scholarly journals Mechanical properties of the fiber cell wall in Bambusa pervariabilis bamboo and analyses of their influencing factors

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 5316-5327
Author(s):  
Bo Zhang ◽  
Yihan Guo ◽  
Xing'e Liu ◽  
Huiyu Chen ◽  
Shumin Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Wall ◽  
Microfibril Angle ◽  
Fiber Cell ◽  
X Ray Diffraction ◽  
Important Indicator ◽  
Different Ages ◽  
Bamboo Fibers ◽  
Fiber Cell Wall ◽  
Cell Wall Mechanics

The cell wall mechanical properties are an important indicator for evaluating the overall mechanical properties of natural bamboo fibers. Using the nanoindentation technique, the variation of the mechanical properties of the fiber cell wall of Bambusa pervariabilis culms with different ages and different positions (both radial and longitudinal) was studied. Moreover, x-ray diffraction (XRD) was employed to measure the microfibril angle (MFA), and the correlation between the MFA and the mechanical properties of the fiber cell wall. The results showed that there was a remarkable difference in the fiber cell wall mechanical properties at different ages and at different radial and longitudinal positions. However, at different ages and at different positions, the absolute value of variation of MFA was less than 1° and was very minor. Furthermore, there was no significant correlation between the fiber cell wall mechanics and MFA, indicating that the mechanical property of the fiber cell walls might be synergistically affected by many factors.

Wood mechanical properties and their correlation with microstructure in Chinese fir clones

IAWA Journal ◽  
2021 ◽  
pp. 1-10
Author(s):  
Yurong Wang ◽  
Ru Jia ◽  
Haiyan Sun ◽  
Yamei Liu ◽  
Jianxiong Lyu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Wall ◽  
Linear Regression Analysis ◽  
Microfibril Angle ◽  
Chinese Fir ◽  
Modulus Of Rupture ◽  
X Ray Diffraction ◽  
Average Cell ◽  
X Ray ◽  
Two Factors

Abstract Mechanical testing, microscopic image analysis, and X-ray diffraction were used to study the mechanical properties and their correlation with microstructure in three 20-year-old Chinese fir clones (Kailin 24, Kaihua 13, and Kaihua 3). The Chinese fir clones featured a modulus of rupture (MOR) of 52–59 MPa, a modulus of elasticity (MOE) of 10–11 GPa, and a compressive strength parallel to the grain of 31–34 MPa. Kaihua 13 and Kailin 24 had similar mechanical properties and were superior to Kaihua 3 among the tree clones. Radial variation indicated that their outerwood (rings 9–18) had better mechanical properties than their corewood (rings 3–7). Kaihua 13 with better mechanical properties had a larger ratio of cell wall to lumen than Kaihua 3 and Kailin 24. Outerwood with better mechanical properties also had a larger ratio of cell wall to lumen and a smaller microfibril angle compared to corewood with poor mechanical properties. Linear regression analysis also shows that for various clones and different radial positions in the same clone, anatomical structure parameters such as average cell wall thickness and the ratio of cell wall to lumen were positively correlated to their mechanical properties, while the microfibril angle was negatively correlated to mechanical properties. The two factors synergistically influence the mechanical properties of wood.

scholarly journals Microstructure Transformation In Palm-Fiber Cell Wall And Its Influence On the Fiber's Mechanical Properties During Alkali Treatment

2021 ◽  
Author(s):  
Lingxiao Jing ◽  
Ying Jiang ◽  
Penghu Deng ◽  
Yuehan Wang ◽  
Yifa Ma ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Wall ◽  
Tensile Properties ◽  
Alkali Treatment ◽  
Laser Scanning Microscopy ◽  
Fiber Cell ◽  
Palm Fiber ◽  
Microstructure Transformation ◽  
Treatment Research ◽  
Fiber Cell Wall

Abstract In this study, we examined the microstructure transformation of palm fiber and the influence of this transformation on the fiber mechanical properties during alkali treatment. The fibers were treated with different concentrations of NaOH to study the change rules of the microstructure and the tensile properties. FT-IR microspectroscopic imaging and confocal laser scanning microscopy were adopted to observe microstructure transformation during alkali treatment. Research results showed that the hemicellulose and lignin in the fiber cell wall were removed by alkali treatment, leading to a rearrangement of cellulose chains. The tensile properties palm fibers were significantly improved because of crystallinity alterations in the cell walls after alkali treatment. This study might provide a basis for palm fiber’s high-value utilization in the field of materials.

Mercerization and Characterization of Straw Pulp Fibers

2013 ◽  
Vol 781-784 ◽  
pp. 2645-2649
Author(s):  
Yan Na Yin ◽  
Quan Xiao Liu ◽  
Yu Bin Lyu
Keyword(s):  
Cell Wall ◽  
Processing Time ◽  
Water Retention ◽  
Fiber Cell ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Treatment Conditions ◽  
Fiber Cell Wall

Effects of mercerizing treatment on water-retention value of straw pulp fibers were discussed and the mercerizing treatment conditions were optimized. The best conditions of mercerizing treatment is NaOH concentration of 4mol/L, temperature of 40°C and processing time of 60min. SEM showed that the fiber cell wall swelling increase after mercerization.

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