Effects of Chemical Extraction Treatments on Nano-scale Mechanical Properties of the Wood Cell Wall

Zhang, Shuangyan; Fei, Bei-Hua; Wang, Chuangui

doi:10.15376/biores.11.3.7365-7376

Cited by 9 publications

(6 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zimmermann et al (2007) explained that increased NaOH concentration degrades hemicellulose, and that mannose is the most vulnerable to NaOH. This was con rmed by various other studies(Zhang et al 2016, Zhao et al 2008and Barman et al 2020). …”

supporting

confidence: 76%

Modifying the radiation ratio of tonewoods through wood degradation

Nefdt,

Meincken

2024

Preprint

View full text Add to dashboard Cite

This work investigates different wood modification techniques to modify the acoustical properties of tonewoods, in particular the sound radiation ratio (R). The treatments used were heat- and fungal exposure, as well as immersion into NaOH and Na2SO3 solution and a combination of the most successful treatments. All initial experiments were performed on pine (Pinus patula) due to cost factors, before replicating the best performing treatment on high quality spruce tonewood (Picea abies). The main objective was to reduce the hemicellulose content without severely degrading cellulose, which results in a reduction of density, while maintaining, or even improving the elasticity (MOEL), which results in an increase of R. Overall, the combined heat-fungal and heat-sodium treatments performed best and increased R by up to 20%. Sodium treatment led to the best increases in R, but compromised the wood structure in spruce and the treatment protocol needs to be developed further. Consequently, the most successful wood treatment to improve acoustical properties was determined to be exposure to white rot combined with heat treatment.

show abstract

supporting

confidence: 76%

Modifying the radiation ratio of tonewoods through wood degradation

Nefdt,

Meincken

2024

Preprint

View full text Add to dashboard Cite

show abstract

“…In previous studies, it has been shown that cellulose is the determining factor affecting the longitudinal mechanical properties of fibers [ 26 ], while lignin contributes to the elastic modulus [ 27 ]. The study of the changes in chemical functional groups and the compositional structure of bamboo fiber bundles during different heat treatments was of great importance for the analysis of their mechanical properties.…”

Section: Resultsmentioning

confidence: 99%

Effects of Thermal Treatment on the Mechanical Properties of Bamboo Fiber Bundles

Cui

et al. 2023

Materials

View full text Add to dashboard Cite

Bamboo is known as a typical kind of functional gradient natural composite. In this paper, fiber bundles were extracted manually from various parts of the stem in the radial direction, namely the outer, middle, and inner parts. After heat treatment, the mechanical properties of the fiber bundles were studied, including the tensile strength, elastic modulus, and fracture modes. The micromechanical properties of the fiber cell walls were also analyzed. The results showed that the mean tensile strength of the bamboo fiber bundles decreased from 423.29 to 191.61 MPa and the modulus of elasticity increased from 21.29 GPa to 27.43 GPa with the increase in temperature. The elastic modulus and hardness of the fiber cell walls showed a positive correlation with temperature, with the modulus of elasticity and the hardness increasing from 15.96 to 18.70 GPa and 0.36 to 0.47 GPa, respectively. From the outside to the inside of the bamboo stems, the tensile strength and elastic modulus showed a slight decrease. The fracture behavior of the fiber bundles near the outside approximates ductile fracture, while that of the bundles near to the inside tend to be a brittle fracture. The fracture surfaces of the bamboo bundles and the single fibers became smoother after heat treatment. The results show that bamboo fiber bundles distributed near the outside are most suitable for industrial development under heat treatment at 180 °C. Therefore, this study can provide a reasonable scientific basis for the selective utilization, functional optimization, and bionic utilization of bamboo materials, which has very important theoretical and practical significance.

show abstract

“…The cell wall of wood is the substantial bearing structure of wood, where cellulose microfibrils are the reinforcing phase, whereas lignin and hemicellulose form the matrix laminate structure. The distribution of cellulose, hemicellulose, and lignin in the cell wall, the way they are bound, and the properties of the components themselves noticeably influence the cell wall and the macroscopic mechanical properties of the wood (Zhang 2011). When wood is subjected to the cyclic effects of UV radiation, water spray, and high temperatures, the cell wall structure, distribution, and binding patterns of wood are damaged, and degradation of cellulose, hemicellulose, and lignin occurs, resulting in changes in the wood testing indexes.…”

Section: Changes Of Testing Indexes Under Nondestructive Testing Methodsmentioning

confidence: 99%

Effects of accelerated weathering test on the properties of larch wood

Cheng

Zhao

et al. 2021

BioRes

View full text Add to dashboard Cite

To investigate the changes of larch wood properties under the influence of long-standing exposure to the environment, the QUV accelerated weathering tester (fluorescent UV and condensation testers) was used to accelerate the weathering of wood within a given preset time, and the changes were studied by analogue simulation. The wood color changed noticeably under different weathering time, and it gradually darkened from light yellow to deep reddish brown. Scanning electron microscopic (SEM) analysis revealed that as the weathering time increased, the cell wall was broken, the pits were cracked, and the tracheids were damaged. The results of the energy spectrum analysis (O/C (oxygen/carbon)) showed an increasing trend in the ratio, indicating that the wood underwent an oxidation reaction induced by light. From the values of the two testing indexes and their change patterns with weathering time, the same trend was observed, with the values of modulus of elasticity (MOE) in static bending being greater than that in dynamic bending Ed (the dynamic modulus of elasticity). However, the variability of MOE was greater than that of Ed. A comparative analysis of the two detection indicators was performed. The relationship between the proposed combined correction Ed and weathering time was: y = 0.0000001017 t2 – 0.0006 t + 9.77.

show abstract

Effects of Chemical Extraction Treatments on Nano-scale Mechanical Properties of the Wood Cell Wall

Cited by 9 publications

References 17 publications

Modifying the radiation ratio of tonewoods through wood degradation

Modifying the radiation ratio of tonewoods through wood degradation

Effects of Thermal Treatment on the Mechanical Properties of Bamboo Fiber Bundles

Effects of accelerated weathering test on the properties of larch wood

Contact Info

Product

Resources

About