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采用先溴化再置换的方法合成了两种胍盐离子液体,利用热重分析仪评价了离子液体的热稳定性。研究了这两种胍盐离子液体的摩擦学性能,在扫描电子显微镜下观察了磨斑表面形貌,并与膦嗪以及全氟聚醚和烷基咪唑离子液体进行对比。用X射线光电子能谱仪(XPS)分析了润滑机理。结果表明:与膦嗪、全氟聚醚以及烷基咪唑离子液体相比,胍盐离子液体对钢/钢摩擦副具有非常好的润滑作用,其承载能力最强,摩擦系数最小,磨痕最浅,并且增长链长可以有效地提高其减摩抗磨效果。
Two kinds of guanidinium ionic liquids were synthesized by the first bromination and then displacement method. The thermal stability of ionic liquids was evaluated by thermogravimetric analyzer. The tribological properties of the two guanidinium ionic liquids were investigated. The morphology of the wear scar was observed under scanning electron microscope (SEM) and compared with that of the phosphazene, perfluoropolyether and alkylimidazolium ionic liquids. The lubrication mechanism was analyzed by X-ray photoelectron spectroscopy (XPS). The results show that the guanidine salt ionic liquid has a very good lubricating effect on the steel / steel friction pair compared with the phosphazene, perfluoropolyether and alkyl imidazolium ionic liquids, and has the strongest bearing capacity and the lowest friction coefficient. Light, and increase the chain length can effectively improve its anti-friction and anti-wear effect.