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      Block Copolymer Nanoparticles Prepared via Polymerization-Induced Self-Assembly Provide Excellent Boundary Lubrication Performance for Next-Generation Ultralow-Viscosity Automotive Engine Oils

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          Abstract

          Core cross-linked poly(stearyl methacrylate)–poly(benzyl methacrylate)–poly(ethylene glycol dimethacrylate) [S 31–B 200–E 20] triblock copolymer nanoparticles were synthesized directly in an industrial mineral oil via polymerization-induced self-assembly (PISA). Gel permeation chromatography analysis of the S 31–B 200 diblock copolymer precursor chains indicated a well-controlled reversible addition–fragmentation chain transfer dispersion polymerization, while transmission electron microscopy, dynamic light-scattering (DLS), and small-angle X-ray scattering studies indicated the formation of well-defined spheres. Moreover, DLS studies performed in THF, which is a common solvent for the S and B blocks, confirmed successful covalent stabilization because well-defined solvent-swollen spheres were obtained under such conditions. Tribology experiments using a mini-traction machine (MTM) indicated that 0.50% w/w dispersions of S 31–B 200–E 20 spheres dramatically reduce the friction coefficient of base oil within the boundary lubrication regime. Given their efficient and straightforward PISA synthesis at high solids, such nanoparticles offer new opportunities for the formulation of next-generation ultralow-viscosity automotive engine oils.

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          Most cited references 45

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          Living Free-Radical Polymerization by Reversible Addition−Fragmentation Chain Transfer:  The RAFT Process

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            Living Radical Polymerization by the RAFT Process

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              Living Radical Polymerization by the RAFT Process – A Second Update

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                Author and article information

                Journal
                ACS Appl Mater Interfaces
                ACS Appl Mater Interfaces
                am
                aamick
                ACS Applied Materials & Interfaces
                American Chemical Society
                1944-8244
                1944-8252
                20 August 2019
                11 September 2019
                : 11
                : 36
                : 33364-33369
                Affiliations
                []Dainton Building, Department of Chemistry, University of Sheffield , Brook Hill, Sheffield, S3 7HF South Yorkshire, United Kingdom
                []Lubrizol Ltd. , The Knowle, Nether Lane, Hazelwood, Derbyshire DE56 4AN, United Kingdom
                Author notes
                [* ]E-mail: m.derry@ 123456sheffield.ac.uk . Phone: +44(0)114-222-9503.
                [* ]E-mail: s.p.armes@ 123456sheffield.ac.uk . Phone: +44(0)114-222-9342.
                Article
                10.1021/acsami.9b12472
                7007003
                31430432
                Copyright © 2019 American Chemical Society

                This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.

                Categories
                Research Article
                Custom metadata
                am9b12472
                am9b12472

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