FTIR spectroscopy of woods: A new approach to study the weathering of the carving face of a sculpture

Emmanuel, Vartanian; Barrès, Odile; Roque, Céline

doi:10.1016/j.saa.2014.10.011

Cited by 89 publications

(35 citation statements)

References 17 publications

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“…Increasing the amount of acetyl groups and carboxylic acid groups from lignin and saccharides may also be the cause of absorbance growth [21,28]. The cause of these changes is the splitting of aliphatic side chains in lignin and cleavage of β-O-4 linkages, during thermal treatment [29,30]. The band near 1600 cm −1 (C=C stretching of the aromatic ring in lignin) is related to unsaturated linkages and aromatic rings present in lignin [31].…”

Section: Ftir Spectra Of Lignin Isolated From Heat Treated Samplesmentioning

confidence: 99%

Structural Changes of Oak Wood Main Components Caused by Thermal Modification

2020

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Thermal modification of wood causes chemical changes that significantly affect the physical, mechanical and biological properties of wood; thus, it is essential to investigate these changes for better utilization of products. Fourier transform infrared spectroscopy and size exclusion chromatography were used for evaluation of chemical changes at thermal treatment of oak wood. Thermal modification was applied according to Thermowood process at the temperatures of 160, 180 and 210 °C, respectively. The results showed that hemicelluloses are less thermally stable than cellulose. Chains of polysaccharides split to shorter ones leading to a decrease of the degree of polymerization and an increase of polydispersity. At the highest temperature of the treatment (210 °C), also crosslinking reactions take place. At lower temperatures degradation reactions of lignin predominate, higher temperatures cause mainly condensation reactions and a molecular weight increase. Chemical changes in main components of thermally modified wood mainly affect its mechanical properties, which should be considered into account especially when designing various timber constructions.

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Section: Ftir Spectra Of Lignin Isolated From Heat Treated Samplesmentioning

confidence: 99%

Structural Changes of Oak Wood Main Components Caused by Thermal Modification

2020

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“…5 together with the spectrum of bare wood sample. The latter spectrum contains only low intensity bands originating from the stretching vibrations of O-H bonds in the range of 3600-3000 cm -1 and overlapped bending and scissoring vibrations of m(C-C), m(C-O) and m s (C-O-C) bonds in the range of 1100-900 cm -1 characteristic of cellulose, lignin and hemicellulose (Emmanuel et al 2015), whereas in the spectra of F1-F3, FS1-FS3 samples several new bands of significantly higher intensities appeared in the ranges of 3600-2800, 1800-1500 and 1300-750 cm -1 . A broad band observed in the range from 3600 to 3000 cm -1 should be attributed to the presence of the silanol (Si-OH) groups formed as a result of hydrolysis of triethoxysilyl groups of the employed silanes.…”

Section: Analysis Of Surface Morphologymentioning

confidence: 99%

Wood protective coatings based on fluorocarbosilane

Szubert

Dutkiewicz

et al. 2019

Cellulose

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The effectiveness of protective coatings based on 3- (2,2,3,3,4,4,5,5-octafluoropentyloxy)propyltriethoxysilane in the protection of wood surface from the effects of water was tested. No earlier attempts at using the mentioned fluorocarbosilane for the protection of wood have been reported in the literature. The coatings were deposited by the sol-gel method. As a result of the generation of chemical bonds between the wood surface and silane, a coating was produced that permanently increased the wood hydrophobicity. Fluorinated chains attached to the silicon atoms make an effective barrier preventing the access of water and limiting the effects of water on the wood surface.

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“…Most of the characteristic band intensity of lignin significantly decreased. The absorption intensities of both the heat-treated and untreated specimens rapidly decreased during artificial weathering, which indicates a serious degradation of the lignin of the cell wall by UV irradiation (Emmanuel et al 2015). The absorption peaks at around 1425 cm -1 , 1373 cm -1 , and 1317 cm -1 that were assigned to cellulose showed no discernible difference in the spectra of heat-treated versus untreated specimens (Bui et al 2015), which demonstrates similarity in the degradation of cellulose after long-term artificial weathering.…”

Section: Chemical Analysis With Ftir Spectroscopymentioning

confidence: 99%

Effect of Artificial Weathering on the Properties of Industrial-Scale Thermally Modified Wood

Dong¹,

Wang²,

Li³

2015

BioResources

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Thermally modified wood is widely used in cladding, decking, and other construction projects that are meant for outdoor exposure. The purpose of this study was to investigate changes in the color, microstructure, and chemical composition of heat-treated, Larix spp. wood that was exposed to artificial weathering. In this study, accelerated weathering tests (UV and moisture) were conducted over a period of 3000 h. Photodegradation of both heat-treated and untreated wood was evaluated in terms of color, microstructure, and chemical changes that were characterized using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. Ultra-violet radiation caused the degradation of lignin and extractives of wood, resulting in an immediate color change of the wood. The SEM observation of the heat-treated wood showed deformations and cracks in both treated and untreated samples. Irradiation resulted in a pronounced reduction in the absorption intensity and broadening of the FTIR spectra. It was found that the industrial heattreatment of wood products resulted in more color stability than untreated wood during the early stages of weathering. Thermal modification was found, however, was ineffective in improving the UV resistance wood over long-term photodegradation conditions.

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FTIR spectroscopy of woods: A new approach to study the weathering of the carving face of a sculpture

Cited by 89 publications

References 17 publications

Structural Changes of Oak Wood Main Components Caused by Thermal Modification

Structural Changes of Oak Wood Main Components Caused by Thermal Modification

Wood protective coatings based on fluorocarbosilane

Effect of Artificial Weathering on the Properties of Industrial-Scale Thermally Modified Wood

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