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Forests 2018, 9(9), 557; https://doi.org/10.3390/f9090557

Surface Changes of Selected Hardwoods Due to Weather Conditions

1
Faculty of Wood Sciences and Technology, Technical University in Zvolen, T.G. Masaryka 24, 960 53 Zvolen, Slovakia
2
Faculty of Forestry and Wood Sciences, Czech University of Life Sciences in Prague, Kamýcká 129, 16521 Praha 6-Suchdol, Czech Republic
*
Author to whom correspondence should be addressed.
Received: 14 August 2018 / Revised: 6 September 2018 / Accepted: 7 September 2018 / Published: 11 September 2018
(This article belongs to the Special Issue Wood Properties and Processing)
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Abstract

The study is focused on the surface changes of five hardwoods (oak, black locust, poplar, alder and maple) that were exposed to natural weathering for 24 months in the climatic conditions of Central Europe. Colour, roughness, visual and chemical changes of exposed surface structures were examined. The lowest total colour changes (ΔE*) were found for oak (23.77), the highest being recorded for maple (34.19). Roughness differences after 24-month exposure (ΔRa) showed minimal changes in poplar wood (9.41); the highest changes in roughness were found on the surface of alder (22.18). The presence of mould and blue stains was found on the surface of maple, alder and poplar. Chemical changes were characterized by lignin and hemicelluloses degradation. Decreases of both methoxy and carbonyl groups, cleavage of bonds in lignin and hemicelluloses, oxidation reaction and formation of new chromophores were observed. In the initial phases of the degradation process, the discoloration was related to chemical changes; in the longer period, the greying due to settling of dust particles and action of mould influenced the wood colour. The data were confirmed by confocal laser scanning microscopy. The obtained results revealed degradation processes of tested hardwood surfaces exposed to external environmental factors. View Full-Text
Keywords: chemical changes; colour changes; infrared spectroscopy; hardwoods; roughness chemical changes; colour changes; infrared spectroscopy; hardwoods; roughness
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Kubovský, I.; Oberhofnerová, E.; Kačík, F.; Pánek, M. Surface Changes of Selected Hardwoods Due to Weather Conditions. Forests 2018, 9, 557.

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