The effect of lignin on the bending properties and fixation by cooling of wood

Nakajima, Masamitsu; Furuta, Yuzo; Ishimaru, Yutaka; Ohkoshi, Makoto

doi:10.1007/s10086-009-1019-3

Cited by 10 publications

(10 citation statements)

References 12 publications

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“…Nakajima et al . 16 observed the steep reductions occurred in the modulus of elasticity and modulus of rupture during the initial stage of delignification. Liu et al .…”

Section: Introductionmentioning

confidence: 90%

Effect of light-delignification on mechanical, hydrophobic, and thermal properties of high-strength molded fiber materials

Wang

Xiao

Cai

2018

Sci Rep

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This study developed a high-strength molded fiber material (HMFM) using pulp fibers, which could be a good substitute for plastic and solid wood materials. The surface composition, microstructure and thermal properties of HMFM were investigated by XPS, SEM and DSC, respectively. The SEM observations showed that the obvious adhesive substances and agglomeration appeared among fibers, and the inter-fiber contact area and binding tightness increased after the light-delignification. The XPS examination showed that the oxygen-rich composition on the outer surface of HMFM were reduced, and the outer surface coverage of lignin increased from 70.05% to 90.15% after the light-delignification. The DSC observation showed that the thermal stability of HMFM decreased, the temperature for the maximum rate of mass loss decreased from 370 °C to 345.6 °C, and the enthalpy value required for decomposition was reduced from 110.8 J/g to 68.0 J/g after the light-delignification. The mechanical and hydrophobic properties of HMFM were obviously improved after the light-delignification. When the content of lignin decreased from 24.9% to 11.45%, the density of HMFM increased by 6.0%, the tensile strength increased by 22.0%, the bending strength increased by 23.9%, and the water contact angle increased from 64.3°–72.7° to 80.8°–84.3°.

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“…Nakajima et al . 16 observed the steep reductions occurred in the modulus of elasticity and modulus of rupture during the initial stage of delignification. Liu et al .…”

Section: Introductionmentioning

confidence: 90%

Effect of light-delignification on mechanical, hydrophobic, and thermal properties of high-strength molded fiber materials

Wang

Xiao

Cai

2018

Sci Rep

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“…The glass transition temperature (T g ) of the lignin in moist wood is 80-100 °C. Above T g , the lignin undergoes thermoplastic flow and resets in the modified configuration when cooling (Nakajima et al 2009;Ibach 2010;USDA 2010).…”

Section: Solid Wood Bendingmentioning

confidence: 99%

The role of lignin in wood working processes using elevated temperatures: an abbreviated literature survey

Börcsök

Pásztory

2020

Eur. J. Wood Prod.

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The lignin, cellulose and hemicelluloses in wood are polymers that behave similarly to the artificial polymers and are bonded together in wood. Lignin differs from the other two substances by its highly branched, amorphous, three-dimensional structure. Under appropriate conditions, the moist lignin incorporated in the wood softens at about 100 °C and allows the molecules of it to deform in the cell walls. There are many advantages and disadvantages to this phenomenon. If we know this process accurately and the industrial areas where it matters, we may be able to improve these industrial processes. This article provides a brief theoretical summary of lignin softening and the woodworking processes where it plays a role: wood welding, pellet manufacturing, manufacturing binderless boards, solid wood bending, veneer manufacturing, and solid wood surface densification.

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“…Depending on the glassy transition of lignin, natural wood also has a certain shape memory effect, where temperature control and moisture content are essential for fixing natural wood deformation. For another, the compression of cell lumen and the slippage of cellulose fibers immensely weaken the shape memory properties of natural wood [31]. In this study, the anisotropic of wood mainly reflects in the distinction of shape memory performance along different bending direction.…”

Section: Resultsmentioning

confidence: 87%

Fabrication and Characterization of Thermal-Responsive Biomimetic Small-Scale Shape Memory Wood Composites with High Tensile Strength, High Anisotropy

Wang

Luo

et al. 2019

Polymers

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Intelligent responsive materials have become one of the most exciting fields in the research of new materials in the past few decades due to their practical and potential applications in aerospace, biomedicine, textile, electronics, and other relative fields. Here, a novel thermal-responsive biomimetic shape memory wood composite is fabricated utilizing polycaprolactone-based (PCL) shape-memory polymer to modify treated-wood. The shape memory wood inherits visual characteristics and the unique three-dimension structure of natural wood that endows the shape memory wood (SMW) with outstanding tensile strength (10.68 MPa) at room temperature. In terms of shape memory performance, the shape recovery ratio is affected by multiple factors including environment temperature, first figuration angle, cycle times, and shows different variation tendency, respectively. Compared with shape recovery ratio, the shape fixity ratio (96%) is relatively high and stable. This study supplies more possibilities for the functional applications of wood, such as biomimetic architecture, self-healing wood veneering, and intelligent furniture.

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The effect of lignin on the bending properties and fixation by cooling of wood

Cited by 10 publications

References 12 publications

Effect of light-delignification on mechanical, hydrophobic, and thermal properties of high-strength molded fiber materials

Effect of light-delignification on mechanical, hydrophobic, and thermal properties of high-strength molded fiber materials

The role of lignin in wood working processes using elevated temperatures: an abbreviated literature survey

Fabrication and Characterization of Thermal-Responsive Biomimetic Small-Scale Shape Memory Wood Composites with High Tensile Strength, High Anisotropy

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