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Article

Photodegradation of Unmodified and Thermally Modified Wood Due to Indoor Lighting

1
Latvian State Institute of Wood Chemistry, Dzerbenes 27, LV-1006 Riga, Latvia
2
Faculty of Material Scuience and Applied Chemistry, Riga Technical University, Paula Valdena 3, LV-1048 Riga, Latvia
*
Author to whom correspondence should be addressed.
Academic Editors: Carmen-Mihaela Popescu and Holger Militz
Forests 2021, 12(8), 1060; https://doi.org/10.3390/f12081060
Received: 28 June 2021 / Revised: 2 August 2021 / Accepted: 3 August 2021 / Published: 9 August 2021
(This article belongs to the Special Issue Thermal Modification of Wood: Process and Properties)
Considering interior applications, sunlight, both direct through open window and through window glass, and artificial lighting are the main sources of radiation possessing sufficient energy to trigger photodegradation processes in wood. LED lamps, which emit mostly visible light, are becoming the dominant artificial light source in various interiors. In the present study, photodegradation of thermally modified (TM) and unmodified (UM) ash (Fraxinus excelsior), aspen (Populus tremula), and pine (Pinus sylvestris) due to exposure to UV radiation and LED lamps was evaluated and compared by analysing wood discolouration (CIELAB colour space), changes in reflectance and FTIR spectra, and formation of water-soluble components. The results show that, apart from UV radiation, LED lamps may cause considerable photodegradation of both TM and UM wood resulting in visually perceptible colour change, alteration in chemical structure and formation of water-soluble components. Improved photo-stability was observed for TM wood exposed to UV radiation, while even more changes in FTIR spectra were detected for TM than UM wood in the experiment with LED lamps. Comparing TM and UM wood, the changes due to photodegradation were quite similar for TM wood of all species while significant differences were observed in the case of UM wood. View Full-Text
Keywords: wood discolouration; wood photodegradation; thermally modified wood; UV; LED wood discolouration; wood photodegradation; thermally modified wood; UV; LED
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MDPI and ACS Style

Cirule, D.; Kuka, E.; Kevers, M.; Andersone, I.; Andersons, B. Photodegradation of Unmodified and Thermally Modified Wood Due to Indoor Lighting. Forests 2021, 12, 1060. https://doi.org/10.3390/f12081060

AMA Style

Cirule D, Kuka E, Kevers M, Andersone I, Andersons B. Photodegradation of Unmodified and Thermally Modified Wood Due to Indoor Lighting. Forests. 2021; 12(8):1060. https://doi.org/10.3390/f12081060

Chicago/Turabian Style

Cirule, Dace, Edgars Kuka, Matiss Kevers, Ingeborga Andersone, and Bruno Andersons. 2021. "Photodegradation of Unmodified and Thermally Modified Wood Due to Indoor Lighting" Forests 12, no. 8: 1060. https://doi.org/10.3390/f12081060

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