Effects of Air Relative Humidity and Temperature on Photodegradation Processes in Beech and Spruce Wood

Tolvaj, László; Popescu, Constantin; Molnár, Zsolt; Preklet, Edina

doi:10.15376/biores.11.1.296-305

Cited by 26 publications

(17 citation statements)

References 31 publications

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“…Fourier transform infrared spectroscopy (FT-IR) is a fast, simple and sensitive method for the structural characterisation of many different materials, including wood. It has already been used for qualitative and quantitative evaluation of main wood components [23] or to study chemical and structural changes in wood polymers during biodegradation and weathering [24][25][26]. As the method requires only a small amount of the studied material, the technique proved to be useful for research on historical wooden objects.…”

Section: Introductionmentioning

confidence: 99%

Interactions between Different Organosilicons and Archaeological Waterlogged Wood Evaluated by Infrared Spectroscopy

Popescu

Broda

2021

Forests

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The goal of the study was to characterise chemical interactions between waterlogged archaeological wood and organosilicon compounds applied for its conservation to shed lights on the mechanism of wood dimensional stabilisation by the chemicals. Two alkoxysilanes (methyltrimethoxysilane and (3-mercaptopropyl) trimethoxysilane) and a siloxane (1,3-bis(diethylamino)-3-propoxypropanol)-1,1,3,3-tetramethyldisiloxane) were selected for the research since they already have been proven to effectively stabilise waterlogged wood upon drying. Fourier transform infrared spectroscopy was used for structural characterisation of the degraded wood and evaluation of reactivity of the applied chemicals with polymers in the wooden cell wall. The results obtained clearly show much stronger interactions in the case of alkoxysilanes than the siloxane, suggesting a different mechanism of wood stabilisation by these compounds. The results of this study together with other data obtained in our previous research on stabilisation of waterlogged archaeological wood with organosilicon compounds allow the conclusion that the mechanism of waterlogged wood stabilisation by the used alkoxysilanes is based on bulking the cell wall by silane molecules and wood chemical modification, while in the case of the applied siloxane, it builds upon filling the cell lumina.

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Section: Introductionmentioning

confidence: 99%

Interactions between Different Organosilicons and Archaeological Waterlogged Wood Evaluated by Infrared Spectroscopy

Popescu

Broda

2021

Forests

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“…On the other hand, extractives are of great importance in wood technology; they can affect the successful implantation of hydrothermal wood processing (e.g., wood drying), which is necessary in the production of finished wood products. It has been suggested that extractives, especially polyphenols among others, participate in the colour changes of wood during tree growth (Vek et al 2014(Vek et al , 2015 or wood processing (Burtin et al 1998;Kreber et al 1998;Pervan et al 2006;Esteves et al 2008;Straže et al 2008;SandovalTorres et al 2010;Chen et al 2014;Tolvaj et al 2016). Sundqvist and Morén (2002) concluded that the degradation products of wood polymers and extractives participate in wood colour formation during hydrothermal processing.…”

Section: Introductionmentioning

confidence: 99%

Yield of Stirred Cold Maceration and Extraction of Milled European Black Alder Wood and Bark using Different Solvents

Klarić¹,

Oven²,

Gorišek³

et al. 2016

BioResources

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a Wood extractives, especially polyphenols, have great influence on the xylem colour of many wood species, which affects the success of hydrothermal wood processing, such as wood drying. One such wood species is European black alder (Alnus glutinosa (L.) Gaertn.), which is prone to forming intense and uneven reddish-orange or reddish-brown discolourations immediately upon harvesting and processing. However, there is lack of published scientific data on the wood and bark extractives of black alder, as well as the most suitable solvents to extract them. In this work, total soluble extractives, phenols, and flavonoids have been quantified in the wood and bark of black alder. Furthermore, the influence of four different polar organic solvents and deionized water on extractives removal yields has been measured. It was found that the bark has much higher levels of extractives as compared to the wood. Furthermore, it has been found that the highest extractive yields were obtained by using methanol as the extraction solvent for all observed compound group classifications.

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“…Compared to the above results ( Figure 4 , Figure 5 , Figure 6 and Figure 7 ) and the test methodology used, the effect of colour changes tends to be emphasized by the higher moisture of the underlying wood species and higher temperature [ 83 ]. Adversely, prolonged test times do not lead to significantly higher colour changes in wood compared to the initial stages of photodegradation [ 5 , 54 , 55 ].…”

Section: Resultsmentioning

confidence: 99%

Colour Stabilization of Oak, Spruce, Larch and Douglas Fir Heartwood Treated with Mixtures of Nanoparticle Dispersions and UV-Stabilizers after Exposure to UV and VIS-Radiation

et al. 2018

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Colour changes and associated wood degradation in exterior and interior applications influenced by ultraviolet (UV) and visible radiation (VIS) decreases the aesthetic value of the products and shortens the overall life of transparent coatings. The aim of the paper is to achieve colour stabilization of oak, larch, Douglas fir and spruce heartwood via surface treatment with UV stabilizers, hindered amine light stabilizers (HALS), nanoparticles TiO2, ZnO, and mixtures thereof, during exposure to UV and VIS radiation. Colour changes were evaluated during accelerated artificial ageing testing in Xenotest. The distinctly individual character of colour changes in surface treatments due to the underlying wood species was confirmed. A synergistic effect was found when using a combination of active substances compared to substances used individually. The mixture of benzotriazoles with HALS (Tinuvin 5151) in combination with TiO2 and ZnO nanoparticles was confirmed as one of the most effective treatments for colour stabilization of wood due to UV and VIS spectrums.

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Effects of Air Relative Humidity and Temperature on Photodegradation Processes in Beech and Spruce Wood

Cited by 26 publications

References 31 publications

Interactions between Different Organosilicons and Archaeological Waterlogged Wood Evaluated by Infrared Spectroscopy

Interactions between Different Organosilicons and Archaeological Waterlogged Wood Evaluated by Infrared Spectroscopy

Yield of Stirred Cold Maceration and Extraction of Milled European Black Alder Wood and Bark using Different Solvents

Colour Stabilization of Oak, Spruce, Larch and Douglas Fir Heartwood Treated with Mixtures of Nanoparticle Dispersions and UV-Stabilizers after Exposure to UV and VIS-Radiation

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