method,the composite prepared by ball milling is uniformly coated with graphene on the surface of polyimide particles,and the more complete conductive network structure is formed during hot pressing. Besides,when the mass fraction of graphene is 0.5%,it reaches the percolation threshold. The optimal value of conductivity(1.94×10–2 S/m) is observed at 3 wt% graphene.更多还原