摘要： 为提高聚氨酯紫外光固化涂料的力学性能和导电性，基于聚氨酯化学反应，采用异佛尔酮二异氰酸酯（IPDI）和甲基丙烯酸羟乙酯（HEMA）对氧化石墨烯（GO）实现了化学接枝，制备出新型氧化石墨烯（HEMA@GO）。探讨了 HEMA@GO和多壁碳纳米管（MWCNTs）协同复合对聚氨酯基 UV固化涂层的机械强度和导电性的影响。结果表明：化学接枝型氧化石墨烯的层间距由接枝前的 0. 89 nm扩大到 2. 10 nm，改善了 GO在聚氨酯基体中的分散能力和界面相互作用；当 HEMA@GO和 MWCNTs的添加量分别为 1. 0%、3. 0%时，聚氨酯膜的拉伸强度和涂层硬度达到了最佳，分别为 13. 6 MPa和 6H。此外，HEMA@GO和 MWCNTs的协同作用，显著降低了聚氨酯涂层的方块电阻，从空白涂层的 10¹² kΩ/□降至 7. 1 kΩ/□，展现出优异的导电性和力学性能提升效果。

关键词: 聚氨酯 UV固化树脂, 改性氧化石墨烯, 多壁碳纳米管, 力学性能, 导电性

Abstract: To enhance the mechanical properties and electrical conductivity of polyurethane UV-cured coatings，by the chemistry reaction for polyurethane，isophorone diisocyanate（IPDI） and hydroxyethyl methacrylate（HEMA）were employed to prepare the chemical graft graphene oxide，such as a novel HEMA-grafted graphene oxide（HEMA@GO）. The synergistic effect of HEMA@GO and multi-walled carbon nanotubes（MWCNTs）on the mechanical properties and electrical conductivity of the polyurethane UV-cured coatings was investigated. The results showed that the interlayer space of the functionalized GO expanded from 0. 89 nm of GO to 2. 10 nm，and both the dispersion and interfacial bonding between GO and the polyurethane matrixwere enhanced significantly. With an increase of carbon materials in content，the tensile strengthand hardness of the films increased initially and then declined. The optimum tensile strength of 13. 6 MPa and hardness of 6H were achieved with the mixture HEMA@GO and MWCNTs at 1.0% and 3.0%，respectively. Moreover，the synergistic effect of HEMA@GO and MWCNTsmade the square resistance of the polyurethane coating decrease significantly，decreasing it from 10¹² kΩ/□ for the unmodified sample to 7. 1 kΩ/□ . This results highlighted thesubstantial enhancement in both electrical conductivity and mechanical performance.

Key words: polyurethane UV coatings, modified graphene oxide, multi-walled carbon nanotubes, mechanical properties, electrical conductivity

中图分类号: 

• TQ637. 83