FTIR and color change of the modified wood as a result of artificial light irradiation

Roşu, Dan; Teacă, Carmen‐Alice; Bodîrlău, Ruxanda; Roşu, Liliana

doi:10.1016/j.jphotobiol.2010.03.010

Cited by 151 publications

(74 citation statements)

References 18 publications

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“…Lignin is the most susceptible component to weathering degradation (Feist and Hon 1984). Furthermore, changes of wood color occur due to the action of ultraviolet irradiation and fractions of the visible spectrum of solar irradiation, both in combination with oxidative agents, temperature and moisture (Rosu et al 2010). Leaching of extractives from the surface of weathered woods reduces water repellence, while degradation of lignin results in a more hydrophilic surface (Rowell 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Scientific studies have been conducted regarding the performance of native and exotic woods exposed to artificial weathering (Baysal et al 2014, Valverde and Moya 2010, Baar and Gryc 2012, Grüll et al 2014) and natural weathering (Rosu et al 2010, Mattos et al 2013, De Windt et al 2014, Akhtari and Nicholas 2014. Thus, the investigation of woods from fast-growing species with high benefit in the market is important to improve their performance.…”

Section: Introductionmentioning

confidence: 99%

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Natural weathering performance of three fast-growing Eucalypt woods

Cademartori

Missio

Mattos

et al. 2015

Maderas, Cienc. tecnol.

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We investigated the effect of outdoor exposure on the wood surface from three fast-growing Brazilian eucalypts through color, wetting and thermal analyzes. Gympie messmate (Eucalyptus cloeziana), rose gum (Eucalyptus grandis) and blue gum (Eucalyptus saligna) woods were exposed outdoors in a subtropical region for 360 days. We performed three collections every 120 days. We investigated color changes of untreated and weathered woods through a spectrophotometer (CIEL*a*b* system) and changes in macro compounds of wood through thermogravimetric analysis. In addition, the apparent contact angle and work of adhesion were evaluated using a goniometer. Outdoor exposure for 120 days provided significant increment in grayish of wood surface. Thermogravimetric curves of wood changed after the weathering, especially in the regions related to hemicelluloses and lignin thermal degradation. Outdoor exposure for 360 days converted hydrophilic wood surface into a very hydrophilic one, wherein occurrence of microcracks contributed to fully spreading of water droplets.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Natural weathering performance of three fast-growing Eucalypt woods

Cademartori

Missio

Mattos

et al. 2015

Maderas, Cienc. tecnol.

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“…Different investigations have found that the deterioration is primarily related to the decomposition of lignin (Hon and Minemura 2001;Bekhta and Niemz 2003;George et al 2005;Pandey 2005a;Sharratt et al 2009;Popescu et al 2011;Teacǎ et al 2013;Calienno et al 2014;Bonifazi et al 2015). Free phenoxyl radicals are created during lignin degradation, and these further react with oxygen to produce carbonyl chromophoric groups (Tolvaj and Faix 1995;Colom et al 2003;Xie et al 2005;Gou and Guan 2010;Rosu et al 2010). These are then responsible for the color change of wood.…”

Section: Introductionmentioning

confidence: 99%

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

Tolvaj¹,

Popescu²,

Molnár³

et al. 2015

BioResources

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Spruce and beech samples were irradiated by UV light in humid (100% air humidity) and dry conditions to clarify the effects of vapor on photodegradation. UV-irradiated samples were also soaked in distilled water for comparison. The color change and the IR absorption spectra were measured. The wet condition generated considerably greater discoloration than did the dry condition. The intensity of the color change was higher at elevated temperature (53 °C) than at 32 °C. The results showed that the presence of water as vapor increased the degradation of lignin. The nonconjugated carbonyl groups absorbing around 1760 cm -1 were found not to be stable, and the number of these chemical groups decreased in the presence of vapor when compared against the dry condition. The rising temperature amplified this degradation effect.

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“…Accelerated artificial ageing tests under the action of UV radiation (Roşu et al 2010;Persze and Tolvaj 2012;Timar et al 2016) and /or temperature (Matsuo et al 2011;Boeva et al 2015) are often employed to obtain data useful for understanding and potentially predicting natural ageing effects. As color is highly sensitive to ageing, color measurements in the CIE Lab system have been often employed for monitoring wood ageing (Matsuo et al 2009(Matsuo et al , 2011Roşu et al 2010;Persze and Tolvaj 2012;Tolvaj et al 2013;Timar et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Effects of Ageing on the Color and Surface Chemistry of Paulownia Wood (P. elongata) from Fast Growing Crops

Liu¹,

Timar²,

Varodi³

et al. 2016

BioResources

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The behavior of paulownia wood (Paulownia elongata) was investigated using three different ageing tests: simulated natural ageing under the influence of light under indoor conditions, temperature-induced ageing in the dark, and UV-induced ageing. Ageing effects were evaluated by color measurements in the CIE Lab system. Simulated natural ageing of wood in indoor conditions (6 months) and UV-accelerated ageing (72 h) are complex and dynamic processes, which resulted mostly in yellowing of the samples due to photo-degradation. Temperature-induced ageing (288 h at 100 C) resulted mostly in a rapid and visible darkening of the paulownia wood. Comparative in-time evolution of color changes during accelerated UV ageing testing and simulated natural ageing testing under indoor conditions allowed the estimation of an acceleration index of about 50X. Fourier transform infrared spectroscopy (FTIR) was used to examine specific chemistry changes occurring during these ageing tests. UV light from natural or artificial sources caused primarily lignin degradation followed by oxidative processes leading to carbonylcontaining chromophores. Temperature-induced partial degradation of hemicelluloses and oxidative processes resulted in the formation of chromophores containing mostly conjugated carbonyl groups. This research highlighted that paulownia wood (P. elongata) is quite sensitive to ageing under the action of light and temperature, which cause notable color and surface chemistry changes.

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FTIR and color change of the modified wood as a result of artificial light irradiation

Cited by 151 publications

References 18 publications

Natural weathering performance of three fast-growing Eucalypt woods

Natural weathering performance of three fast-growing Eucalypt woods

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

Effects of Ageing on the Color and Surface Chemistry of Paulownia Wood (P. elongata) from Fast Growing Crops

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