Dependence of Tribological Performance and Tribopolymerization on the Surface Binding Strength of Selected Cycloalkane-C
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ORIGINAL PAPER
Dependence of Tribological Performance and Tribopolymerization on the Surface Binding Strength of Selected Cycloalkane‑Carboxylic Acid Additives Qiang Ma1,3 · Arman Mohammad Khan1 · Q. Jane Wang1 · Yip‑Wah‑Chung1,2 Received: 24 March 2020 / Accepted: 7 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract We recently reported the use of cyclopropanecarboxylic acid (CPCa) as a model additive that can readily react under the combined effect of flash heating and stress in steel tribocontacts to form tribopolymers, along with marked improvement in tribological performance. In this paper, we present results of how chemical structural modification of CPCa may impact on the formation of tribopolymers and hence friction and wear properties, both by experiments and molecular dynamics simulation. Four lubricant additives, viz., CPCa, cyclobutanecarboxylic acid (CBCa), cyclopropane-1,1-dicarboxylic acid (CPDCa), and cyclobutane-1,1-dicarboxylic acid (CBDCa) consisting of a metastable ring structure and one or two carboxyl groups dissolved in an ester base oil were studied. Friction and wear rate using these additives rank in the order of CPDCa
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