Lee J H, Rhee K Y
Mechanical Engineering, KyungHee University, Yongin 446-701, Korea.
J Nanosci Nanotechnol. 2009 Dec;9(12):6948-52. doi: 10.1166/jnn.2009.1618.
Functionalization of carbon nanotubes (CNTs) influences dispersion and interfacial strength in CNT-reinforced nanocomposites. In this study, multi-walled CNTs were functionalized via oxidation with a mixture of sulfuric acid (H2SO4) and nitric acid (HNO3). Then, the functionalized CNTs with oxidation were surface-modified using a coupling agent, 3-aminopropyltriethoxysilane. CNT/epoxy nanocomposites were fabricated using oxidized CNTs and silane-modified CNTs, respectively, to investigate the effect of silane treatment on the tribological behavior of CNT/epoxy nanocomposites. Wear tests were performed on oxidized and silanized CNT/epoxy nanocomposites, at three different sliding speeds. The results showed that the friction coefficient and wear rate of silanized CNT/epoxy nanocomposites were lower than those of oxidized CNT/epoxy nanocomposites, regardless of sliding speed. The improved tribological behavior of silanized CNT/epoxy nanocomposites occurred due to the improved dispersion of CNTs into the epoxy and improved adhesion with the epoxy.
碳纳米管（CNT）的功能化会影响CNT增强纳米复合材料的分散性和界面强度。在本研究中，多壁碳纳米管通过用硫酸（H2SO4）和硝酸（HNO3）的混合物进行氧化来实现功能化。然后，使用偶联剂3-氨丙基三乙氧基硅烷对氧化后的功能化碳纳米管进行表面改性。分别使用氧化后的碳纳米管和硅烷改性的碳纳米管制备了CNT/环氧树脂纳米复合材料，以研究硅烷处理对CNT/环氧树脂纳米复合材料摩擦学行为的影响。在三种不同的滑动速度下，对氧化和硅烷化的CNT/环氧树脂纳米复合材料进行了磨损试验。结果表明，无论滑动速度如何，硅烷化的CNT/环氧树脂纳米复合材料的摩擦系数和磨损率均低于氧化后的CNT/环氧树脂纳米复合材料。硅烷化的CNT/环氧树脂纳米复合材料摩擦学行为的改善是由于碳纳米管在环氧树脂中的分散性提高以及与环氧树脂的粘附性增强所致。
