Influence of polyethyleneimine functionalized graphene on tribological behavior of epoxy composite
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Influence of polyethyleneimine functionalized graphene on tribological behavior of epoxy composite Shuo Li1 · Jianhua Zhang2 · Ming Liu1 · Rui Wang3 · Lixin Wu4 Received: 5 May 2020 / Revised: 25 September 2020 / Accepted: 22 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In order to improve the tribological properties of epoxy resin (EP), graphene was functionalized by an amine-riched polymer, polyethyleneimine (PEI) and then fabricated the P-GP/EP composites. The tribological behavior of P-GP/EP composites was investigated by wear testing machine and micro-scratch tester from macroscales and microscales, respectively. Meanwhile, the tensile strength and microhardness were also measured, and the fracture toughness of the composites was evaluated through micro scratch. The results showed that the friction and wear properties of P-GP/EP composites were improved both in macroscales and microscales, and the results of wear resistance were consistent under macro and micro tests. The wear rate in macroscale and volume loss in microscale were 76.76% and 51.34% lower than those of pure EP, respectively. The tensile strength, hardness and fracture toughness of the composites were also improved by the addition of P-GP. The fracture toughness of epoxy composites could be accurately evaluated based on linear elastic fracture mechanics (LEFM). Keywords Graphene · Epoxy · Tribological property · Micro scratch
* Ming Liu [email protected] * Rui Wang [email protected] 1
School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China
2
Fujian Special Equipment Inspection and Research Institute, Putian 351100, PR China
3
College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou 362000, China
4
Fujian Institute of Research On the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350000, China
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Vol.:(0123456789)
Polymer Bulletin
Introduction Epoxy resins (EPs) are widely used for anticorrosion coatings [1], adhesives [2], aerospace industry [3], electronic materials [4] and biomedical systems [5] owing to their excellent properties. However, the wear resistance of EP is relatively poor which limits their further application, especially in the abrasive tools [6]. Incorporation of abrasive fillers is a common method to produce the high wear resistant epoxy products due to the simple process and high industrial feasibility [7]. However, the abrasive fillers such as SiO2, Al2O3, SiC and diamond are usually microscaled, and their content is often very high (> 30 wt%) to meet the necessary wear resistance of the epoxy products which will lead to the deterioration of other properties [8–10]. Recently, the nanotechnology is developing rapidly and provides a method to fabricate polymeric composites with high comprehensive performances [11, 12]. It has been reported that the incorporation of nano-scaled fillers can significantly improve the wear resistance of polymer due to their high specific surface area and pr
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