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Abstract
The study of various alkoxy species on metal surfaces has provided insight into the mechanism by which carbon is deposited into the lubricating films of polyphosphate glass generated by arylphosphate vapor phase lubricants. Previous work using trimethylphosphite has suggested that one of the initial steps in the decomposition of organophosphorus compounds on metal surfaces is cleavage of P-O bonds to produce adsorbed alkoxy species. In the case of alky I alkoxy groups (poor ligands for vapor phase lubrication) there are reaction mechanisms such as β-hydride elimination which efficiently remove hydrocarbons from the surface. In the case of the aryl alkoxy groups (good ligands for vapor phase lubricants) such mechanisms cannot be active due to the lack of β-hydrogen atoms. Experiments using various alkoxy species demonstrate these differences and reveal that phenoxy groups deposit carbon onto the surface quite efficiently while cyclohexanoxy and t-butanoxy groups do not.
Presented at the 55th Annual Meeting Nashville, Tennessee May 7–11, 2000
Notes
Presented at the 55th Annual Meeting Nashville, Tennessee May 7–11, 2000
