无机粒子对石墨烯微片／环氧树脂复合材料导电性能的影响

以 KNG-CZ030石墨烯（graphene nanoplatelets，GNPs）为导电填料，环氧树脂（E-54）为聚合物基体，2-乙基-4甲基咪唑（2，4-EMI）为固化剂，采用溶液混合和超声分散的方法制备导电复合材料。通过添加无机粒子（NaCl， TiO2），研究了无机粒子对石墨烯微片分散均匀性的影响以及对 GNPs ／E-54复合材料导电性能的影响。实验结果表明：加入 NaCl 和 TiO2提高了石墨烯微片在基体中的分散性，降低了复合材料室温体积电阻率，即提高了导电性能；NaCl ／GNPs ／E-54和 TiO2／GNPs ／E-54复合材料室温体积电阻率为106Ω·m 时，石墨烯质量分数分别为0．75％和0．73％，与未添加无机粒子的 GNPs ／E-54复合材料质量分数0．97％相比有所降低。

Effect of Nonconductive Inorganic Fillers on Electrical Properties of Epoxy/Graphene Nanoplatelets Composites

Conductive composite based on epoxy (bisphenol A,E-54)filled with graphene nanoplatelets (GNPs,KNG-CZ030 )and cured in the presence of 2-ethyl-4-methy imidazole(2,4-EMI)were prepared by solution blending assisted with ultrasonic dispersion. Nonconductive inorganic fillers(NaCl or TiO2 )were added as a second filler to study their effects on dispersal uniformity of GNPs and electrical properties of composite.It is found that by adding NaCl and TiO2 ,the dispersal uniformity of GNPs is improved and the con-ductivity of composite is increased with reduced room temperature resistivity .When the room temperature resistivity of NaCl /GNPs /E-54 and TiO2 /GNPs /E-54 composites is 106 Ω· m,their mass fractions are 0.75% and 0.72% respectively,which are lower than 0.97%,the mass fraction of GNPs /E-54 composite without adding inorganic particles.