One-step “green” synthesis of dispersable carbon quantum dots/poly (methyl methacrylate) nanocomposites for tribological applications
作者： Maria Sarno , Waleed Ahmed Abdalglil Mustafa , Adolfo Senatore , Davide Scarpa
DOI: 10.1016/J.TRIBOINT.2020.106311
关键词: Chemical engineering 、 Polymer 、 One-Step 、 Methyl methacrylate 、 Citric acid 、 Composite number 、 Nanocomposite 、 Materials science 、 Oleic acid 、 Poly(methyl methacrylate)
摘要: Abstract Herein, the production of a poly (methyl methacrylate)/carbon quantum dots (PMMA/CQDs)-based composite has been proposed for first time through one-step, mild temperature, easily scalable oleic acid- and citric acid-based green synthesis. The consists an oil-compatible polymer matrix which locally releases anti-friction anti-wear CQDs under lubrication conditions. After extensive characterization, tribological tests were performed in commercial VG 220 at different temperatures, loads additive concentrations, showing remarkable performance. At 25 °C 19 N normal pressure, with 0.3 wt% PMMA/CQDs, 20.2% 41.6% reductions observed friction wear, respectively. Furthermore, viscosities measurements at both 40 °C 100 °C showed that nanocomposite presence did not substantially interfere oil rheological parameters.
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