Photochemical degradation of acetylated, methylated, phenylhydrazine-modified, and ACC-treated wood

Kalniņš, Mārtiņš

doi:10.1002/app.1984.070290111

Cited by 28 publications

(11 citation statements)

References 4 publications

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“…Plackett et al (1992) reported reduced colour change and surface checking of acetylated Pinus radiata on accelerated weathering. Kalnins (1984), however, found that irradiation of acetylated redwood produced increased quantities of carbon dioxide, carbon monoxide, methanol and formaldehyde compared with untreated wood. Kalnins concluded that acetyl groups were resistant to photodegradation but that acetylation made the rest of the wood more susceptible to photodegradation.…”

Section: Introductionmentioning

confidence: 91%

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

Torr¹,

Dawson²,

Ede³

et al. 1996

HFSG

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Various Pinus radiata wood components, solvent extracted and acetylated, were irradiated with ultraviolet light (λ, η ηχ = 350ηιτι). The XPS spectrum of the acetylated wood surface resembled that of cellulose acetate suggesting that acetylation removes lignin from the wood surface. The presence of acelylaled lignin in the acetic anhydride solution following acetylation, identified by IR and NMR, supports this theory. This could be a major contributor to the bleaching of wood on acetylation. The XPS spectra of irradiated wood and lignin showed that photo-oxidation had occurred in both extracted wood, untreated lignin and acetylated samples. DemcthoxyJation and/or -aryl ether cleavage in untreated irradiated lignin is supported by the XPS spectra while deacetylation of irradiated acetylated samples is indicated by decreased Ci band intensity. Acetylation proved ineffective in preventing photo-oxidation of wooden surfaces. The depletion of lignin on the wooden surface, (an artefact of acetylation) results in less light absorption thereby retarding photo-induced yellowing. Peroxide treatment of extracted radiata pine did not deplete surface lignin.

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Section: Introductionmentioning

confidence: 91%

“…Kalnins (1984) reported that irradiation of acetylated redwood produced increased quantities of volatile products such as carbon dioxide, carbon monoxide, formaldehyde and methanol compared with extracted wood. He also reported, however, that the acetyl groups themselves were resistant to photodegradation.…”

Section: (Is) Peak Areasmentioning

confidence: 99%

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

Torr¹,

Dawson²,

Ede³

et al. 1996

HFSG

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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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“…Subsequently, photoyellowing of the wood surfaces occurs, and lignin degradation leads to the loss of integrity of the wood surface structure. However, photooxi-dation of acetylated wood had also been observed (Feist et al 1991;Kalnins 1984;Kiguchi 1997;Chang and Chang 1999). Chemical modification has been used to protect wood from environmental degradation (Kumar 1994).…”

Section: Introductionmentioning

confidence: 98%

Inhibition of the Photodiscoloration of Wood by Butyrylation

Chang¹,

Chang²

2001

Holzforschung

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The lightfastness of butyrylated China fir (Cunninghamia lanceolata var. lanceolata) and maple (Acer sp.) was evaluated in this study, and its effectiveness was compared with that of acetylated specimens. The color fading in acetylated China fir and maple woods was reduced to half that of untreated specimens, after a 24-day UV lightfastness test. The effectiveness of butyrylation on photodiscoloration prevention in wood was even more pronounced than that with acetylation. With an 18.57 % weight percent gain, butyrylation remarkably inhibited the discoloration of wood following UV irradiation. Based on infrared spectral analysis, the lignin of both untreated and butyrylated woods deteriorated after exposure to UV light, but the holocellulose in butyrylated wood was more resistant to the UV light. Furthermore, results obtained from diffuse reflectance UV-VIS spectral analysis elucidated that the absorption of irradiated butyrylated wood, in comparison with that of the irradiated but untreated specimens, was lower in both UV light and visible light regions. It also revealed that the inhibition of photodiscoloration of wood by butyrylation was caused mainly by a significant reduction of chromophoric derivatives, such as quinoid compounds, formed on the wood surface. KeywordsWood Cunninghamia lanceolata Photoyellowing Discoloration Acetylation Butyrylation Lightfastness Brought to you by | University of Queensland -UQ Library Authenticated Download Date | 6/22/15 2:05 AM

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Photochemical degradation of acetylated, methylated, phenylhydrazine-modified, and ACC-treated wood

Cited by 28 publications

References 4 publications

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

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

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

Inhibition of the Photodiscoloration of Wood by Butyrylation

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