Spectral sensitivity in the photodegradation of fir wood (Abies alba Mill.) surfaces: correspondence of physical and chemical changes in natural weathering

Živković, Vjekoslav; Arnold, Martin; Pandey, Krishna K.; Richter, Klaus; Turkulin, Hrvoje

doi:10.1007/s00226-016-0834-0

Cited by 18 publications

(6 citation statements)

References 27 publications

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“…Most of the color changes were observed within first 50 h of exposure. This trend in color changes is in agreement with several other studies on color changes in light irradiated wood (Tolvaj and Faix 1995, Muller et al 2003, Pandey 2005, Pandey and Vuorinen 2008, Calienno et al 2015, Gonzalez de Cademartori et al 2015, Timar et al 2016, Zivkovic et al 2016, Oberhofnerová et al 2017.…”

Section: Color Changessupporting

confidence: 93%

Photostability of acetylated wood coated with nano zinc oxide

Nagarajappa

Nair

Srinivas

et al. 2020

Maderas, Cienc. tecnol.

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Chemical modification with acetic anhydride is an effective method to stabilise wood against dimensional movement and improve decay resistance of wood. It has also been reported to retard UV light induced color darkening on wood surface. Coatings of wood surfaces with certain nano metal oxides have also shown promise as UV screening agent. In this work, we have evaluated synergistic effect of acetylation of wood and application of nano material on wood surfaces to enhance their UV stability. Photo-stability of acetylated Wrightia tinctoria wood coated with zinc oxide (ZnO) nanodispersion was evaluated by irradiating these wood specimens to UV radiation in an accelerated weathering tester. Acetylation of wood with acetic anhydride exhibited photo-bleaching and inhibited light-induced color darkening observed in unmodified wood. Coating of unmodified and modified wood surfaces with ZnO nanodispersion reduced photo-discolouration and degradation of wood polymers. The photo-bleaching observed in chemically modified wood upon light irradiation was further enhanced by application of nano coating on wood surfaces.

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Section: Color Changessupporting

confidence: 93%

Photostability of acetylated wood coated with nano zinc oxide

Nagarajappa

Nair

Srinivas

et al. 2020

Maderas, Cienc. tecnol.

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“…The dominant factor responsible for wood degradation is lignin, which absorbs ultraviolet and visible radiation due to its chromophoric groups. However, the effect of visible light to surface degradation at later stages of weathering was observed [57][58][59]. According to Norrstrom [60], lignin is responsible for absorbing 80% to 95% of the total UV light absorbed by wood, carbohydrates 5 to 20% and extractives about 2%.…”

Section: Discussionmentioning

confidence: 99%

Surface Changes of Selected Hardwoods Due to Weather Conditions

Kubovský

Oberhofnerová

Kačík

et al. 2018

Forests

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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.

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“…Yellowing of wood 356 -358 and signatures for oxidation products in the infra-red (IR) spectra 359 , 360 are indicative of solar UV-induced oxidative degradation of wood. These changes are more pronounced during initial stages of exposure 358 -360 and are localised in a thin surface layer of wood 360 and bamboo. 361 The fractional crystallinity of cellulose in bamboo increases during photodegradation as the amorphous cellulose fraction is preferentially degraded.…”

Section: Surface Yellowing Of Wood On Exposure To Uv Radiation Is Correlated With the Extent Of Chemical Modification Allowing Simpler Momentioning

confidence: 99%

“…358 A similar correlation was also reported between the residual lignin content and tensile strength during natural weathering of fir-wood. 360 If generally applicable, such correlations allow easier, non-invasive measurements (particularly yellowness index) to be used to assess the progress of oxidative changes in the wood.…”

Section: Surface Yellowing Of Wood On Exposure To Uv Radiation Is Correlated With the Extent Of Chemical Modification Allowing Simpler Momentioning

confidence: 99%

Environmental effects of ozone depletion and its interactions with climate change: Progress report, 2016

Panel¹

2017

Photochem Photobiol Sci

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The Parties to the Montreal Protocol are informed by three Panels of experts. One of these is the Environmental Effects Assessment Panel (EEAP), which deals with two focal issues. The first focus is the effects of UV radiation on human health, animals, plants, biogeochemistry, air quality, and materials. The second focus is on interactions between UV radiation and global climate change and how these may affect humans and the environment. When considering the effects of climate change, it has become clear that processes resulting in changes in stratospheric ozone are more complex than previously believed. As a result of this, human health and environmental issues will be longer-lasting and more regionally variable. Like the other Panels, the EEAP produces a detailed report every four years; the most recent was published as a series of seven papers in 2015 (Photochem. Photobiol. Sci., 2015, 14, 1-184). In the years in between, the EEAP produces less detailed and shorter Progress Reports of the relevant scientific findings. The most recent of these was for 2015 (Photochem. Photobiol. Sci., 2016, 15, 141-147). The present Progress Report for 2016 assesses some of the highlights and new insights with regard to the interactive nature of the direct and indirect effects of UV radiation, atmospheric processes, and climate change. The more detailed Quadrennial Assessment will be made available in 2018.

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Spectral sensitivity in the photodegradation of fir wood (Abies alba Mill.) surfaces: correspondence of physical and chemical changes in natural weathering

Cited by 18 publications

References 27 publications

Photostability of acetylated wood coated with nano zinc oxide

Photostability of acetylated wood coated with nano zinc oxide

Surface Changes of Selected Hardwoods Due to Weather Conditions

Environmental effects of ozone depletion and its interactions with climate change: Progress report, 2016

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