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Measurement of the Incremental Friction Coefficient of Several Homologous Series of Straight‐Chain Hydrocarbon Compounds
Author(s) -
Murray S. F.,
Burwell J. T.
Publication year - 1951
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.1951.tb54244.x
Subject(s) - hydrocarbon , adsorption , lubricant , homologous series , chemistry , chain (unit) , chemical polarity , coefficient of friction , friction coefficient , molecule , series (stratigraphy) , thermodynamics , chromatography , organic chemistry , materials science , composite material , physics , paleontology , astronomy , biology
Summary The incremental friction coefficient f Δ was measured as a function of speed for a number of straight‐chain polar hydrocarbon compounds. These compounds included alcohols, acids, amines, and two esters. In most cases, it was found to be independent of speed at slow speeds and decreased with speed at higher speeds. The amines were the only exception, in that the value of f Δ rose slightly with speed. The constant slow speed value of f Δ was found to decrease generally with increasing chain length in any single homologous series. There seems to be more correlation of the shape of this curve of f Δ vs. chain length with the surface metal than with the lubricant type. The friction of mixtures of two acids of rather different chain lengths showed no evidence of any strongly preferential adsorption of either component. This agrees with the relatively small difference in their adsorption energies. The friction of a dibasic acid was high and the damage to the surfaces was great. This agrees with what is known about the orientation of adsorbed molecules of compounds of this type.