Study of the effect of photo-irradiation on the surface chemistry of wood

Pandey, Krishna K.

doi:10.1016/j.polymdegradstab.2005.02.009

Cited by 343 publications

(236 citation statements)

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“…A su vez, estas reacciones son debidas a la absorción de luz solar ultravioleta y visible (Evans et al 2002, Pandey 2005) y a la posterior lixiviación del material degradado por la acción del intemperismo natural (lluvias, humedad y viento) (Sudiyani et al 2003, Chang et al 2010.…”

Section: Resultados Y Discusiónunclassified

“…Según Pandey (2005), las maderas con contenidos de guaiacol-siringol equilibrados en la composición de su lignina (lignina típica de maderas duras) tienden a presentar mayor resistencia a la fotodegradación, debido a que durante la oxidación de sus grupos cromóforos forman en menor proporción grupos carbonílicos y carboxílicos. En el trabajo de Santos et al (2014), analizando la lignina extraída por el método organosolv de material de la misma procedencia del presente estudio, los autores reportaron que la madera de Corymbia citriodora ha presentado un menor contenido de lignina, mayores índices de componentes fenólicos, y una mayor proporción S/G (razón entre los contenidos de sirongol y guaiacol-siringol) comparado con la madera de Eucalyptus tereticornis.…”

Section: Resultados Y Discusiónunclassified

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Color de la madera de dos eucaliptos expuestas al intemperismo natural en tres entornos ambientales diferentes

Delucis

Herrera²,

Labidi³

et al. 2016

Maderas, Cienc. tecnol.

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RESUMENLa degradación superficial en madera de exteriores se debe a una combinación de factores meteorológicos inherentes al entorno de exposición y a la colonización de organismos xilófagos. Desde un punto de vista técnico y económico se trata de uno de los principales problemas para la industria de productos y materiales hechos a partir de la madera. El objetivo del presente trabajo es el de monitorizar la degradación superficial de las maderas de Corymbia citriodora y Eucalyptus tereticornis originarias de plantaciones de rápido crecimiento de Brasil, las cuales han sido expuestas a ensayos de intemperismo natural en tres entornos ambientales distintos. La monitorización de los cambios en el material fue realizada mediante estimaciones del color (método CIEL*a*b*), en ciclos de 45 días, hasta completar un periodo de 360 días de exposición. Los resultados mostraron que el material expuesto al entorno forestal fue menos afectado por los factores ambientales, lo que ha sido probablemente debido al aislamiento térmico y solar que proporciona este tipo de ecosistema. A su vez, se observó que las probetas de madera de Corymbia citriodora presentaron mayor resistencia al deterioro que las probetas de madera de Eucalyptus tereticornis, posiblemente debido a ciertas diferencias en su constitución química.Palabras clave: Biodegradación, biodeterioro, Corymbia citriodora, Eucalyptus tereticornis, fotodegradación. ABSTRACTSurface degradation in outdoor wood and products is due to a combination of inherent climate factors together with colonization of decay organisms. From a technical and economic standpoint it is one of the main problems for the industry of products and materials made from wood. The aim of this work is to track the surface degradation of Corymbia citriodora and Eucalyptus tereticornis timbers originating from fast-growing plantations in Brazil, which have been exposed to outdoor weathering tests in three different environmental conditions. Changes in the material were monitoring using color measurement (CIEL*a*b* method), in cycles of 45 days up to a period of 360 days of exposure. The results showed that timber exposed to a forest ecosystem was less affected by environmental factors; this is probably due to climate insulation provided by these ecosystems. Besides, it was observed that samples of Corymbia citriodora had higher resistance to degradation compared with samples of Eucalyptus tereticornis, possibly due to differences in its chemical constitution.

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Section: Resultados Y Discusiónunclassified

Color de la madera de dos eucaliptos expuestas al intemperismo natural en tres entornos ambientales diferentes

Delucis

Herrera²,

Labidi³

et al. 2016

Maderas, Cienc. tecnol.

