Effect of Thermo-Vacuum Treatment on the Color and Chemistry of Larch Wood

Wang, Zhe; Sun, Bo; Liu, Junliang

doi:10.15376/biores.11.1.2349-2360

Cited by 8 publications

(3 citation statements)

References 37 publications

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“…In recent years, the thermo-vacuum modification of wood has been developed as a new method to decrease the effects of oxygen on the loss of mechanical properties during heat treatment [18,19]. It has been found that the thermo-vacuum modification can also improve the dimensional stability of wood [1,20].…”

Section: Introductionmentioning

confidence: 99%

Changes of chemical properties and the water vapour sorption of Eucalyptus pellita wood thermally modified in vacuum

2017

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The aim of this study was to evaluate the chemical composition and the dynamic water vapour sorption properties of Eucalyptus pellita wood thermally modified in vacuum. For this purpose, wood samples were thermally modified in a vacuum oven at 160-240°C for 4 h. Chemical composition were investigated by wet chemical analysis, elemental analysis, as well as Fourier transform infrared (FTIR) analysis, and dynamic water vapour sorption properties were evaluated by dynamic vapour sorption apparatus. The results showed that holocellulose and alpha-cellulose contents decreased and lignin and extractives contents relatively increased during the heat process. Elemental analysis showed a reduction in hydrogen content and an increase in carbon content. FTIR analysis indicated that the degradation of hemicellulose and condensation reactions of lignin occurred. In addition, the thermo-vacuum resulted in a reduction in the equilibrium moisture content of wood during the adsorption or desorption process. And the sorption hysteresis had a decreasing trend with increasing treatment temperature. The development of the hygroscopicity was related to the increase in the relative content of lignin, the degradation of the carbonyl groups in xylan and the loss of carbonyl group linked to the aromatic skeleton in lignin after heat treatment.

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Section: Introductionmentioning

confidence: 99%

Changes of chemical properties and the water vapour sorption of Eucalyptus pellita wood thermally modified in vacuum

2017

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“…This indicates that the surface color of the compacts became darker with the increase of the forming pressure. The changes may also be due to the continuous thermal degradation of chemical components in the compacts with the increase of the holding time (Wang et al 2016).…”

Section: Effect Of the Holding Time On Color Changes Of The Compactsmentioning

confidence: 99%

Effect of hot-pressing process on mechanical properties and color changes of poplar powder compacts

Long

Zhang

Tan

et al. 2021

BioRes

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Binderless poplar powder compacts were prepared using the hot-pressing technology. The effect of the forming process on the mechanical properties and surface color of the poplar powder compacts was studied. The effect of forming temperature on mechanical properties and surface color was more noticeable than the forming pressure and the holding time. With the change of the forming process parameters, the static bending strength of the compacts increased first and then decreased. The overall change trend of the surface hardness increased continuously. The overall color difference (ΔE*) of the compacts increased with the change of forming process parameters and the surface color deepened gradually. The results of Fourier transform infrared (FTIR) spectroscopy showed that hemicellulose, cellulose, and lignin in the compacts were greatly affected by the forming process parameters. The degradation of hemicellulose and cellulose produced many colored substances, and the content of lignin increased. These made the surface color of compacts deepen.

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“…The reason for the strength decline after 140 ℃ may be the mechanical strength reduction caused by the destruction of hemicellulose chain. Nevertheless, the fibers were eventually carbonized and the strength was reduced at higher temperature (Wang et al 2016).…”

Section: Mechanical Properties In Warm Compactionmentioning

confidence: 99%

Temperature’s effect on color change and mechanical properties of poplar powder compact formed by warm compaction

Zhang

Long

Tan

et al. 2020

BioRes

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Warm compaction technology is an eco-friendly method to improve the added value of poplar. In this work, the wood powder was compacted in the mold between 120 °C to 200 °C, at 80 MPa for 30 min. The color change, chemical properties, and mechanical properties were evaluated. The color of the formed compaction darkened uniformly. The CIE lightness color coordinate (L*) and chroma coordinates a* and b* decreased with the increase of forming temperature. Fourier infrared spectral analysis showed degradation of carbohydrates, along with the formation of a new chemical structure of darker color. Mechanical properties including modulus of rupture (MOR) and modulus of elasticity (MOE) of compacted wood increased initially and then decreased. These results provide a reference for the surface color control of thermally forming materials.

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Effect of Thermo-Vacuum Treatment on the Color and Chemistry of Larch Wood

Cited by 8 publications

References 37 publications

Changes of chemical properties and the water vapour sorption of Eucalyptus pellita wood thermally modified in vacuum

Changes of chemical properties and the water vapour sorption of Eucalyptus pellita wood thermally modified in vacuum

Effect of hot-pressing process on mechanical properties and color changes of poplar powder compacts

Temperature’s effect on color change and mechanical properties of poplar powder compact formed by warm compaction

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