石墨烯-多壁碳纳米管协同增强环氧树脂复合材料的低温力学性能

Cryogenic mechanical properties of epoxy composites synergistically reinforced by graphene-multi-walled carbon nanotubes

为了提高环氧树脂的低温力学性能,采用石墨烯与多壁碳纳米管(MWCNTs)协同改性环氧树脂,系统研究了石墨烯-MWCNTs/环氧树脂复合材料的室温(RT)和低温(77K)力学性能。结果表明:当石墨烯的质量分数为0.1wt%,MWCNTs的质量分数为0.5wt%时,纳米填料的加入可同时改善环氧树脂的低温拉伸强度、弹性模量和冲击强度;在此最佳含量下,石墨烯-MWCNTs/环氧树脂复合材料在RT和77K时的拉伸强度皆达到最大值,比纯环氧树脂的拉伸强度分别提高了11.04%和43.78%。石墨烯和MWCNTs能协同提高环氧树脂的低温力学性能。

In order to enhance the cryogenic mechanical properties of epoxy,graphene and multi-walled carbon nanotubes(MWCNTs)were used to modify epoxy synergistically.Room temperature(RT)and cryogenic(77K)mechanical properties of graphene-MWCNTs/epoxy composites were systematically studied.The results show that simultaneous enhancements in cryogenic tensile strength,elastic modulus and impact strength can be achieved with0.1wt% graphene and 0.5wt% MWCNTs.At this optimal formulation,the tensile strength of graphene-MWCNTs/epoxy composites reaches the highest value at both RT and 77 K,and is increased by 11.04%and 43.78%respectively,compared to pure epoxy.The cryogenic mechanical properties of epoxy can be synergistically enhanced by graphene and MWCNTs.