Influence of delignification on plastic flow deformation of wood

Seki, Masayuki; Yashima, Yuko; Abe, M.; Miki, Tsunehisa; Nishida, Masakazu

doi:10.1007/s10570-022-04555-0

Cited by 15 publications

(5 citation statements)

References 32 publications

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“…The results of dynamic viscoelasticity measurements of delignified hinoki (R specimen) reported that the stronger the degree of delignification, the greater the decrease in E′ at lower temperatures, and the tendency for the peak temperature of tanδ to shift to lower temperatures [19]. Similarly, it has been reported that the peak temperature of tanδ for hinoki wood also shifts to the lower temperature side with the progress of delignification [20]. Seki et al reported from nuclear magnetic resonance (NMR) and attenuated total reflection-infrared spectroscopy (ATR-IR) measurements Hardwood : ▲ ▲ ▲ Tangential direction (LW) ▲ ▲ ▲ Tangential direction (EW) ▲ ▲ ▲ Radial direction Fig.…”

Section: Resultsmentioning

confidence: 91%

“…3 for more details that the benzene ring of the guaiacyl unit on the surface of the lignin unit is oxidized to form a carboxyl group in the initial stage of delignification (treatment time 10 min), although the mass loss is slight [20,21]. Even in the initial stage of delignification, the thermo-softening temperature decreases by about 5 °C [20]. In other words, the peak temperature of tanδ decreases even if the structural change is not large enough to cleave the lignin unit.…”

Section: Resultsmentioning

confidence: 99%

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Thermal softening properties of various wood species within an annual ring

Horiyama,

Miyoshi,

Kojiro

et al. 2023

J Wood Sci

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Dynamic mechanical analysis (DMA) measurements of water-saturated earlywood (EW) and latewood (LW) of various wood species in the temperature range from 0 to 100 °C were focused to clarify the differences in thermal softening properties within an annual ring. The following results were obtained. The peak of tanδ caused by micro-Brownian motion of lignin was observed in both EW and LW all species. For softwoods, the peak temperatures of tanδ of EW appeared at higher temperatures than those of LW. For hardwoods, in the other hand, the peak temperatures of tanδ were slightly different between EW and LW in the diffuse-porous wood, whereas the temperatures were almost the same in the ring-porous wood. It was found that the difference in peak temperature of tanδ between EW and LW varied greatly among species. The difference in peak temperature between EW and LW was relatively large for softwoods. In addition, the thermal softening properties both in the radial and tangential directions differed depending on the species, so this suggested that there was anisotropy in the thermal softening properties depending on the species.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Thermal softening properties of various wood species within an annual ring

Horiyama,

Miyoshi,

Kojiro

et al. 2023

J Wood Sci

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“…Furthermore, wood with lower lignin removal, such as Choiba, experiences less structural collapse, while wood with high lignin removal, such as Andiroba, recovers its elasticity. Deligni cation can affect the polysaccharides, causing larger deformations in the wood, and the plastic ow deformation of the cell (Seki et al 2022).…”

Section: )mentioning

confidence: 99%

Alkaline Delignification of Tropical Hardwoods: A promising Approach for Sustainable Material Development

Maturana,

Arroyave,

Hurtado

et al. 2023

Preprint

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Wood delignification is a promising approach for developing sustainable materials from tropical hardwoods. This study investigated the uniformity and efficiency of partial alkaline delignification of three commercially important tropical hardwoods (Andiroba, Sande, and Choiba) using a mixed aqueous solution of sodium hydroxide and sodium sulfite (NaOH/Na2SO3) as a pretreatment for densification. The effects and distribution of the solution under the influence of the anatomical features of each hardwood were analyzed using FT-IR, optical microscopy, and SEM. The process resulted in the partial removal of lignin and hemicellulose in varying proportions between the center and ends of the wood. This reduction in lignin and hemicellulose content led to a decrease in MOE, MOR, and hardness of the delignified wood. Additionally, the results suggest that sodium accumulation in the wood structure may also modify its mechanical properties. The relationship between the chemical treatment and the anatomical characteristics of the wood species was found to influence delignification, which in turn affected the effectiveness of densification and subsequent compression. The findings of this study suggest that alkaline delignification is a promising approach for developing new materials from tropical hardwoods, but further research is needed to optimize the process and minimize the negative impact on mechanical properties.

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“…Abe et al investigated the application of esterification methods such as propionylation to block-shaped wood to give it thermal plasticity [18] and successfully molded it into a cup shape in molding tests [19]. Seki et al studied treatments for wood components and delignified wood to improve flowability [20]. As for only wood forming, Yamashita et al formed a gear by transfer forming of bamboo [21].…”

Section: Introductionmentioning

confidence: 99%

Deep Container Fabrication by Forging with High- and Low-Density Wood

Uejima,

Kuboki,

Tanaka

et al. 2024

JMMP

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This paper presents a method for applying forging to high-density wood. A cylindrical container was formed using a closed die, and the appropriate conditions for temperature and punch length were evaluated. Ulin, which is a high-density wood, and Japanese cedar, which is a low-density wood and widely used in Japan, were used as test materials. The pressing directions were longitudinal and radial based on wood fiber orientation, and the shape and density of the resulting containers were evaluated. In the case of ulin, cracks decreased by increasing the temperature, while temperature had little effect on Japanese cedar. Containers without cracks were successfully formed by using a punch of appropriate length. The density of the containers was uniform in the punch length l = 20 and 40 mm in the L-directional pressing and l = 20 mm in the R-directional pressing when using ulin, with an average density of 1.34 g/cm3. This result indicates the forging ability of ulin is high compared to that of commonly used low-density woods. In summary, this paper investigated the appropriate parameters for forging with ulin. As a result, products of more uniform density than products made by cutting were obtained.

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Influence of delignification on plastic flow deformation of wood

Cited by 15 publications

References 32 publications

Thermal softening properties of various wood species within an annual ring

Thermal softening properties of various wood species within an annual ring

Alkaline Delignification of Tropical Hardwoods: A promising Approach for Sustainable Material Development

Deep Container Fabrication by Forging with High- and Low-Density Wood

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