| Abstract: | Three alkyloxy‐s‐triazine derivatives were synthesized and their tribological properties as lubricants for steel–steel contact were evaluated using an Optimol SRV tester at 20°C and 100°C. Their thermal stabilities were also investigated by thermogravimetric analysis. The results show that the three alkyloxy‐s‐triazine lubricants have good thermal stability. Moreover, 2,4,6‐tris(1,1,5‐tri‐H‐octafluoropentyloxy)‐1,3,5‐s‐triazine (FPOT) possesses the best anti‐wear property and good load‐carrying capacity both at 20°C and 100°C. At 20°C the anti‐wear effectiveness of 2,4,6‐tris(n‐pentyloxy)‐1,3,5‐s‐triazine (POT) is the worst, while at 100°C that of the 1,1,5‐tri‐H‐octafluoropentyloxy and/or 1,1,7‐tri‐H‐dodecafluoroheptyloxy tri‐substituted s‐triazine mixture (FMOT) is the worst. In addition, the friction‐reducing properties of the two fluoroalkyloxy‐s‐triazines, FPOT and FMOT, are not as good as those of the non‐fluorine‐containing alkyloxy‐s‐triazine POT. Scanning electron spectroscopy with an energy dispersive analyzer of X‐ray and X‐ray photoelectron spectroscopy analyses of the worn surface indicate that during the rubbing process, tribochemical reactions occur between the lubricants and the metal surface to generate a complex boundary lubrication film comprised of FeF2, Fe(OH)2, organofluorine and organonitrogen compounds. Copyright © 2006 John Wiley & Sons, Ltd. |
