石墨/环氧树脂导电油墨复合材料的制备及性能研究

Study on Preparation and Properties of the Conductive Ink Composite Materials Composed of Flake Graphite/Epoxy

以环氧树脂(E-44)和片状导电石墨为基本原料,制备了导电油墨。采用电阻仪、热重分析、力学性能测试及扫描电镜研究了其导电性能、耐热性能、力学性能及形貌特征,阐述了石墨填充量与导电油墨电阻率之间的关系。结果表明,石墨填充量达到60%(质量分数)时,导电油墨的电阻率为0.1Ω.cm。导电油墨的力学性能良好,弯曲强度和断裂弯曲应变较纯的环氧树脂体系固化物分别提高了16.9%和17.6%。此外,TGA结果显示该体系还具有好的耐热性能。

The conductive ink was prepared using the basic material of epoxy resin（E-44） and conductive flake graphite. The conductivity, the heat resistance, mechanical properties and the micro-morphology of the cured polymers were investigated by electric resistance instrument, thermogravimetric analysis（TGA）, mechanical property test and SEM analysis. The relationship between conductive flake graphite contents and the resistivity of the conductive ink was discussed. The results indicate that the resistivity of the cured polymers with 60% （mass fraction） conductive flake graphite content is up to 0.1Ω·cm. The conductive ink exhibits high mechanical properties according to the results that flexible strength and fracture flexible strain increase by 16. 9% and 17. 6% in comparison to the pure epoxy resin, respectively. Furthermore, TGA shows the graphite/epoxy composite materials possess good heat resistance.