Spectral sensitivity in the photodegradation of fir wood (Abies alba Mill.) surfaces: colour changes in natural weathering

Živković, Vjekoslav; Arnold, Martin; Radmanović, Kristijan; Richter, Klaus; Turkulin, Hrvoje

doi:10.1007/s00226-013-0601-4

Cited by 46 publications

(26 citation statements)

References 23 publications

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“…Colour changes of wood samples Concerning the L*a*b* changes as a function of irradiation time, lightness (L*) clearly decreases in normal wood varying from 82.06 to 68.99 after 504 h of exposure as also observed for other species (Lo Monaco et al 2011b;Pelosi et al 2013;Calienno et al 2014;Deka et al 2008;Esteves et al 2008;Ferreira et al 2012;Oltean et al 2008;Sharratt et al 2009;Ž ivković et al 2014). The rapid decrease in lightness observed for the normal wood within the first 48 h of exposure can be ascribed to photodegradation processes.…”

Section: Resultsmentioning

confidence: 68%

Colour and chemical changes on photodegraded beech wood with or without red heartwood

et al. 2014

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The focus of this study was to investigate the chemical and colour changes occurring at different exposure times on artificially photo-irradiated surfaces of normal and red heartwood in beech in order to understand the mechanisms that cause the changes and to evaluate the possibility of usages of beech not only for energy production purposes. In this sense, surface colour modifications are of crucial importance to define the commercial value of beech wood. The artificial photo-irradiation of the wood samples was performed in a Solar Box, equipped with an ultraviolet filter that cuts off the spectrum at 280 nm. Reflectance spectrophotometry and Fourier transform infrared (FTIR) spectroscopy were used to assess artificial sunlight influence. The experimental data were statistically treated to evaluate their significance. Colour monitoring revealed that wood surface colour undergoes an important variation due to photo-irradiation, occurring within the first 24-48 h. Moreover, it was found that the chromatic coordinates (L*a*b*) in normal wood and in red heartwood tended to similar values after 504 h. FTIR spectroscopy allowed for investigating the rate of photodegradation of wood surface due to oxidation reactions of wood components. The results were validated by statistical analysis applied both to the colorimetric and spectroscopic data.

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Section: Resultsmentioning

confidence: 68%

Colour and chemical changes on photodegraded beech wood with or without red heartwood

et al. 2014

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“…The colour change caused by the sunshine and the rain for natural wood is a well investigated phenomenon [12][13][14][15][16][17][18][19]. But the colour change caused by the photodegradation for thermally treated wood is not well researched, and the published results are sometimes contradictory.…”

Section: Introductionmentioning

confidence: 99%

Colour stability of oil-heat treated black locust and poplar wood during short-term UV radiation

Németh

Tolvaj

Bak

et al. 2016

Journal of Photochemistry and Photobiology A: Chemistry

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A B S T R A C TBlack locust (Robinia pseudoacacia L) samples with high extractive content and poplar (Populus Â euramericana cv. Pannónia) samples with low extractive content were chosen for the test. The specimens were thermally treated at 160 and 200 C in sunflower oil for 2, 4, and 6 h then irradiated by a strong UV emitter mercury lamp up to 36 h. The effects of thermal treatment and UV radiation were monitored by colour measurement. The results indicated that the extractives play an important role in the photodegradation of oil-heat treated wood. Thermal treatments reduced the lightness change effect of photodegradation. The oil-heat treated black locust samples showed similar photodegradation properties independently on the thermal pre-treatment time and temperature. The redness of oilheat treated black locust samples hardly changed during UV radiation proving the photostability of the thermally modified extractives. The redness change of poplar samples caused by UV radiation was partly determined by the temperature of thermal treatment (darkening and lightening also happened). The yellow colour change of the investigated samples showed that the lignin of thermally modified wood undergoes similar photodegradation as that of the untreated natural wood.

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“…The main degradative factors are sunshine and rain. This phenomenon of photodegradation has been well studied for natural wood (Pandey 2005;Sharratt et al 2009;Chang et al 2010;Popescu et al 2011;Persze and Tolvaj 2012;Agresti et al 2013;Denes and Lang 2013;Teaca et al 2013;Zivkovic et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Colour Stability of Thermally Modified Wood during Short-Term Photodegradation

Tolvaj¹,

Németh²,

Pásztory³

et al. 2014

BioResources

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Dry thermal treatments of wood samples were carried out at 160 and 200 °C. After each treatment, the samples were irradiated using a strong UV emitter mercury lamp, and the colour change was then evaluated. For control, untreated samples were also irradiated using the same mercury lamp. Results showed that the extractive content of the wood played an important role in the colour change not only during thermal treatment but also during light irradiation. It was found that, compared to the thermally untreated samples, the thermal treatment at 200 °C reduced the red colour change due to photodegradation. The yellow colour change of photodegradation was hardly affected by the applied thermal treatments, showing that thermal treatments were not able to reduce the light degradation of lignin. The applied treatments slightly stabilized the wood against the degrading effect of light. The wood treated at lower temperature (160 °C) had less colour change induced by the light source.

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Spectral sensitivity in the photodegradation of fir wood (Abies alba Mill.) surfaces: colour changes in natural weathering

Cited by 46 publications

References 23 publications

Colour and chemical changes on photodegraded beech wood with or without red heartwood

Colour and chemical changes on photodegraded beech wood with or without red heartwood

Colour stability of oil-heat treated black locust and poplar wood during short-term UV radiation

Colour Stability of Thermally Modified Wood during Short-Term Photodegradation

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