RELATIONSHIPS AMONG ADDITIVE MOLECULAR STRUCTURE, RESIDUAL FILM FORMATION, AND BOUNDARY LUBRICATION BEHAVIOR

boundary-lubricating films, we used three physical quantities—the thickness of an oil film, breakdown ratio, and friction coefficient. The thickness and the breakdown ratio were measured by using a steel-oil-mercury system as an ideal system. The friction coefficient was measured by using a pendulum-type friction tester as a real system. The maximum contact pressure of the steel-oil-mercury system was approximately 300 Pa, while that of the pendulum-type friction tester was approximately 1 GPa. Despite the fact that the underlying working principles of these two systems are completely different, there exist strong relationships between them. By using these two systems, we were able to predict the friction coefficient on some level from the thickness and breakdown ratio