Mechanical interaction between cellulose microfibrils and matrix substances in wood cell walls induced by repeated wet-and-dry treatment

Toba, Keisuke; Yamamoto, Hiroyuki; Yoshida, Masato

doi:10.1007/s10570-012-9700-x

Cited by 27 publications

(15 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When water enters the cell wall, it therefore causes swelling of the material, occupying space between the microfibrils and thereby forcing them apart. Furthermore, the microfibrils themselves experience a change in dimensions Yamamoto 2005, 2006;Zabler et al 2010;Toba et al 2012). Swelling also results in increased cell wall dimensions.…”

Section: Hygro-expansion and Sorption Hysteresismentioning

confidence: 99%

A critical discussion of the physics of wood–water interactions

et al. 2012

View full text Add to dashboard Cite

This paper reviews recent findings on wood-water interaction and puts them into context of established knowledge in the field. Several new findings challenge prevalent theories and are critically discussed in an attempt to advance current knowledge and highlight gaps. The focus of this review is put on water in the broadest concept of wood products, that is, the living tree is not considered. Moreover, the review covers the basic wood-water relation, states and transitions. Secondary effects such as the ability of water to alter physical properties of wood are only discussed in cases where there is an influence on state and/or transition.

show abstract

Section: Hygro-expansion and Sorption Hysteresismentioning

confidence: 99%

A critical discussion of the physics of wood–water interactions

et al. 2012

View full text Add to dashboard Cite

show abstract

“…It is well known that X-ray diffraction (XRD) techniques provide valuable information about molecular conditions of crystalline cellulose in wood cell walls (e.g., microfibril angle (MFA) [3,4], crystallinity [5][6][7], crystal lattice spacing [8][9][10][11][12][13]). Some researchers found a relationship between stress loading in the longitudinal direction of wood and changes in the crystal lattice spacing [11,12,[14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Creep and stress relaxation behavior for natural cellulose crystal of wood cell wall under uniaxial tensile stress in the fiber direction

2018

Self Cite

View full text Add to dashboard Cite

We investigated the temporal changes in creep and stress relaxation behavior in both microscopic crystalline cellulose and macroscopic strain of wood specimen using Japanese cypress (Chamaecyparis obtusa Endl.) to understand the viscoelastic properties of wood cell walls. Specimens 600 µm in thickness were observed by the X-ray diffraction and submitted to tensile load. The crystal lattice strain of (004) plane and macroscopic strain of specimen were continuously detected during creep and stress relaxation tests. It was found that the creep compliance based on macroscopic strain showed a gradual increase after instantaneous deformation due to loading and then the parts of creep deformation remained as permanent strain after unloading. On the other hand, crystal lattice strain showed a different behavior for macroscopic strain; it kept a constant value after instantaneous deformation due to loading and then increased gradually after a certain period of time. These differences between macroscopic and microscopic levels were never found in the stress relaxation tests in this study. Relaxation modulus at the macroscopic level only showed a decreasing trend throughout the relaxation process. However crystal lattice strain kept a constant value during the macroscopic relaxation process. In addition, the microfibril angle (MFA) of wood cell wall has a role of mechanical behavior at microscopic level; crystal lattice strains were smaller with increasing MFA at both creep and relaxation processes. Creep compliance and stress relaxation modulus at the macroscopic level decreased and increased with increasing MFA, respectively. Our results on the viscoelastic behavior at microscopic level evidenced its dependency on MFA.

show abstract

“…They have been used to assess the performance and characterize the kinematics of composite materials [3; 6]. X-ray diffraction methods have been used for wood to evaluate how the cellulose crystal strains in response to different loading, such as elastic [7][8][9][10][11][12], viscoelastic [13; 14] or mechanosorptive [13] strains, hygro-thermal treatments [15][16][17] , chemical treatments [17], drying [17; 18], stress release [17; 18] or stress induced by biological transformations [19]. Montero et al [12] probed the behaviour of crystalline cellulose during elastic deformations of poplar wood.…”

Section: Introductionmentioning

confidence: 99%

Contribution of cellulose to the moisture-dependent elastic behaviour of wood

Alméras¹,

Gronvold²,

Lee

et al. 2017

Composites Science and Technology

View full text Add to dashboard Cite

International audienceWood has a hierarchical structure involving several levels of organisation. The stiffness of wood relies on its capacity to transfer mechanical stress to its stiffest element at the lowest scale, namely crystalline cellulose. This study aims at quantifying to what extend crystalline cellulose contributes to wood stiffness depending on its moisture content. The crystal strains of cellulose were measured using X-ray diffraction on wet and dry specimens of spruce, based on a previously published methodology. The comparison between crystal strain and macroscopic strain shows that, during elastic loading, cellulose strain is lower than macroscopic strain. The means ratio of crystal/macroscopic strain amounts 0.85 for dry specimens and 0.64 for wet specimens. This strain ratio cannot be explained just by the projection effect due to the difference in orientation between cellulose microfibrils and cell wall, but results from deformation mechanisms in series with cellulose. Analysis shows that this series contribution represents a non-negligible contribution to wood compliance and is strongly moisture-dependent. This contribution amounts 9% for dry specimens and 33% for wet specimens, corresponding to a 4-fold increase in compliance for the series contribution. The origin of these strains is ascribed to mechanisms involving bending or shear strain at different scales, due to the fact that reinforcing element are neither perfectly straight nor infinitely long

show abstract

Mechanical interaction between cellulose microfibrils and matrix substances in wood cell walls induced by repeated wet-and-dry treatment

Cited by 27 publications

References 13 publications

A critical discussion of the physics of wood–water interactions

A critical discussion of the physics of wood–water interactions

Creep and stress relaxation behavior for natural cellulose crystal of wood cell wall under uniaxial tensile stress in the fiber direction

Contribution of cellulose to the moisture-dependent elastic behaviour of wood

Contact Info

Product

Resources

About