PEEK/MWCNTs复合材料性能研究

摘要

采用注塑成型制备了聚醚醚酮(PEEK)/多壁碳纳米管(MWCNTs)复合材料,探讨了MWCNTs的表面官能团和含量对PEEK/MWCNTs复合材料电性能、摩擦性能、力学性能及断面形貌的影响.结果表明,羟基和羧基的引入可显著提高复合材料的性能,改善界面结合情况,且随着MWCNTs含量的增加,复合材料的表面电阻率和磨损量明显降低,力学性能显著提高.MWCNTs-COOH加入后,出现逾渗现象,逾渗值为3％,表面电阻率达1.89×106Ω;摩擦系数降低,承载能力提高1倍以上;MWCNTs-COOH质量分数为4％时,磨损量为0.6 mg,比纯PEEK降低71.4％,综合性能最优.%Poly ether ether ketone (PEEK)/Multi-walled carbon nanotubes (MWCNTs)composites were prepared by injection moulding,and the effects of surface functional groups and contents of MWCNTs on the electrical properties,friction properties,mechanical properties and sectional morphology of PEEK/MWCNTs composites were investigated.The results show that the introduction of hydroxyl and carboxyl groups can significantly improve the properties of composites and the interfacial bonding.With the increase of MWCNTs,the surface resistivity and wear mass loss of the composites decrease obviously,and the mechanical properties of the composites increase significantly.After the addition of MWCNTs-COOH,percolation phenomenon occurs,and the percolation value is 3 ％,and the surface resistivity is 1.89 × 106 Ω.The friction coefficient is reduced and the bearing capacity is increased by more than 1 times.When the content was 4％,the wear mass loss is 0.6 mg,which is 71.4％ lower than that of pure PEEK,and the comprehensive performance is the best.