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Anchor Group Bottlebrush Polymers as Oil Additive Friction Modifiers.

Authors
  • Kerr, Andrew1
  • Häkkinen, Satu1
  • Hall, Stephen C L1
  • Kirkman, Paul2
  • O'Hora, Paul2
  • Smith, Timothy2
  • Kinane, Christian J3
  • Caruana, Andrew3
  • Perrier, Sébastien1, 4
  • 1 Department of Chemistry, The University of Warwick, Coventry CV4 7AL, U.K.
  • 2 Lubrizol Limited, The Knowle, Nether Lane, Hazelwood DE56 4AN, Derbyshire, U.K.
  • 3 Rutherford Appleton Laboratory, ISIS Neutron and Muon Sourcey, Didcot OX11 0QX, U.K.
  • 4 Warwick Medical School, The University of Warwick, Coventry CV4 7AL, U.K.
Type
Published Article
Journal
ACS Applied Materials & Interfaces
Publisher
American Chemical Society
Publication Date
Oct 18, 2023
Volume
15
Issue
41
Pages
48574–48583
Identifiers
DOI: 10.1021/acsami.3c12628
PMID: 37811661
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Surface-tethered polymers have been shown to be an efficient lubrication strategy for boundary and mixed lubrication by providing a solvated film between solid surfaces. We have assessed the performance of various graft copolymers as friction modifier additives in oil and revealed important structure-property relationships for this application. The polymers consisted of an oil-soluble, grafted poly(lauryl acrylate) segment and a polar, linear poly(4-acryloylmorpholine) anchor group. Reversible addition-fragmentation chain transfer polymerization was used to access various architectures with control of the grafting density and position of the anchor group. Macrotribological studies displayed promising results with ≈50% reduction in friction coefficient at low polymer treatment rates. QCM-D experiments, neutron reflectometry, small-angle neutron scattering, and atomic force microscopy were used to gather detailed information on these polymers' surface adsorption characteristics, film structure, and solution behavior.

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