Preparation of epoxypropyl functionalized graphene oxide and its anticorrosion properties complexed with epoxy resin
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Preparation of epoxypropyl functionalized graphene oxide and its anticorrosion properties complexed with epoxy resin Xiaofeng Yang*,†, Yuepeng Zhang*, Zhiping Chen*, Yinshuai Yang**, Hongxia Jing*, Zhenhao Sun*, and Huijie Wang* *School of Science, North University of China, Taiyuan 030051, China **School of chemical Engineering, Dalian Univesity of Technoloy, Dalian 116024, China (Received 17 April 2020 • Revised 2 July 2020 • Accepted 19 July 2020) AbstractFunctionalized graphene oxide (GO)/epoxy resin (EP) composite coating has attracted attention due to its advantages of epoxy resin in acid resistance, anticorrosion and having the characteristics of GO such as good chemical stability and strong electrolyte barrier properties. In this study, epoxypropyl functionalized graphene oxide (EFGO) was synthesized with a new strategy by grafting epichlorohydrin (ECH) onto the surface of GO. EFGO was then crosslinked with EP by diethylenetriamine (DETA) to fabricate EFGO/EP anticorrosive coating. The structure and property of EFGO and EFGO/EP were characterized and evaluated by various methods such as FTIR, Raman, XPS, SEM, and EIS. The results showed that the graft amount of epoxypropyl on GO surface could be effectively increased by using KI-KF catalysis system. The increase of the graft amount further improved the compatibility between EFGO and EP. EFGO/EP had a network structure with EFGO as the “central node”. The “central node” locked the movement of EP chain segment, as improving the thermal stability of EFGO/EP. The EFGO/EP coating fabricated by the EFGO, which grafted larger epoxypropyl, had good anticorrosion performance and adhesion with steel plates, showing a good barrier effect on electrolyte migration. The coating resistance reached up 4.88×108 cm2. Keywords: Epoxypropyl, Functionalized Graphene Oxide, Epoxy Resin, Anticorrosion
was to first introduce functional active group onto the surface of graphene to prepare functional graphene (FGO), and then combined with EP to obtain FGO/EP composites with good compatibility. There are two main strategies for fabrication of FGO at present. The first is by covalently grafting active groups such as NH2, phosphoric acid and imidazole ionic liquid on the surface of GO [9,10]. For example, P-phenylenediamine was covalently grafted on the surface of GO by Ramezanzadeh et al. [11], and then combined with EP using solvent evaporation method to prepare FGO/EP coatings. The resistance of the coating reached 7,300 Mcm2. After soaking the coating in 3.5 wt% NaCl solution for 20 days, the impedance values maintained about 61% of the original impedance values. For another example, N-(3-aminopropyl)-imidazole ionic liquid (IL) was used to modify GO by Liu et al. [12] to obtain ILGO. And then IL-GO was combined with EP to fabricate IL-GO/ EP composite coating. Both compatibility of GO with EP and corrosion durability of IL-GO/EP composite coatings were improved effectively. However, the modifiers o
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