Chemical Structure and Mechanical Properties of Wood Cell Walls Treated with Acid and Alkali Solution

Xu, Enguang; Wang, Dong; Lin, Lanying

doi:10.3390/f11010087

Cited by 63 publications

(41 citation statements)

References 31 publications

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“…Lignin is less sensitive to alkali than hemicellulose and therefore requires higher NaOH concentration and longer soak time to be removed from the fiber matrix [ 41 , 42 , 46 , 47 ]. The removal of the lignin and hemicellulose in the wood fiber decreases the distance between the microfibrils and causes microfibril aggregation in the fiber, which results in increased cellulose crystallinity and crystallite size [ 53 ], and these factors contributes to improved fiber strength [ 53 ]. According to previous research, high NaOH concentration (>10%) or longer treatment time (>6 h) caused partial dissolution of cellulose crystalline region and resulted in weakened mechanical properties [ 53 , 54 ].…”

Section: Resultsmentioning

confidence: 99%

“…Unlike RC fiber, HS fiber had improved toughness after alkali treatment (2% 1 h), which may be due to a mild alkali treatment removing partial lignin and hemicellulose and improving the molecular mobility of the cellulose chains but not significantly increasing the cellulose crystallinity. As a result, the ability of the fiber to absorb energy under stretching, i.e., modulus of toughness, was improved [ 53 , 54 ].…”

Section: Resultsmentioning

confidence: 99%

“…The removal of the lignin and hemicellulose in the wood fiber decreases the distance between the microfibrils and causes microfibril aggregation in the fiber, which results in increased cellulose crystallinity and crystallite size [53], and these factors contributes to improved fiber strength [53]. According to previous research, high NaOH concentration (>10%) or longer treatment time (>6 h) caused partial dissolution of cellulose crystalline region and resulted in weakened mechanical properties [53,54]. RC fiber modulus (Figure 5B) decreased up on alkali treatment and is similar to that of the NaOH-treated oil palm empty fruit bunch fiber (~265 MPa) [51].…”

Section: Alkali Treatment Improved Fiber Tensile Strengthmentioning

confidence: 99%

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Value-Added Use of Invasive Plant-Derived Fibers as PHBV Fillers for Biocomposite Development

et al. 2021

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Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) is a promising biobased, biodegradable thermoplastic with limited industrial applications due to its brittleness and high cost. To improve these properties, lignocellulosic fibers from two invasive plants (Phalaris arundinacea and Lonicera japonica) were used as PHBV reinforcing agents. Alkali treatment of the fibers improved the PHBV–fiber interfacial bond by up to 300%. The morphological, mechanical, and thermal properties of the treated fibers were characterized, as well as their size, loading, and type, to understand their impact on performance of the biocomposites. The new biocomposites had improved thermal stability, restricted crystallization, reduced rigidity, and reduced cost compared with PHBV. Additionally, these novel biocomposites performed similarly to conventional plastics such as polypropylene, suggesting their potential as bio-alternatives for industrial applications such as semirigid packaging and lightweight auto body panels.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Alkali Treatment Improved Fiber Tensile Strengthmentioning

confidence: 99%

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Value-Added Use of Invasive Plant-Derived Fibers as PHBV Fillers for Biocomposite Development

et al. 2021

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“…Deligni cation with NaClO 2 initially proceeds from the lignin-rich CML during the early stages of the reaction and selectively softens the CML region. Then, the reaction and softening of the cell wall progresses during the later stages of the reaction (Xu et al 2020). The results of T 1 H in this study (Fig.…”

Section: In Uence Of Lignin On Plastic Ow Deformation Of Woodmentioning

confidence: 99%

Influence of Lignin On Plastic Flow Deformation of Wood

Seki

Abe²,

Miki

et al. 2021

Preprint

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In this study, we clarified the influence of lignin in wood on its plastic flow deformation due to shear sliding of wood cells. Wood samples were subjected to delignification, where the lignin structure gradually changed, and characterized for their chemical and physicochemical properties, and deformability by free compression testing. The delignified wood deformed by efficient stretching and maintained its cell structures at a lower pressure compared to the untreated wood. The deformability was evaluated from two viewpoints: the initial resistance to plastic flow and final stretchability. The deformability of the delignified and untreated wood increased with increasing compressive temperature, even though the changes in molecular motility associated with the glass transition of lignin contributed minimally to the improvement in deformability. In the early stages of delignification, the molecular mass of lignin in the compound middle lamella decreased, which reduced the initial resistance to plastic flow. However, during the early stages of delignification, the stretchability of delignified wood was scarcely affected by changes in lignin. As the amount of lignin was further reduced and delignification proceeded in the vicinity of the polysaccharides, the stretchability significantly improved. The correlation between chemical and physicochemical properties and plastic flow deformability presented in this paper will be helpful for low-energy and highly productive forming of solid-state wood.

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“…On the downside, the fiber binding force is not as good as with chemical pulp, leading to lower physical strength which hinders its application for several end-uses [7]. Chemical-mechanical pulp has the advantages of high yields, low costs and superior pulp properties [8]. Therefore, various methods have been utilized in the improvement of mechanical pulp, such as mild chemical, enzymatic and biological pretreatments [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ozone Treatment on the Properties of Oil Palm Empty Fruit Bunch Sulfonated Chemi-Mechanical Pulp

Wan

Yang

2021

Forests

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Oil palm empty fruit bunch (EFB) as an abundant waste material can be utilized for pulp production to alleviate the shortage of raw materials in the paper industry. Sulfonated chemi-mechanical pulp (SCMP) has great potential in paper making industry. However, its poor performance due to the high surface lignin content limits its application. In this study, we used EFB as raw material to produce SCMP and systematically studied the effect of ozone treatment on pulp properties. Results show that the surface structure and morphology of fibers exhibited distinct differences under different ozone dosage treatments. Compared to the control, the content of surface lignin of pulps was reduced by 2.56%, 4.64%, 13.24% and 25.24% when ozone consumption was 1, 3, 5 and 7 wt%, respectively. Meanwhile, the treated pulp had a lower drainability at the same refining energy level. Moreover, the physical and optical properties of handsheets were improved significantly after ozone treatment. Ozone treatment is a very efficient way to improve the performance of SCMP. Additionally, this method avoids complicated processes and chemical consumption. Therefore, as an effective, environmentally friendly and low-cost treatment method, ozone treatment can improve the performance of EFB SCMP and thus provide a high-quality pulp resource.

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Chemical Structure and Mechanical Properties of Wood Cell Walls Treated with Acid and Alkali Solution

Cited by 63 publications

References 31 publications

Value-Added Use of Invasive Plant-Derived Fibers as PHBV Fillers for Biocomposite Development

Value-Added Use of Invasive Plant-Derived Fibers as PHBV Fillers for Biocomposite Development

Influence of Lignin On Plastic Flow Deformation of Wood

Effect of Ozone Treatment on the Properties of Oil Palm Empty Fruit Bunch Sulfonated Chemi-Mechanical Pulp

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