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The behavior of thermally modified wood after exposure in maritime/industrial and urban environments
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Orientador(es)
Resumo(s)
Natural and thermally modified Pine, Ash, and Acacia woods were exposed in two different en-
vironments: urban and maritime/industrial. The weathering effects were evaluated during 24
months regarding color, chemical, and structural changes. In all wood species, thermal modifi-
cation induced color, chemical, and structural changes. All woods became darker (Pine ΔL*:
32.01; Ash ΔL*: 36.83; Acacia ΔL*: 27.50), total extractives content increased (Pine: 19 %;
Ash: 32 % and Acacia: 18 %), and the samples presented deformation and damaged cells. Total
lignin was not significantly changed, although there were detected changes in lignin, namely the
reduction of G-units in Pine (≈2 %) and reduction of S/G ratio in Acacia (≈0.04 %). Ash remained
almost the same. After weathering, modified woods suffered fewer color changes, indicating that
the thermal modification could improve the resistance to color change. Acacia wood, when
exposed to maritime/industrial conditions, revealed a higher color change (ΔE: 35.7 at 24
months) when compared with urban conditions (ΔE: 23.5 at 24 months). Delignification, possibly
caused by photodegradation, occurred in all wood samples, and the loss of extractive happened,
perhaps caused by rain. Modified woods were slightly less resistant to weathering in maritime/
industrial environments. Some structural damage, namely cracked cells, the appearance of molds,
blue staining, and particle deposition, was observed. The thermal modification enables color
stabilization but does not seem to improve the weathering resistance in all studied wood species.
Exposure to the different environments did not lead to significant differences in the morphology
and chemical composition of the three natural and modified wood species.
Descrição
Palavras-chave
wood species valorization wood modification weathering degradation pollution resistance sea breeze resistance
Contexto Educativo
Citação
Godinho, D., Ferreira, C., Lourenço, A., Araújo, S.O., Quilhó, T., Diamantino, T.C., Gominho, J. The behavior of thermally modified wood after exposure in maritime/industrial and urban environments, Heliyon, Volume 10, Issue 3, 2024, e25020, ISSN 2405-8440, https://doi.org/10.1016/j.heliyon.2024.e25020.
Editora
CellPress