Effectiveness of glycerol-monooleate in high-performance polymer tribo-systems
File(s)
Accepted version
Supporting information
Author(s)
Jiang, Shaoli
Yuan, Chengqing
Wong, Janet
Type
Journal Article
Abstract
High performance polymers possessing superior mechanical properties may replace metal components and improve machine efficiency. Successful replacement, however, relies on the compatibility of these polymers with current engineering systems, including lubricants and their additives. This study examines the compatibility of two high performance polymers, polyetheretherketone (PEEK) and polyamide-imide (PAI), with glycerol monooleate (GMO), an organic friction modifier (OFM) commonly used in steel-steel rubbing contacts. Friction tests were conducted with a ball-on-disc geometry in reciprocating motion at 100 °C in polyalphaolefin (PAO) base oil. GMO reduces friction in polymer-steel and polymer-polymer contacts. When steel is involved, the use of GMO and oleic acid (OA) give similar friction coefficients. Since OA is believed to be a hydrolyzed product of GMO in steel-steel contacts, our results show that the interaction of OA with steel controls friction in polymer-steel contacts when GMO is the additive. Results from FTIR and Raman spectroscopies show that steel surfaces contain little to no polymeric materials, nor iron oxides after rubbing against polymers in GMO- and OA-containing PAO. This supports OFM layers are formed on steel surfaces. These OFM layers prevent polymer transfer layer formation and possibly protect steel surfaces from oxidation. Our results show that using OFM that interacts strongly with steel can, contrary to dry friction, eliminate the need of polymeric transfer film on steel for achieving low friction in polymer-steel contacts.
Date Issued
2021-03
Date Acceptance
2020-10-28
Citation
Tribology International, 2021, 155, pp.1-9
ISSN
0301-679X
Publisher
Elsevier
Start Page
1
End Page
9
Journal / Book Title
Tribology International
Volume
155
Copyright Statement
© 2020 Published by Elsevier Ltd. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
https://www.sciencedirect.com/science/article/pii/S0301679X20305788?via%3Dihub
Subjects
0910 Manufacturing Engineering
0913 Mechanical Engineering
Mechanical Engineering & Transports
Publication Status
Published
Date Publish Online
2020-11-04