纳米石墨片/环氧树脂复合材料的制备及性能

分别采用低温固化剂和高温固化剂制备了纳米石墨片/环氧树脂复合材料。通过电阻测试仪和材料试验机研究了纳米石墨片的含量对复合材料导电性能和力学性能的影响规律，并将溶液混合法与直接混合法制备的复合材料的性能进行对比，同时比较了纳米复合材料的性能与微粉石墨/环氧树脂复合材料的性能。结果表明，溶液混合法制备的复合材料逾渗阈值更低，可得到填料质量分数达60%、体积电阻率为0.0085 Ω·cm的纳米复合材料。当填料质量分数高于4%时，纳米复合材料的力学性能低于微粉复合材料。

Preparation and properties of graphite nanosheets/epoxy composites

Graphite nanosheets/epoxy composites were prepared by the low curing mode and high temperature curing mode，respectively. The influence of the content of graphite nanosheets on the conductive properties and mechanical properties of composites were studied with the resistance testing and materials testing machines. The properties of composites prepared by the solution mixing method and directly mixing method were compared with each other，and the properties of nano-composites were compared with micro-powder composites. It was shown that the composites prepared by the solution mixing method could have lower percolation threshold. When the content of graphite nanosheets reached 60%，the volume resistivity was 0.0085 Ω·cm. The mechanical properties of nano-composites were inferior to the micro-powder composites with the filler content higher than 4.0%.