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.
Highlights
Over the last few years, technical procedures have been developed to improve coating manufacture processes
graphene oxide (GO) is the precursor of the graphene derivatives used as nanofillers in this work: pristine as received GO, reduced GO, GO functionalized with vinyltriethoxysilane (VTES) (GOvtes) and GO functionalized with VTES and subsequently chemically reduced
In the case of chemically reduced GO using hydrazine, the increase in anti-scratch resistance was mainly attributed to the incorporation of nitrogen groups that had an active role during curing resulting in improved filler/matrix interactions
Summary
Over the last few years, technical procedures have been developed to improve coating manufacture processes. In this sense, the use of ultraviolet (UV) light-cured resins is an alternative to conventional solvent-based resins. UV light excites the photoinitiator and radicals are formed. These radicals initiate the polymerization process leading to the formation of a cross-linked solid coating. Some of the most interesting UV-curable coatings are based on urethane-acrylate resins, which show both high resistance to degradation and high mechanical performance [3,4]. Dashtizadeh et al [7] prepared coatings with acrylic resin doped with nanosilica; they observed that the addition of 15 wt.% of nanosilica
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