Oil‐Soluble Polymer Brush Grafted Nanoparticles as Effective Lubricant Additives for Friction and Wear Reduction

Wright, Roger A. E.; Wang, Kewei; Qu, Jun; Zhao, Bin

doi:10.1002/ange.201603663

Title: Oil‐Soluble Polymer Brush Grafted Nanoparticles as Effective Lubricant Additives for Friction and Wear Reduction

Journal Article · Mon Jun 06 00:00:00 EDT 2016 · Angewandte Chemie

DOI:https://doi.org/10.1002/ange.201603663· OSTI ID:1400979

Wright, Roger A. E. ^[1]; Wang, Kewei ^[1]; Qu, Jun ^[2];

^[1]

Department of Chemistry University of Tennessee Knoxville TN 37996 USA
Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge TN 37830 USA

Abstract The development of high performance lubricants has been driven by increasingly growing industrial demands and environmental concerns. Herein, we demonstrate oil‐soluble polymer brush‐grafted inorganic nanoparticles (hairy NPs) as highly effective lubricant additives for friction and wear reduction. A series of oil‐miscible poly(lauryl methacrylate) brush‐grafted silica and titania NPs were synthesized by surface‐initiated atom transfer radical polymerization. These hairy NPs showed exceptional stability in poly(alphaolefin) (PAO) base oil; no change in transparency was observed after being kept at −20, 22, and 100 °C for ≥55 days. High‐contact stress ball‐on‐flat reciprocating sliding tribological tests at 100 °C showed that addition of 1 wt % of hairy NPs into PAO led to significant reductions in coefficient of friction (up to ≈40 %) and wear volume (up to ≈90 %). The excellent lubricating properties of hairy NPs were further elucidated by the characterization of the tribofilm formed on the flat. These hairy NPs represent a new type of lubricating oil additives with high efficiency in friction and wear reduction.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE EE0006925

OSTI ID:: 1400979

Journal Information:: Angewandte Chemie, Journal Name: Angewandte Chemie Vol. 128 Journal Issue: 30; ISSN 0044-8249

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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