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“…In the field of wood science and wood technology, applications of FTIR spectroscopy emerged in identification of wood species (Barker & Owen 1999, Colom & Carillo 2005, Nuopponen et al 2006a, in determination of the nature of wood modifications made for protection against biological threads and weathering (Zollfrank & Wegener 2002, Tingaut et al 2005, Tjeerdsma & Militz 2005, physical, chemical and microbial deterioration of wood including historical and modified wood (e.g. see Nuopponen et al 2004, Pandey 2005, Genestar & Palou 2006, Pandey & Chandrashekar 2006, Prakash et al 2006, sorption of chemical compounds by wood , fibre properties (Burgert et al 2005), the nature of bonding in wood composites and wood-plastic composites , Okuda et al 2006, and paper quality, aging and/or origin (Duran & Angelo 1998, Proniewicz et al 1999, Jaaskelainen et al 2003, Lojewska et al 2005, Calvini et al 2006, Eriksson et al 2006, Polovka et al 2006, and in analysis of lignin and wood pyrolysis and coalification (Sharma et al 2004, Drobniak & Masterlerz 2006.…”

Section: Applications Of Ftir Analysismentioning

confidence: 99%

“…By increased formation of lignin and suberin, the genetic condition of resistance to the Dutch elm disease (mediated by the ascomycete Ophiostoma novo-ulmi) can be predicted in elms to a certain probability by FTIR spectroscopy (Martín et al 2005). Chemical changes in wood caused through decay by white-and brown-rot fungi can be recorded by FTIR spectroscopy , Backa et al 2001, Pandey & Pitman 2003, Mohebby 2005, Humar et al 2006) as well as effects of wood weathering by photo-irradiation and water leaching (Nuopponen et al 2004, Pandey 2005. Such knowledge is of importance both for understanding the process of natural material recycling (see Chapter 17 of this book) and for undertaking effective measures in wood protection (see Chapter 13 of this book).…”

Section: Applications Of Ftir Analysismentioning

confidence: 99%

Wood production, wood technology, and biotechnological impacts

Kües¹

2007

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“…Aromatic and phenolic units, in the presence of light, act as sites for the initiation of radical chained reactions (Hon and Shiraishi 2001). In general, wood colour changes (DE* values) caused by weathering are directly correlated with lignin degradation rate and the formation of carbonyl groups (Pandey 2005b). On the other hand, light cannot penetrate the wood more than 200 µm.…”

Section: Introductionmentioning

confidence: 99%

Effects of oleothermal treatment and polydimethylsiloxane (PDMS) coating on natural weathering of beech and fir woods

Saei

Mohebby

Abdeh

2015

Maderas, Cienc. tecnol.

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Effects of natural weathering on oleothermally treated wood and coated with an organic silicone compound were studied. Slats of beech and fir woods were cut in sizes of 20×10×1 cm. The slats were treated by soybean oil at 230˚C for 1 h. Then, the half of the untreated and oleothermally treated slats were coated with polydimethylsiloxane (PDMS) and the rest of them were considered as control. All slats were hanged in 45˚ angle at the southwest (SW) direction for 90 days. They were analyzed for color changes, roughness, and contact angle properties at 30-day intervals. Results showed that the oleothermal treatment of wood reduced discoloration of fir samples against natural weathering; however, the reducing effect was lower in the Beech samples. This treatment also reduced the surface roughness of the fir samples during weathering while it increased the surface roughness of beech. Wettability of the samples in both species, before and after weathering, was reduced by the oleothermal treatment. Results also revealed that coating of the wood surface with PDMS does not prevent the discoloration and surface roughness against weathering. Nevertheless, the coating could considerably decrease the hydrophilicity of the woods even after weathering.

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Study of the effect of photo-irradiation on the surface chemistry of wood

Cited by 343 publications

References 34 publications

Color de la madera de dos eucaliptos expuestas al intemperismo natural en tres entornos ambientales diferentes

Color de la madera de dos eucaliptos expuestas al intemperismo natural en tres entornos ambientales diferentes

Wood production, wood technology, and biotechnological impacts

Effects of oleothermal treatment and polydimethylsiloxane (PDMS) coating on natural weathering of beech and fir woods

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