FTIR analysis of chemical changes in wood induced by steaming and longitudinal compression

Báder, Mátyás; Németh, Róbert; Sandak, Jakub; Sandak, Anna

doi:10.1007/s10570-020-03131-8

Cited by 34 publications

(24 citation statements)

References 44 publications

(49 reference statements)

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“…Blanchet et al [ 22 ] reported a small negative effect of the vacuum drying process on the mechanical properties of wood, when compared to conventional oven drying. However, noticeable chemical changes in wood polymers as well as its hygroscopic properties because of high-temperature heat treatment were reported by several researchers [ 23 , 24 , 25 , 26 ]. These chemical changes are expected, therefore, to affect other material characteristics including strength and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Drying Method of Pine and Beech Wood on Fracture Toughness and Shear Yield Stress

et al. 2020

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The modern wood converting processes consists of several stages and material drying belongs to the most influencing future performances of products. The procedure of drying wood is usually realized between subsequent sawing operations, affecting significantly cutting conditions and general properties of material. An alternative methodology for determination of mechanical properties (fracture toughness and shear yield stress) based on cutting process analysis is presented here. Two wood species (pine and beech) representing soft and hard woods were investigated with respect to four diverse drying methods used in industry. Fracture toughness and shear yield stress were determined directly from the cutting power signal that was recorded while frame sawing. An original procedure for compensation of the wood density variation is proposed to generalize mechanical properties of wood and allow direct comparison between species and drying methods. Noticeable differences of fracture toughness and shear yield stress values were found among all drying techniques and for both species, but only for beech wood the differences were statistically significant. These observations provide a new highlight on the understanding of the effect of thermo-hydro modification of wood on mechanical performance of structures. It can be also highly useful to optimize woodworking machines by properly adjusting cutting power requirements.

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Section: Introductionmentioning

confidence: 99%

Effect of the Drying Method of Pine and Beech Wood on Fracture Toughness and Shear Yield Stress

et al. 2020

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“…Figure 3 shows infrared spectra for the woods that were studied. In comparison with untreated wood, the thermally treated woods showed prominent bands at 1030, 1250, 1650, 2930, and 3400 cm −1 , corresponding to lignin, syringyl units from lignin, cellulose, hemicelluloses, and hydroxyl groups, respectively 41 . These are associated with changes in OH vibrations, mainly from cellulose, but also from aromatic compounds from lignin.…”

Section: Resultsmentioning

confidence: 94%

Effect of the temperature of the heat treatment of pine wood on subsequent in situ polymerization with poly(methyl methacrylate)

Acosta

Díaz

Amico

et al. 2022

Biofuels Bioprod Bioref

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The objective of this study was to evaluate a two-step Pinus elliottii modification process comprising thermal treatment at different temperatures (180 °C, 200 °C, or 220 °C) for 2 h followed by vacuum-pressure treatment and in situ polymerization with a highly pure solution of poly (methyl methacrylate) (PMMA). The treated samples were then characterized based on weight loss, weight gain, density, Fourier transform infrared spectroscopy, chemical constituents, thermal stability, dimensional stability, surface hydrophobicity, morphology, color changes, and mechanical properties. Thermal modification prior to impregnation increased thermal stability (~100%-150%) in comparison with heattreated pine wood. Furthermore, after the two-step treatment, the color presented similar patterns and a lower level of water uptake (~40%-60%). Post-treatment with PMMA recovered the losses in both stiffness and strength brought by thermal modification at 180 °C and 200 °C; however, the treatment at 220 °C was found to be unsuitable for the two-step process.

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“…A similar curve for the treated impregnated organoclay/PMFM pulai wood samples revealed the presence of hemicelluloses, cellulose, and lignin. The OH stretching groups on the cellulose molecules and CH stretching vibrations caused the wide peaks between 3600 to 3000 cm -1 , and 3000 to 2800 cm -1 , respectively (Báder et al 2020). The acetyl and ester groups of hemicellulose, or the ester linkage of carboxylic groups of ferulic and p-coumaric acids of lignin or hemicellulose, were ascribed to the significant peak intensities of the impregnated organoclay/PMFM pulai wood samples in the area between 1800 and 1700 cm -1 .…”

Section: Mechanical Propertiesmentioning

confidence: 95%

Characterization and optimization of organoclay- poly(melamine-co-formaldehyde)-methylated solution impregnated pulai (Alstonia spp.) wood using response surface methodology

Khui

Rahman

Yun

et al. 2022

BioRes

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Significant effects of organoclay and poly(melamine-co-formaldehyde)-methylated (PMFM) impregnation on the mechanical, morphological, and thermal characteristics of raw pulai wood were investigated in this work. The material’s modulus of elasticity (MOE) as well as the maximum compression force (MCF) of the impregnated organoclay/PMFM pulai wood samples were optimized using a designed experiment. The MOE and MCF models had R2 values of 0.9228 and 0.8340, respectively. After the impregnation of organoclay/PMFM pulai wood samples, the MOE and MCF increased considerably, indicating that the pulai wood’s mechanical characteristics had improved. The compositional analysis verified the polymerization and dispersion of organoclay and PMFM. Using Fourier transform infrared spectroscopy, reduction in the hydroxyl groups was detected. The impregnated organoclay/PMFM pulai wood samples had successfully filled the pores and cell cavities, as seen by scanning electron microscopy. The thermal stability of the impregnated organoclay/PMFM pulai wood samples was better than that of the raw pulai wood, with a higher glass transition temperature as determined by differential scanning calorimetry. The thermogravimetric study revealed that the impregnated organoclay/PMFM pulai wood samples had higher decomposition temperatures than the raw pulai wood sample.

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FTIR analysis of chemical changes in wood induced by steaming and longitudinal compression

Cited by 34 publications

References 44 publications

Effect of the Drying Method of Pine and Beech Wood on Fracture Toughness and Shear Yield Stress

Effect of the Drying Method of Pine and Beech Wood on Fracture Toughness and Shear Yield Stress

Effect of the temperature of the heat treatment of pine wood on subsequent in situ polymerization with poly(methyl methacrylate)

Characterization and optimization of organoclay- poly(melamine-co-formaldehyde)-methylated solution impregnated pulai (Alstonia spp.) wood using response surface methodology

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