Effect of alkali treatment on microstructure and thermal stability of parenchyma cell compared with bamboo fiber

Chen, Hong; Wu, Jiahui; Shi, Jiangjing; Zhang, Wenfu; Wang, Hankun

doi:10.1016/j.indcrop.2021.113380

Cited by 97 publications

(57 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such unique porous structure with huge lumina has been reported to endow the stalk pith with highly efficient water transportation when used as solar evaporators [ 17 ]. Presence of cavities in cell corners were observed in pith (arrow in Figure 3 b), and similar phenomenon were also observed in bamboo [ 19 ]. Rind is composed of numerous thick-walled fibers with the average lumina diameter of about 10 μm and cell wall thickness of about 2.93 μm.…”

Section: Resultssupporting

confidence: 78%

A Comparative Investigation on Structural and Chemical Differences between the Pith and Rind of Sunflower Stalk and Their Influences on Nanofibrillation Efficiency

et al. 2022

View full text Add to dashboard Cite

The structure and chemical composition of cell walls play a vital role in the bioconversion and utilization of plants. In the present study, the cell wall structure and chemical composition of pith and rind from sunflower stalks were compared and correlated to their nanofibrillation efficiency with ultrasonic treatment. Mild chemical pretreatment using 1% or 4% NaOH without any bleaching process were applied prior to ultrasonication nanofibrillation. Significant structural and chemical differences were demonstrated between the pith and rind, with the former exhibiting a much lower lignin and hemicellulose contents, higher pectin, much looser cell structure and higher cell wall porosity than the latter. Alkaline treatment alone was sufficient to eliminate most of the hemicellulose and pectin from stalk pith, whereas only partial removal of hemicellulose and lignin was achieved for the woody rind part. After 30 min of ultrasonic treatment, the stalk pith exhibited fully defibrillated fibrils with a continuous and entangled micro/nanofibrillated network, whereas numerous micron-sized fiber and fragments remained for the rind. The results indicated that stalk pith is less recalcitrant and easier to be fibrillated with ultrasonication than rind, which must be correlated to their distinct differences in both structure and chemical composition.

show abstract

Section: Resultssupporting

confidence: 78%

A Comparative Investigation on Structural and Chemical Differences between the Pith and Rind of Sunflower Stalk and Their Influences on Nanofibrillation Efficiency

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The lignin condensation and cross-link reactions may contribute to this change. In addition, the increased lignin content played a positive role in the stiffness and strength of bamboo cell walls [ 23 , 30 , 31 , 32 ].…”

Section: Resultsmentioning

confidence: 99%

Study on Bamboo Longitudinal Flattening Technology

et al. 2022

View full text Add to dashboard Cite

In this paper, we introduced a bamboo longitudinal flattening technology and analyzed the effects of the softening–flattening process on the physical and mechanical properties of moso bamboo. This is a newer bamboo processing technology that can enhance the utilization and reduce pollution compared with traditional bamboo-based products. Results showed that the parenchyma cells distorted and compacted due to the flattening process. The hemicellulose and cellulose content decreased, while the content of lignin presented an increasing tendency. As expected, the dimensional stability of moso bamboo enhanced due to the decrement of hemicellulose. The softening–flattening process positively contributed to the micro-mechanical properties of treated bamboo specimens. For example, the hardness and modulus of elasticity of the untreated bamboo sample increased from 0.58 and 15.7 GPa to 0.8 and 17.5 GPa, respectively. In addition, the changes in cellulose crystallinity and mechanical properties were also investigated in this paper. The cellulose crystallinity increased from 37.5% to 43.2%, significantly. However, the modulus of rupture of the flattened bamboo board decreased from 9000 to 7500 MPa due to the grooves made by the flattening roller. The MOE of flattening bamboo board showed the same decreasing tendency.

show abstract

“…Even though the chemical treatment with more than 15% of NaOH will damage the fiber under hydrolytic condition. [29] When compared to other natural fibers, jute and hemp fibers have a relatively high strength and fiber length. Hemp fiber has an average diameter of 30-50 μm, tensile strength of 270-735 MPa, and tensile modulus of 19-45 GPa, according to reports.…”

Section: Introductionmentioning

confidence: 99%

“…Even though the chemical treatment with more than 15% of NaOH will damage the fiber under hydrolytic condition. [ 29 ]…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on physical, mechanical, and thermal properties of jute and hemp fibers reinforced hybrid polylactic acid composites

2022

View full text Add to dashboard Cite

Nowadays researchers seeking attention on plant‐based natural fibers as reinforcement with the biodegradable matrix‐like polylactic acid (PLA) to solve the environmental issues. In this research work, jute and hemp fibers are reinforced with PLA matrix with the weight fraction of 50:50 and the composites are fabricated by using compression molding technique. The properties such as hardness, tensile strength, flexural strength, impact strength and inter‐laminar shear strength (ILSS), and water absorption characteristics are evaluated. The characterization of these composites are examined by using thermo‐gravimetry analysis, differential thermal analysis, differential thermo‐gravimetric, and scanning electron microscopy analysis. Experimental results show that the jute/hemp/PLA hybrid composites exhibit better tensile strength (69 MPa), flexural strength (145.40 MPa), impact strength (6.37 J), and ILSS (2.98 MPa) than other combinations. From the thermal analysis it is found that the decomposition and weight loss occurring started around 250°C and ended by 350°C. From the experimental analysis it is concluded that the hybrid composites performed well, indicating that they have a lot of potential for use as a green substitute material for synthetic or single plant fiber reinforced composites.

show abstract

Effect of alkali treatment on microstructure and thermal stability of parenchyma cell compared with bamboo fiber

Cited by 97 publications

References 38 publications

A Comparative Investigation on Structural and Chemical Differences between the Pith and Rind of Sunflower Stalk and Their Influences on Nanofibrillation Efficiency

A Comparative Investigation on Structural and Chemical Differences between the Pith and Rind of Sunflower Stalk and Their Influences on Nanofibrillation Efficiency

Study on Bamboo Longitudinal Flattening Technology

Experimental investigation on physical, mechanical, and thermal properties of jute and hemp fibers reinforced hybrid polylactic acid composites

Contact Info

Product

Resources

About