Kúdela, Jozef, 1954- Influence of accelerated ageing on morphology and wetting of wood surface treated with a modified water-based coating system / Jozef Kúdela, Martina Štrbová, František Jaš. -- obr., tab. -- Lit. - This work evaluates accelerated ageing effects on quality of tree-of-heaven wood surface finished with a water-based coating system applied in several colour hues. This coating system has been adjusted for surface treatment intended for outdoor exposure. There were studied morphological changes in surface of treated wood at accelerated ageing, through its roughness parameters. There was also investigated the resistance of this wood against wetting with liquids and surface free energy with its components. The results show that the dry accelerated ageing mode did not cause significant changes in roughness and waviness. The wet mode induced moderate increase in roughness, enhancing, in such a way, variability in roughness and waviness. In all cases, the higher roughness and waviness values were recorded perpendicular to the grain. This gives evidence that the surface treatment had not resulted in total smoothing the wood anisotropy. The experimental results related to wetting with specific liquids also confirmed high water-resistance of the tested coating system. The contact angles occurring during wetting with water exceeded 90°. This ensured effective protection for wood surface against water during ageing, and the overall stability of the system wood solid-coating. The average surface free energy values of specimens surface-treated with the tested coating system determined based on wood wetting with water and diiodomethane were comparatively low (about 26 mJm-2), with dominant apolar component. The dry mode did not induce significant response in surface free energy. The wet (rainfall simulation) mode resulted in a moderate increase in surface free energy (to about 34 mJm-2), mostly due to the increase in the polar component. The colour hue of the coating system had no effects on the investigated characteristics.

In Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Zvolen : Technická univerzita vo Zvolene, 2017. -- ISSN 1336-3824. -- Roč. 59, č. 1 (2017), s. 27-39

I. Štrbová, Martina, 1986-
II. Jaš, František
III. Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Roč. 59, č. 1 (2017), s. 27-39

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