Experimental and numerical investigations on the effect of alkaline hornification on the hydrothermal ageing of Agave natural fiber composites

Jain, Deepak; Kamboj, Ishita; Bera, Tarun Kumar; Kang, Amardeep Singh; Singla, Rohit

doi:10.1016/j.ijheatmasstransfer.2018.10.106

Cited by 39 publications

(13 citation statements)

References 22 publications

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“…On the other hand, as expected, treated agave fibres show a reduction in hemicellulose content to almost half of the original content, also with a slight reduction in lignin; this leads to the increase in cellulose content, reaching almost 80% of the fibre. This same behaviour is found in the literature, with cellulose ratios in NaOH treated fibres reaching over 85% [19,27]. It is also interesting to take into account that alkali treatment can transform crystallinity of the cellulose in the fibres, and also the type of cellulose found; El Oudiani found the highest crystallinity for 2% NaOH-treated fibres, while the highest shift from cellulose I to cellulose II happened for 10-15% NaOH solutions, leading higher concentrations to cellulose degradation [35].…”

Section: Fibre Characterizationsupporting

confidence: 89%

“…The chopped fibres were treated with NaOH 1 N at room temperature for 1 h, followed by washing with distillate water until neutral pH was achieved; the treated fibre was characterized by the procedures already mentioned. NaOH treatment is a very common method in literature to reduce hemicellulose [25,26], lignin and other compounds [19,27] in natural fibres, as well as to reduce their hydrophilic character and water absorption [16,17,27].…”

Section: Fibre Obtaining and Characterizationmentioning

confidence: 99%

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Characterization of Agave americana L. plant as potential source of fibres for composites obtaining

et al. 2019

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This paper summarises the results obtained from the characterization assays from century plant (Agave americana L.), determining the chemical composition of different parts of the plant. Fibres were obtained by means of a mechanical device, specifically designed and built for Agave americana leaves processing. Obtained fibres were subjected to thermogravimetric analysis and infrared spectra, and their chemical composition was also determined by quantitative acid hydrolysis. Once obtained, fibres were blended up to 40% (in weight) to obtain composites by compression moulding, using polyethylene as matrix; mechanical testing show improvements in elastic modulus for both tensile and flexural tests; increase in flexural maximum strength were also found for the composites, while tensile strength is slightly reduced with the introduction of agave fibres. The research is part of a project developed in the Macaronesian region, which aim is to demonstrate the feasibility of using biomass from invasive plant species in the composites sector as a way of financing control campaigns and habitats conservation labours, which is the main novelty of this research.

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Section: Fibre Characterizationsupporting

confidence: 89%

Section: Fibre Obtaining and Characterizationmentioning

confidence: 99%

Characterization of Agave americana L. plant as potential source of fibres for composites obtaining

et al. 2019

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“…It has been reported that water molecules absorbed onto the hydrophilic groups of the plant fiber form a large number of hydrogen bonds, which create a physical barrier between the fiber and the matrix, leading to weakening of the interface adhesion and fiber debonding [ 54 , 55 , 56 ]. Generally, the increase in fiber moisture content results in reduced modulus of elasticity and strength, accompanied by the formation of large voids in the final composites and a predominant fiber pullout failure mode [ 44 , 57 , 58 ].…”

Section: Interfacial Adhesion Between Plant Fibers and Cement And mentioning

confidence: 99%

“…to weakening of the interface adhesion and fiber debonding [54][55][56]. Generally, the increase in fiber moisture content results in reduced modulus of elasticity and strength, accompanied by the formation of large voids in the final composites and a predominant fiber pullout failure mode [44,57,58].…”

Section: Effect Of Plant Fiber Moisture On Compositesmentioning

confidence: 99%

A Review on Natural Fiber-Reinforced Geopolymer and Cement-Based Composites

et al. 2020

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The use of ecological materials for building and industrial applications contributes to minimizing the environmental impact of new technologies. In this context, the cement and geopolymer sectors are considering natural fibers as sustainable reinforcement for developing composites. Natural fibers are renewable, biodegradable, and non-toxic, and they exhibit attractive mechanical properties in comparison with their synthetic fiber counterparts. However, their hydrophilic character makes them vulnerable to high volumes of moisture absorption, thus conferring poor wetting with the matrix and weakening the fiber–matrix interface. Therefore, modification and functionalization strategies for natural fibers to tailor interface properties and to improve the durability and mechanical behavior of cement and geopolymer-based composites become highly important. This paper presents a review of the physical, chemical and biological pre-treatments that have been performed on natural fibers, their results and effects on the fiber–matrix interface of cement and geopolymer composites. In addition, the degradation mechanisms of natural fibers used in such composites are discussed. This review finalizes with concluding remarks and recommendations to be addressed through further in-depth studies in the field.

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“…23 The alkali treatment is highlighted, promoting the lignin and wax removal and increasing the cellulose hydroxyls availability. 24 Table 2 shows the chemical composition of different palm species commonly covered in the literature:…”

Section: Introductionmentioning

confidence: 99%

Revaluation of Australian palm residues in polypropylene composites: Statistical influence of fiber treatment

Zanini

Barbosa

Souza

et al. 2020

Journal of Composite Materials

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Australian palm residues are generated by palm heart industry in large quantities and are considered an underused material with a composition rich in lignocellulosic structures. This residue is generally utilized as briquettes for energy or sheep feed; however, few works investigate this residue as composite fillers. This work aimed to revalue Australian palm residues (PR) by preparing polypropylene composites through melt mixing, using different fiber contents (0, 5, 10, 20, and 30 wt%), and evaluate the statistical influence of fibers (residues) alkali treatment (MPR) in composites mechanical properties. PR and MPR were evaluated by FTIR, XRD, SEM, TGA, and composites were assessed using thermal and mechanical analysis, in which ANOVA statistical analysis was applied. The residues addition increased the mechanical properties and their treatment enhanced the stiffness of the composites compared to pristine PP. However, ANOVA demonstrated that at low residues contents, surface treatment does not increase fiber-matrix interactions effectively, then tensile properties were statistically similar to PP. Considering tensile properties, 20% MPR showed statistically distinct properties, with significative enhancements; no filler contents dependence was verified. Flexural properties were more sensitive to residue loading, and composites with 30% PR and MPR presented superior mechanical performance. This difference is associated with a higher sensitivity of tensile stress towards fiber-matrix interactions, which was improved with fiber treatment. Also, the residues content and treatment influenced the composites' thermal stability, with better results for PP-MPR. Results indicate that palm residue is an excellent filler for improving composites' thermal and mechanical properties, with a greener character.

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Experimental and numerical investigations on the effect of alkaline hornification on the hydrothermal ageing of Agave natural fiber composites

Cited by 39 publications

References 22 publications

Characterization of Agave americana L. plant as potential source of fibres for composites obtaining

Characterization of Agave americana L. plant as potential source of fibres for composites obtaining

A Review on Natural Fiber-Reinforced Geopolymer and Cement-Based Composites

Revaluation of Australian palm residues in polypropylene composites: Statistical influence of fiber treatment

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