A new approach for the modelling of chestnut wood photo-degradation monitored by different spectroscopic techniques

Bonifazi, Giuseppe; Calienno, Luca; Capobianco, Giuseppe; Monaco, Angela Lo; Pelosi, Claudia; Picchio, Rodolfo; Serranti, Silvia

doi:10.1007/s11356-016-6047-0

Cited by 21 publications

(9 citation statements)

References 33 publications

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“…The statistically significant effect of pretreatment on the color parameters L*, a*, and b* was observed after AA (p < 0.05). The increase of values a* and b* showing a tendency for the wood surface to turn reddish and yellowish during AA and the decrease of L* (negative value) indicating a tendency to turn into darker color, was also observed in other studies [39][40][41]. The darkening could be directly influenced by UV absorber properties that may…”

Section: Color Parameters L* A* B* During Aasupporting

confidence: 76%

Color Stabilization of Siberian and European Larch Wood Using UVA, HALS, and Nanoparticle Pretreatments

Oberhofnerová

Pánek

Podlena

et al. 2019

Forests

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Reducing discoloration of wood due to photodegradation caused by ultraviolet (UV) and visible (VIS) radiation enhances its aesthetical value and prolongs the overall service life of protective coatings. In this study, the efficiency of pretreatments with different active ingredients to reduce degradation and stabilize the color of Siberian (Larix sibirica Ledeb.) and European larch (Larix decidua Mill) wood was investigated. UV absorbers (UVA), hindered amine light stabilizers (HALS) and zinc oxide nanoparticles were used in twenty different pretreatments. The ability to protect wood surface against radiation was evaluated via color and gloss change measurements during artificial ageing. The efficiency of tested color-stabilizing pretreatments differed for Siberian and European larch and not all of them reduced discoloration. The most effective pretreatments were based on a combination of UVA and HALS in a synergistic effect. Overall, the best efficiency from tested variants for larch wood generally was observed for combination of Eversorb 80 on benzotriazole basis + Eversorb 93 on a piperidinyl basis. The pretreatments did not significantly affect the gloss values. The results revealed convenient variants of stabilizers for Siberian and European larch wood and confirmed different compatibility between specific wood species and color stabilizers.

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Section: Color Parameters L* A* B* During Aasupporting

confidence: 76%

Color Stabilization of Siberian and European Larch Wood Using UVA, HALS, and Nanoparticle Pretreatments

Oberhofnerová

Pánek

Podlena

et al. 2019

Forests

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“…The rate of yellowing was shown to be well correlated with changes due to oxidation as visualised by infra-red and novel hyperspectral imaging for photodegradation of chestnut wood under simulated solar UV radiation. 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 Mosupporting

confidence: 70%

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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“…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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A new approach for the modelling of chestnut wood photo-degradation monitored by different spectroscopic techniques

Cited by 21 publications

References 33 publications

Color Stabilization of Siberian and European Larch Wood Using UVA, HALS, and Nanoparticle Pretreatments

Color Stabilization of Siberian and European Larch Wood Using UVA, HALS, and Nanoparticle Pretreatments

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

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

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