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Durability of the Exterior Transparent Coatings on Nano-Photostabilized English Oak Wood and Possibility of Its Prediction before Artificial Accelerated Weathering

Department of Wood Processing and Biomaterials, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences in Prague, Kamýcká 129, 165 00 Prague, Czech Republic
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Nanomaterials 2019, 9(11), 1568; https://doi.org/10.3390/nano9111568
Received: 24 October 2019 / Revised: 24 October 2019 / Accepted: 1 November 2019 / Published: 5 November 2019
Changes in surface material characteristics can significantly affect the adhesion and overall life of coatings on wood. In order to increase the durability of transparent exterior coatings, it is possible to use the surface modification of wood with UV-stabilizing substances. In this work, selected types of surface modifications using benzotriazoles, HALS, ZnO and TiO2 nanoparticles, and their combinations were applied to oak wood (Quercus robur, L.). On such modified surfaces, the surface free energy, roughness, and contact wetting angle with three selected types of exterior transparent coatings were subsequently determined. An oil-based coating, waterborne acrylic thick layer coating, and thin-layer synthetic coating were tested and interaction with the aforementioned surface modifications was investigated after 6 weeks of accelerated artificial weathering. The results of changes in the initially measured surface characteristics of the modified oak wood were compared to the real results of degradation of coatings after artificial accelerated weathering. The positive effect of surface modification, in particular the mixture of benzotriazoles, HALS, and ZnO nanoparticles on all kinds of coatings was proven, and the best results were observed in thick-film waterborne acrylic coating. The changes in the measured surface characteristics corresponded to the observed durability of the coatings only when measured by wetting using drops of the tested coatings.
Keywords: oak wood; surface modification; UV-stabilization; nanoparticles; contact angle; surface free energy; exterior transparent coatings; durability oak wood; surface modification; UV-stabilization; nanoparticles; contact angle; surface free energy; exterior transparent coatings; durability
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Pánek, M.; Hýsek, Š.; Dvořák, O.; Zeidler, A.; Oberhofnerová, E.; Šimůnková, K.; Šedivka, P. Durability of the Exterior Transparent Coatings on Nano-Photostabilized English Oak Wood and Possibility of Its Prediction before Artificial Accelerated Weathering. Nanomaterials 2019, 9, 1568.

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