Custom-Made Chemically Modified Graphene Oxide to Improve the Anti-Scratch Resistance of Urethane-Acrylate Transparent Coatings

Abstract

In this work, a thermoset ultraviolet (UV)-cured polyurethane-acrylate resin was doped with different chemically-modified graphene obtained from a commercial graphene oxide (GO): as-received GO, chemically reduced GO (rGO), GO functionalized with vinyltriethoxysilane (VTES) (GOvtes), and GO functionalized with VTES and subsequently reduced with a chemical agent (rGOvtes). Modified graphene was introduced in the oligomer component via solvent-assisted process using acetone, which was recovered after completion of the process. Results indicate that the GO-doped oligomers produce cured coatings with improved anti-scratch resistance (above the resistance of conventional coatings), without surface defects and high transparency. The anti-scratch resistance was measured with atomic force microscopy (AFM). Additionally, results are presented in terms of Wolf–Wilburn scale, a straightforward method widely accepted and employed in the coating industry.

Fabrication of Polyurethane/Laponite/Graphene Transparent Coatings with High Surface Hardness

“…rGO remains negatively charged due to its surface's remaining oxygen-containing functional groups [44]. There is electrostatic repulsion between the surface of the Laponite and the GO, and electrostatic attraction between the edges of the two, which allows the Laponite to intercalate between the graphene sheets, preventing the re-accumulation or agglomeration of the graphene [45]. GO, Laponite, Lap-GO, polyurethane (PURE), and 0.05Lap-GO were characterized by infrared, and the results are shown in Figure 10b.…”

“…The spectrum (T i (λ)), after testing with a UV-visible spectrophotometer, is integrated to obtain the parameter (T i ), which can be used to determine the relative transmittance (T r i ) of the composite coating to the transmittance (T 0 ) of the coating without Lap-GO powder [45].…”

UV-Vis Activated Cu2O/SnO2/WO3 Heterostructure for Photocatalytic Removal of Pesticides

“…The presence of sulfur compounds as part of heterostructure matrices, such as SnS 2 /ZnInS 4 [ 28 ], CoTiO 3 /ZnCdS 2 [ 29 ], CdS/CeO 2 [ 30 ], CoWO 4 /CoS [ 31 ], and ZnCdS 2 /MoS [ 32 ], extend the light absorbance spectrum without solving the chemical stability issues in acid or alkaline environments. Composite materials based on g-C 3 N 4 [ 33 ], g-C 4 N 6 [ 34 ], and r-GO [ 35 ] exhibit high surface-active materials able to efficiently eliminate the pollutants using both absorption and photocatalytic processes.…”

Variable Angle Spectroscopic Ellipsometry Characterization of Reduced Graphene Oxide Stabilized with Poly(Sodium 4-Styrenesulfonate)

“…GO [5] and RGO have been used in several applications such as the electrochemical properties [6] and anti-corrosion properties [7,8] enhancement, oligonucleotide detection [9], improvement of chitosan-gelatin biocomposite films [10] and Urethane-Acrylate Transparent Coatings [11], Molecular Dynamics Simulations of DNA Adsorption [12].…”