利用纤维素纳米晶（CNC）修饰氧化石墨烯（GO）制备了纳米填料GC，并制备了环氧树脂（EP）/GC复合纳米材料，研究了GC对EP纳米复合材料的力学性能、动态机械性能和介电性能的影响。结果表明：相比单一纳米填料GO或CNC，复合填料GC能够更有效地提高EP复合材料的力学性能及黏弹性。EP/GC的介电常数提升效果最显著，介电损耗相对更低，接近纯EP的水平。添加GC后，EP/GC的电阻率从纯EP的8.23×10¹⁰ Ω·cm降至7.66×10⁸ Ω·cm。在0~50 kV的直流电场下，相比纯EP，EP/GC的击穿电压从29.45 kV升至36.57 kV，提升了24.2%。

Nano filler GC was prepared by modifying graphene oxide (GO) with cellulose nanocrystals (CNC), and epoxy resin (EP)/GC composites were prepared. The effects of GC on the mechanical properties, dynamic mechanical properties, and dielectric properties of EP nanocomposites were studied. The results show that compared with single nano filler GO or CNC, the composite filler GC can improve the mechanical properties and viscoelasticity of EP composites more effectively. EP/GC has the most significant dielectric constant improvement effect, and the dielectric loss is relatively lower, close to the level of pure EP. With the addition of GC, the resistivity of EP/GC decreases from 8.23×10¹⁰ Ω·cm of pure EP to 7.66×10⁸ Ω·cm. In the direct current field of 0~50 kV, compared with pure EP, the breakdown voltage of EP/GC is increased from 29.45 kV to 36.57 kV, with an increase of 24.2%.