Triple Function Lubricant Additives Based on Organic–Inorganic Hybrid Star Polymers: Friction Reduction, Wear Protection, and Viscosity Modification
| Autor: | Nicholas Cadirov, Bas G. P. van Ravensteijn, Craig J. Hawker, Jeffrey A. Gerbec, Takumi Watanabe, Jacob N. Israelachvili, Dongjin Seo, Raghida Bou Zerdan, Matthew E. Helgeson |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science Radical polymerization Dispersity Polymer architecture 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Methacrylate 01 natural sciences 0104 chemical sciences Viscosity chemistry Chemical engineering Polymerization General Materials Science Lubricant 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 11:1363-1375 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.8b16849 |
| Popis: | Polymer-based lubricant additives for friction reduction, wear protection, or viscosity improvement have been widely studied. However, single additives achieving all three functions are rare. To address this need, we have explored the combination of polymer topology with organic-inorganic hybrid chemistry to simultaneously vary the temperature- and shear-dependent properties of polymer additives in solution and at solid surfaces. A topological library of lubricant additives, based on statistical copolymers of stearyl methacrylate and methyl methacrylate, ranging from linear to branched star architectures, was prepared using ruthenium-catalyzed controlled radical polymerization. Control over the polymerization yielded additives with low dispersity and comparable molecular weights, allowing evaluation of the influence of polymer architecture on friction reduction, wear protection, and bulk viscosity improvement in a commercial base oil (Yubase 4). Structure-performance relationships for these functions were assessed by a combination of a high-speed surface force apparatus (HS-SFA) experiments, wear track profilometry, quartz crystal microbalance analysis, and solution viscometry. The custom-built HS-SFA provides a unique experimental environment to measure the boundary lubrication performance under extreme shear rates (≈10 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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