Influence of Water Amount and Immersion Time on the Sisal Fibers Hornification Process

Mendes, Sophia Franciscani; Hugen, Lisiane Nunes; Santos, Renan Duarte dos; Filho, Romildo Dias Toledo; Ferreira, Saulo Rocha

doi:10.1080/15440478.2019.1697990

Cited by 13 publications

(5 citation statements)

References 28 publications

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“…This would affect the mobility of molecules and lead to a higher degree of molecular organization (Joutsimo and Giacomozzi 2015). The horni cation process creates new, unbreakable hydrogen bonds in the ber wall structure, which reduce the space available for the water molecule (Claramunt et al 2011, Mendes et al 2021). The borax treatment increased the accessibility of the water molecule to the cellulosic ber surface, resulting in an increased opportunity for hydrogen bonding to form during the recycling process.…”

Section: Resultsmentioning

confidence: 99%

Investigating the effects of boron compounds on the cellulose fiber performance in paper recycling process

Şahin,

Bozkurt,

Çiçekler

2024

Chem. Pap.

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This study aimed to investigate the effects of boron compounds on cellulose bers during recycling.Three recycling stages were conducted, applying boric acid and borax to bleached papers. Physical, mechanical, and optical properties were measured after each process. The highest water absorption (218 g/m 2 ) was observed in test papers from the second recycling stage using 10% borax-treated pulps (10Bx2). Boric acid treatment notably improved burst strength, with the highest value (3.94 kPa m 2 /g) in the rst recycling stage with 5.0% boric acid treatment (5Ba1). The highest tensile strength (49.48 Nm/g) occurred in the rst recycling stage with 5.0% boric acid treatment, while the lowest (17.41 Nm/g) was in the second recycling stage (5Bx2) with 5.0% borax treatment. Tear strength exhibited different trends from burst and tensile strength, with notable improvements using 5.0% and 10% boric acid and 10% borax treatments on recovered cellulose bers. The highest tear strength (9.20 Nm 2 /g) was achieved with 5.0% boric acid treatment (5Ba2) in the second recycling stage, followed by 8.21 Nm 2 /g with 10% boric acid treatment (10Ba1) in the rst recycling stage. Tear strength trends differed from burst and tensile strength properties, regardless of treatment conditions.

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Section: Resultsmentioning

confidence: 99%

Investigating the effects of boron compounds on the cellulose fiber performance in paper recycling process

Şahin,

Bozkurt,

Çiçekler

2024

Chem. Pap.

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“…24 Further, alkali and water hornification techniques have both been utilized to successfully increase the mechanical strength and durability of several plant-based natural fibres. 8,25 However, the authors observed that there doesn’t exist any significant work in literature which highlight the effect of hornification on the hygromechanical behaviour of stubble straw to explore its potential applications.…”

Section: Introductionmentioning

confidence: 99%

The effect of the cyclic hornification on the hygromechanical and surface characteristics of rice stubble agriculture waste

Somal,

Jain,

Bhowmick

2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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An indiscriminate burning of rice stubble waste in the farms poses a major environmental challenge worldwide. The stubble waste can be utilized to fabricate the natural fibre polymer composites for several mild- to low-load-bearing applications in the civil construction. However, the susceptibility to long-term environmental moisture limits the use of stubble waste. In this work, we analyse the effect of water and alkali hornification as a pre-treatment technique on the moisture uptake, surface roughness, wettability and mechanical strength of rice stubble straw, and the results are compared with untreated stubble straw. The water retention value was reduced by ∼49% and ∼60% after four hornification cycles under the water and alkali mediums, respectively. Preliminary visual and microstructural assessments revealed the reduction in hydrophilic cellulose and lignin contents with both types of pre-treatments. It is observed that in comparison to alkali hornification, the water hornification technique leads to a significant improvement in hygromechanical characteristics of stubble straw. When compared to untreated stubble, one cycle of water hornification leads to approximately ∼16% reduction in the moisture uptake, and ∼42% increase in the tensile strength. On the other hand, the alkali hornification resulted in the improvement in tensile strength by ∼36%, but it led to an increased water uptake. The results indicated that the thinning and surface roughening of the fibres is primarily caused by the removal of amorphous contents during the pre-treatment. For an improved environmental durability with better mechanical strength, it is recommended to do the pre-treatment of the stubble waste using one water hornification cycle before it is used further.

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“…Fiber qualities would undergo an irreversible decline when recycled paper ber was exposed to cycles of wetting and drying. In detail, the morphology of the cellulosic ber had changed during the recycling process (Mendes et al, 2019), bers trended to aggregate and formed a more compact structure (Ponni et al, 2012). The amorphous area of the ber was more easily degraded, and relatively, the crystallinity became larger, which made it more di cult to disperse into a single ber.…”

Section: Introductionmentioning

confidence: 99%

“…The amorphous area of the ber was more easily degraded, and relatively, the crystallinity became larger, which made it more di cult to disperse into a single ber. The term "horni cation" aptly described this phenomenon, the degree to which bers were irreversibly combined when they were dried or rewet (Cid et al, 2020;Mendes et al, 2019;Yang and Berglund, 2020). High-strength beating was intended to disperse the bers as much as possible (Chen et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Effects of Hemicellulose on Recycling Performance of Paper Based on Sisal Fibers

Qin¹,

Chen²,

Sheng³

et al. 2021

Preprint

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The pulp and paper industry growingly paid attention to the recycling and maintenance of waste paper products. Each paper-making cycle would lead to a sharp drop in the mechanical properties of the cellulosic paper, which was related to the hornification effect. Here, the recycling performance of the holocellulose paper was studied, compared with that of the cellulosic paper. Holocellulose fibers from sisal were fabricated by a gentle delignification method, and the well-preserved cellulose and hemicellulose components hindered the cocrystallization and aggregation of cellulose fibril. Holocellulose paper exhibited much more favorable recycling properties, compared with cellulosic paper. After 5 runs of recycling, holocellulose paper still shown an ultimate strength as high as 25 MPa (reduced from 35 MPa), a decrease of 27.1 %. However, cellulosic paper experienced a substantial loss in ultimate strength from 35 MPa to 9 MPa, a decrease of about 74 %. This can be attributed to the core-shell structure from cellulose and hemicellulose to weaken the hornification effect.

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Influence of Water Amount and Immersion Time on the Sisal Fibers Hornification Process

Cited by 13 publications

References 28 publications

Investigating the effects of boron compounds on the cellulose fiber performance in paper recycling process

Investigating the effects of boron compounds on the cellulose fiber performance in paper recycling process

The effect of the cyclic hornification on the hygromechanical and surface characteristics of rice stubble agriculture waste

Effects of Hemicellulose on Recycling Performance of Paper Based on Sisal Fibers

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