Abstract
By the method of radioactive tracer, wear-reducing effectiveness of several series of aromatic compounds has been measured and compared with the coefficient of friction, the molecular orientation on metallic surfaces and the chemical structure. There seem to exist close relations among these characteristics.
Both the wear and friction in the boundary condition show almost similar tendencies and diminish as the alkyl chain becomes longer, but certain series of aromatic compounds have the best lubrication characteristics in the neighbourhood of 12 atoms of carbon.
The lubrication characteristics of dibenzoic compounds are different from those of aliphatic and monobenzoic compounds and the wear with the formers is relatively small in spite of a large friction.
