Surface Changes on Acetylation and Exposure to Ultraviolet Radiation of <i>Pinus radiata </i>Using X-Ray Photo-Electron Spectroscopy

Torr, Kirk M.; Dawson, Bernard S. W.; Ede, Richard M.; Singh, Jagriti

doi:10.1515/hfsg.1996.50.5.449

Cited by 20 publications

(8 citation statements)

References 13 publications

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“…However, acetylated wood only shows initial stability against UV radiation; later, it begins to fade and grey (Kalnins 1984, Hon 1995, Torr et al 1996, Ota et al 1996, 1997, Ohkoshi 2002, Mitsui -Tolvaj 2004, 2005. This is also true for Accoya® Radiata pine (Meyer 2006, Lahtela -Kärki 2015.…”

Section: Introductionmentioning

confidence: 97%

Testing the Photostability of Acetylated and Boiled Linseed Oil-coated Common Hornbeam (Carpinus betulus L.) Wood

Fodor¹,

Németh²

2017

Acta Silvatica Et Lignaria Hungarica

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-In this study, the effect of acetylation and coating with boiled linseed oil was evaluated concerning the photodegradation of common hornbeam wood (Carpinus betulus L.). To measure colour stability, a 10-month-long outdoor weather resistance test without soil contact was performed as well as artificial aging using a 200 hour mercury-vapour lamp irradiation test. The measurements were done on hornbeam, acetylated hornbeam, boiled linseed oil-treated hornbeam, and acetylated and boiled linseed oil-treated hornbeam samples. The control and treated samples' colour change was determined by comparing them to the original colour in all cases. The photodegradation process was examined with Fourier Transform Infrared (FTIR) spectra. Acetylated hornbeam was less prone to crack, but the modification did not hinder the fading and greying caused by UV irradiation. Coating the samples with boiled linseed oil decreased the rate of colour change and cracking. The photodegradation of lignin was confirmed by the FTIR spectra.

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Section: Introductionmentioning

confidence: 97%

Testing the Photostability of Acetylated and Boiled Linseed Oil-coated Common Hornbeam (Carpinus betulus L.) Wood

Fodor¹,

Németh²

2017

Acta Silvatica Et Lignaria Hungarica

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“…Depolymerisation of cellulose and erosion of the middle lamella still takes place after acetylation, but mass loss is reduced and latewood cells maintain their structure [ 155 ]. It has been established that acetylation is ineffective in protecting lignin at wood surfaces during accelerated weathering [ 149 , 155 , 168 , 169 ], although some photoprotective effects of acetylation to 20% weight gain have been reported on holocellulose and on the morphology of wood cell walls [ 155 , 170 , 171 ]. However, acetylation is also reported to inhibit discolouration during UV exposure through a reduction of the formation of coloured chromophores on the wood surface [ 152 , 153 ].…”

Section: Chemical Modification Of Woodmentioning

confidence: 99%

Enhancing Weathering Resistance of Wood—A Review

Jirouš-Rajković

Miklečić

2021

Polymers

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Wood is a truly sustainable and aesthetically pleasant material used in indoor and outdoor applications. Every material, including wood, is expected to have long-term durability and to retain its original appearance over time. One of the major disadvantages of wood is the deterioration of its surface when exposed outdoors, known as weathering. Although weathering is primarily a surface phenomenon, it is an important issue for wood products as it affects their appearance, service life, and wood-coating performance. To encourage the use of wood as a material for joinery and other building components, the results of research into increasing the weathering resistance of wood are extremely significant. The development of weathering protection methods is of great importance to reduce the maintenance requirements for wood exposed outdoors and can have a major environmental impact. There are various methods of protecting wood surfaces against weathering. This paper provides a literature survey on the recent research results in protecting wood from weathering. The topics covered include surface treatments of wood with photostabilizers; protection with coatings; the deposition of thin film onto wood surfaces; treatments of wood with inorganic metal compounds and bio-based water repellents; the chemical modification of wood; the modification of wood and wood surfaces with thermosetting resins, furfuryl alcohol, and DMDHEU; and the thermal modification of wood.

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“…They found that the O/C atom ratio increases and significant changes are apparent in the Cls spectra but not in the Ols spectra. The XPS spectra of irradiated wood and lignin showed that photo-oxidation had occurred in both extracted wood, untreated lignin, and acetylated samples [107]. UV weathering performance of polyvinyl chloride (PVC) containing different concentrations of wood powder was studied by Matuana and Kamdem (2002) based on the assessment of XPS data and other test results.…”

Section: Chemical Changes During Weatheringmentioning

confidence: 99%

Study on the degradation mechanism of heat-treated wood by UV light /

Huang

2012

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Heat-treated wood is a wood product thermally treated at high temperatures in the range of 180°C and 240°C for its preservation without using any additional chemicals. Heat treatment modifies wood both chemically and physically. Amorphous polysaccharide content (hemicelluloses) decreases, condensation and demethoxylation of lignin take place, and certain extractives are removed. Consequently, heat-treated wood possesses new physical properties such as reduced hygroscopy, improved dimensional stability, better resistance to degradation by insects and micro-organisms, and attractive darker color. These new beneficial and attractive properties make heat-treated wood popular for indoor as well as outdoor applications.However, similar to untreated wood, heat-treated wood is also susceptible to degradation due to environmental conditions. Weathering results in poor aesthetics for heat-treated wood because of the discoloration and surface checking when exposed to UV radiation. However, investigations on the wettability changes, chemical changes, and microscopic changes of heat-treated wood after exposure to artificial weathering are very limited; and there is no publication available in the literature on the degradation taking place due to the weathering of heat-treated North American jack pine, aspen, and birch used in this study.This work was undertaken to study the weathering degradation mechanisms of the three North American regional species (jack pine (Pinus banksiana), aspen (Populus tremuloides\ and birch (Betula papyrifera)) heat-treated under different conditions to understand the chemical and physical changes taking place and to compare these changes with those of untreated controlled samples when they are exposed to artificial weathering with and without water spray for various periods. Several techniques and tools were used such as color measurement, contact angle test for wettability analysis, Fourier transforms infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) for chemical analysis, florescence microscopy (FM), and scanning electron spectroscopy (SEM) for microscopic structural analysis. These provide a great deal of insight into the degradation process.The results show that color changes occurring during weathering of heat-treated woods are due to the increasing lignin condensation and decreasing extractives content on wood surfaces caused by heat treatment. Changes in wettability during weathering of heattreated wood are induced by the combination of surface structural and chemical modifications. Lignin in heat-treated woods is more sensitive to weathering than other components. It is proposed that the weathering mechanism of heat-treated woods consists of the degradation of lignin matrix and extractives, which lightens the wood color. As a result, the color difference between the color of heat-treated wood before weathering and the color of the same wood during weathering increases with exposure time. Then, the leaching of other polymers present on wood surface takes place...

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Surface Changes on Acetylation and Exposure to Ultraviolet Radiation of Pinus radiata Using X-Ray Photo-Electron Spectroscopy

Cited by 20 publications

References 13 publications

Testing the Photostability of Acetylated and Boiled Linseed Oil-coated Common Hornbeam (Carpinus betulus L.) Wood

Testing the Photostability of Acetylated and Boiled Linseed Oil-coated Common Hornbeam (Carpinus betulus L.) Wood

Enhancing Weathering Resistance of Wood—A Review

Study on the degradation mechanism of heat-treated wood by UV light /

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