Journal
PROGRESS IN ORGANIC COATINGS
Volume 103, Issue -, Pages 60-68Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2016.11.022
Keywords
Zirconium oxide; Nanocomposite; Nanoparticles; Non hydrolytic sol-gel; Anti-scratch coatings; Transparency; Coatings
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Hybrid transparent coatings based on zirconia nanoparticle fillers and epoxy resin were designed to increase scratch resistance of commodity polymers without impairing their optical properties. Suspensions of nano-crystalline ZrO2 in benzyl alcohol were synthesized via a versatile non-hydrolytic sol-gel process using ZrCl4 as precursor. The obtained ZrO2 nanoparticles showed a crystalline structure attributable to a tetragonal phase and an average particle size of 2 nm. ZrO2 nanoparticles, suspended in tert-butanol, were mixed with a commercial epoxy resin (5 and 10%wt.). The organic solvent was then evaporated and hybrid composites were deposited on polycarbonate and poly(methyl methacrylate). The obtained coatings showed a homogeneous adhesion and a negligible effect on the transparency of these polymers. An increased scratch-resistance was obtained by increasing the ZrO2 nanoparticles content. (C) 2016 Elsevier B.V. All rights reserved.
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