PEGlated graphene as nanoadditive for enhancing the tribological properties of water-based lubricant

被引：74
作者：
Hu Y. [1 ,2 ]
Wang Y. [1 ]
Zeng Z. [1 ]
Zhao H. [1 ]
Ge X. [2 ]
Wang K. [1 ]
Wang L. [1 ]
Xue Q. [1 ]
机构：
[1] Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo
[2] Nano Science and Technology Institute, University of Science and Technology of China, Suzhou
来源：
Carbon | 2018年 / 137卷
基金：
中国国家自然科学基金;
关键词：
High resolution transmission electron microscopy - Polyethylene glycols - Tribology - Suspensions (fluids) - Scanning electron microscopy - Wear of materials - Adhesives - Polyethylene oxides - Friction - Morphology - Photoelectron spectroscopy - Fourier transform infrared spectroscopy;
D O I：
10.1016/j.carbon.2018.05.009
中图分类号：
学科分类号：
摘要：
Dispersion of Graphene in water is conducive to their practical applications as lubricating additive in water-based fluids due to their safety, low cost and environmental-friendliness. But owing to its hydrophobicity, it is difficult to achieve stable aqueous graphene suspension. Here, we use the Toluene-2,4-diisocyanate as bridging agent between hydrophilic Poly (ethylene glycol) (PEG) and ethanolamine to prepare the amino-containing PEG (PEG-NH2), followed by covalently grafting PEG-NH2 onto the surface of carboxylaed graphene (G-COOH) nanosheets to synthesize the PEGlated graphene (PEG-G) via facile amidation under mild conditions. The physical, chemical properties of product were characterized by Fourier transformed infrared spectra (FTIR), Raman spectra, X-ray photo electron spectroscopy (XPS) and so on. Transmission electron microscopy (TEM) and scanning probe microscope (SPM) were utilized to observed the morphology of G-COOH and PEG-G. The frictional properties of PEG-G as nanoadditive of water-based lubricant were characterized by UMT-3 tribometer, following with analyzes on wear surfaces by 3D laser scanning confocal microscopy. Based on the results of characterization, the PEG-G was prepared successfully and the dispersion shows superior friction-reducing and anti-wear properties owing to the formation of fluid adhesive film and carbon protective film, especially the concentration of PEG-G in water is 0.05 wt%. © 2018 Elsevier Ltd
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页码：41 / 48
页数：7
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