Fabrication of graphene-coated poly(glycidyl methacrylate) microspheres by electrostatic interaction and their applicati
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Fabrication of graphene-coated poly(glycidyl methacrylate) microspheres by electrostatic interaction and their application in epoxy anticorrosion coatings Meng Li, Yiyi Li, Jiatian Zhang, Dandan Zhang, Jie Li, Kaibin He, Yiting Xu , Birong Zeng, Lizong Dai
Ó American Coatings Association 2020 Abstract The uneven dispersion of graphene in the resin matrix hinders its application in anticorrosion coatings. This study reports a new method where graphene oxide (GO) is coated on the surface of the poly(glycidyl methacrylate) (PGMA) microspheres to promote the dispersion of GO in epoxy resin (EP) to improve the anticorrosion performance of EP. GOcoated PGMA microspheres (PGMA@GO) were successfully fabricated by electrostatic interaction, which was confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and zeta potential analysis. The scanning electron microscopy results showed that the PGMA microspheres were uniformly coated with GO, when the weight ratio of PGMA@GO was 1:2 (PGMA: GO). Electrochemical impedance spectroscopy and salt immersion experiments were performed to evaluate the corrosion resistance of the EP composite coatings. Comparing with pure EP and GO/EP coatings, the mechanical properties and anticorrosion properties of coatings were improved after adding PGMA@GO. When the addition amount of PGMA@GO (of 50 g EP) was 1.0 wt% and about 0.67 wt% GO was only needed, the PGMA@GO/EP composite coating possessed a high impedance of Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11998-020-00409-1) contains supplementary material, which is available to authorized users. M. Li, Y. Li, J. Zhang, D. Zhang, K. He, Y. Xu (&), B. Zeng, L. Dai Fujian Provincial Key Laboratory of Fire-Retardant Materials, College of Materials, Xiamen University, Xiamen 361005, People’s Republic of China e-mail: [email protected] J. Li Fujian Inspection and Research Institute for Product Quality, Fuzhou 350002, People’s Republic of China
5.68 9 108 X cm2 and a low breakpoint frequency of 0.39 Hz for 21-day immersion in 3.5 wt% NaCl solution. The anticorrosion mechanism of PGMA@GO/EP composite coating was also discussed. Keywords Graphene, Anticorrosion coating, Epoxy resin, Poly(glycidyl methacrylate) microspheres
Introduction Graphene, a two-dimensional sheet material, is densely packed in a honeycomb lattice structure by single sp2bonded C atom; its C=C bond (sp2) length is about 0.142 nm,1–3 and its thickness is about 0.35–1 nm compared with the SiO2 substrate.4 Graphene attracts many researchers in various fields (including corrosion protection) with outstanding physical and chemical properties, excellent resistance to permeability, and small size effect.5,6 However, the strong Van der Waals force between graphene-based material sheets makes them easy to agglomerate in the polymer resin,7 so it is still a huge challenge to deal with the problem of dispersion and compatibility of graphene-based materials in the resin m
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