A study of the effect of chemical structure on friction and wear: Part 2 -Vegetable oils and esters

This paper continues the study of the effect of chemical structure on frict ion and wear characteristics of base stocks in the four-ball wear tester. T his study compares friction and wear properties of three vegetable oils and two synthetic esters based mainly on their chemical structure. The synthet ic esters selected use oleic acid in their respective processing that yield s products similar to vegetable oils. The vegetable oils chosen contain sig nificantly different chemical structure or fatty acid compositions. The res earch includes blending of various additives to determine additive effectiv eness in the different base stocks. To find the best linear regression mode l, the authors perform a best subset regression that also includes the oils in part 1. Finally, analysis of variance statistical methods evaluate oils from parts 1 and 2 to make final comments on chemical structure effects.