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Abstract
ZnO and ZnAl2O4 nanoparticles (NPs) were successfully prepared by the co-precipitation method and characterized by x-ray powder diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. The prepared NPs were incorporated into epoxy (EP) coating with mass ratios 200 800 mg/kg of ZnO NPs/EP and ZnAl2O4 NPs /EP. The prepared coatings were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy, and their mechanical properties were investigated, at room temperature, after 5, 10, 15, and 20 days of preparation. Tensile tests showed an improvement in the tensile properties, with the best improvement in ultimate tensile strength (93.2%) for 800 mg/kg ZnAl2O4 NPs/EP coating after 15 days of preparation. The ZnO NPs/EP and ZnAl2O4 NPs/EP coatings exhibited noticeable sensitivity to the stretching rate. Vickers microhardness (Hv) investigations showed normal indentation size effect behavior for all the samples. The best improvement in Hv was attained after 5 days of preparation, for all coatings, with the best improvement (9.15%) for 700 mg/kg ZnO NPs/EP.
Highlights
Industrial interest in epoxy (EP) originates from its vast properties, including high chemical resistance, simple processability, good adhesion to heterogeneous materials, and excellent electrical insulation (Ma et al, 2018; Samad et al, 2018)
The results showed that the incorporation of zinc oxide nanoparticles (ZnO NPs) has improved the mechanical properties of the palm/EP
The results showed an enhancement in the tensile properties of EP coating upon the incorporation of ZnO and ZnAl2O4 nanoparticles, in which the best improvement in the ultimate tensile strength (UTS) of ZnO NPs/EP and ZnAl2O4 NPs/EP coatings was reached on day 10 and day 15, respectively
Summary
Industrial interest in epoxy (EP) originates from its vast properties, including high chemical resistance, simple processability, good adhesion to heterogeneous materials, and excellent electrical insulation (Ma et al, 2018; Samad et al, 2018). When cured, EP resin tends to become very brittle with low impact resistance and toughness This reduction in the mechanical properties of EP is due to the high cross-link density of the formed EP polymer Devaraju et al (Devaraju et al, 2020) investigated the tensile, impact, and flexural properties of polymer composite material using NaOH treated palm fibers and general EP resin as matrix, with and without ZnO NPs. The results showed that the incorporation of ZnO NPs has improved the mechanical properties of the palm/EP. Several research papers have discussed the effect of ZnO NPs on the mechanical properties of different coatings. The effect of ZnO and ZnAl2O4 nanoparticles on the tensile properties and the microhardness of EP coatings were investigated after 5, 10, 15, and 20 days of preparation.
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