Alkyl-Cyclens as Effective Sulfur- and Phosphorus-Free Friction Modifiers for Boundary Lubrication
| Autor: | Yip-Wah Chung, Massimiliano Delferro, David Pickens, Pinzhi Liu, Xingliang He, Q. Jane Wang, Tobin J. Marks, Jie Lu, Michael Desanker |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Materials science Metallurgy Base oil chemistry.chemical_element Friction modifier 02 engineering and technology Atmospheric temperature range 021001 nanoscience & nanotechnology Nitrogen Sulfur 020303 mechanical engineering & transports Adsorption 0203 mechanical engineering chemistry Chemical engineering General Materials Science Lubricant 0210 nano-technology Alkyl |
| Zdroj: | ACS applied materialsinterfaces. 9(10) |
| ISSN: | 1944-8252 |
| Popis: | Modern automotive engines operate at higher power densities than ever before, driving a need for new lubricant additives capable of reducing friction and wear further than ever before while not poisoning the catalytic converter. Reported in this paper is a new class of molecular friction modifier (FM), represented by 1,4,7,10-tetradodecyl-1,4,7,10-tetraazacyclododecane (1a), designed to employ thermally stable, sulfur- and phosphorus-free alkyl-substituted nitrogen heterocycles with multiple nitrogen centers per molecule. The multiple nitrogen centers enable cooperative binding to a surface which provides strong surface adsorption and lubricant film durability in the boundary lubrication (BL) regime. A 1 wt % loading of the cyclen FM 1a in Group III base oil exhibits strong surface adsorption, leading to excellent reductions in friction (70%) and wear (95%) versus the pure Group III oil across a wide temperature range. The lubricant with the new FM additive also outperforms two commercially available noncyclic amine-based FMs and a fully formulated commercial 5W30 motor oil. |
| Databáze: | OpenAIRE |
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