含硫、氮杂环化合物摩擦学特性及其与结构相关性研究

用四球机和HQ-1环块实验机考察了2种具有相同原子组成、相似环结构的同分异构体(2-氨基苯并噻唑,2-巯基苯并咪唑)的摩擦磨损性能;用X射线光电子能谱检测了添加剂中和磨斑表面上元素的电子结合能,以确定2种杂环化合物的摩擦学作用机理.结果表明2种杂环化合物具有相似的摩擦学作用机制;且无论是减摩抗磨性能还是承载能力方面,2-氨基苯并噻唑均优于2-巯基苯并咪唑.同时还用分子轨道理论和氢键作用讨论了杂环化合物的结构对其摩擦学性能的影响.图4,表4,参11.

Structure-activity correlation for heterocyclic compounds containing nitrogen and sulphur on their tribological performance

The friction and wear performance of heterocyclic compounds (2-aminobenzothiazole and 2-mercaptobenzimidazole), which have the same element composition and similar cyclic structure except for the different atom position, added to liquid paraffin were evaluated using four-ball machine and HQ-1 block-on-ring tribotester. X-ray photoelectron spectroscopy (XPS) was used to examine the binding energy of elements on the rubbed surface and in additives in order to determine the action mechanism of heterocyclic compounds during rubbing. The results show that the two heterocyclic compounds possess the similar tribological action mechanism, and 2-aminobenzothiazole is superior to 2-mercaptobenzimidazole, either on the antiwear and friction reducing performance or on load-carrying capacity. At the same time, the effect of heterocyclic compound structure on tribological properties is discussed according the theory of molecular orbits and hydrogen bond action. 4figs.,4tabs., 11refs.