Study of solutions to optimize the extraction of hemp fibers for composite materials

Grégoire, M.; Luycker, Emmanuel de; Bar, Mahadev; Musio, Salvatore; Amaducci, Stefano; Ouagne, Pierre

doi:10.1007/s42452-019-1332-4

Cited by 13 publications

(4 citation statements)

References 22 publications

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“…Regarding unitary fibers, in spite of their high cellulose content observed during the chemical composition analysis in the section 5.1, the average value for apparent modulus (16.6 ± 8.5 GPa) is in the lower range of the data from the literature (14.4-51 GPa (Bourmaud et al 2018;Gregoire et 2019)), and the average value for the strength (500 ± 239 MPa) is in the middle range of the data available in the literature (285-969 MPa) (Bourmaud et al 2018). The relatively low mechanical properties might be related to the low lignin content measured in our fibers from the Tisza variety compared to the values usually reported for Western European hemp varieties.…”

Section: Tensile Mechanical Properties Of Unitary Fibers and Strandsmentioning

confidence: 62%

“…Prior to the decortication, the straws can undergo a retting process (1) to loosen bonding between fiber-fiber and bundle-bundle by degrading the non-cellulosic components in the bast fiber layer, particularly the pectic polysaccharides (Horne 2020); and (2) to facilitate fiber separation and to avoid fiber breakage during following mechanical processing (e.g. scutching) and to preserve the fibers quality (Gregoire et al 2019). Western European field retting consists of leaving purposefully the stems in the field after the autumn harvest to be decorticated under the actions of microorganisms.…”

Section: Introductionmentioning

confidence: 99%

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Properties of Frost-Retted Hemp Fibers for the Reinforcement of Composites

Marrot

Alao

Mikli

et al. 2021

Journal of Natural Fibers

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Frost-retted hemp fibers were investigated to assess their suitability for composite applications. Chemical analysis of frost-retted hemp fibers highlighted a high amount of solubles (pectins) at the fibers surface and a low lignin content in the fibers that was attributed to an unfavorable synthesis of lignin in the cell wall due to the particularly cold temperature during hemp growth in the Nordic countries. The fibers tensile properties were considered at two different scales and the performances of hemp/PLA composites were assessed. Recommendations were provided for the use of frost-retted hemp fibers in the reinforcement of thermoplastic composites.

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Section: Tensile Mechanical Properties Of Unitary Fibers and Strandsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Properties of Frost-Retted Hemp Fibers for the Reinforcement of Composites

Marrot

Alao

Mikli

et al. 2021

Journal of Natural Fibers

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“…Polar molecules interact with oscillating microwave and radio frequency radiation by undergoing rapid rotations, which generates thermal energy (termed dielectric heating) in proportion to the level of interaction. That enables a degree of selectivity as pectin is more polar than cellulose and thus heats up and is degraded at greater rates (Gregoire et al 2019;Nair et al 2015). Physical separations of the pectin from the cellulose are also likely.…”

Section: Physical Treatmentsmentioning

confidence: 99%

Extraction of cellulose fibers from flax and hemp: a review

2021

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The paper is a review on the extraction processes of cellulosic fibers from flax and hemp. The two lignocellulosic crops have a long history of use by humans for extraction of the bast fibers among other purposes. The utility of bast fibers declined over time with industrial advances and changes to the economy, but of late, with an increase of focus on environmental impact and sustainability, there is a renewed interest in these resources. The use of biomass-based resource requires an appreciation of plant anatomy and the agronomical variables in their cultivation and harvesting. This review provides an overview of these aspects as well as of the processes of retting for initial weakening of the plant structure in preparation for fiber extraction, degumming to isolate fiber bundles, and delignification.

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“…The addition of natural fibers in plaster strengthens the plaster coating and thus enhances ductility. Over the last decades, lignocellulosic or cellulosic fibers derived/extracted from various plants (abaca, coir, cork, flax, hemp, rice straw, and sisal) have been used in plaster mortars/composites [ 6 , 8 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ]. The use of a combination of two natural fibers (kenaf and sisal) for the reinforcement of lime plaster was studied in [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Recycled Cellulose Fiber Reinforced Plaster

et al. 2021

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This paper aims to develop recycled fiber reinforced cement plaster mortar with a good workability of fresh mixture, and insulation, mechanical and adhesive properties of the final hardened product for indoor application. The effect of the incorporation of different portions of three types of cellulose fibers from waste paper recycling into cement mortar (cement/sand ratio of 1:3) on its properties of workability, as well as other physical and mechanical parameters, was studied. The waste paper fiber (WPF) samples were characterized by their different cellulose contents, degree of polymerization, and residues from paper-making. The cement to waste paper fiber mass ratios (C/WPF) ranged from 500:1 to 3:1, and significantly influenced the consistency, bulk density, thermal conductivity, water absorption behavior, and compressive and flexural strength of the fiber-cement mortars. The workability tests of the fiber-cement mortars containing less than 2% WPF achieved optimal properties corresponding to plastic mortars (140–200 mm). The development of dry bulk density and thermal conductivity values of 28-day hardened fiber-cement mortars was favorable with a declining C/WPF ratio, while increasing the fiber content in cement mortars led to a worsening of the water absorption behavior and a lower mechanical performance of the mortars. These key findings were related to a higher porosity and weaker adhesion of fibers and cement particles at the matrix-fiber interface. The adhesion ability of fiber-cement plastering mortar based on WPF samples with the highest cellulose content as a fine filler and two types of mixed hydraulic binder (cement with finely ground granulated blast furnace slag and natural limestone) on commonly used substrates, such as brick and aerated concrete blocks, was also investigated. The adhesive strength testing of these hardened fiber-cement plaster mortars on both substrates revealed lime-cement mortar to be more suitable for fine plaster. The different behavior of fiber-cement containing finely ground slag manifested in a greater depth of the plaster layer failure, crack formation, and in greater damage to the cohesion between the substrate and mortar for the observed time.

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Study of solutions to optimize the extraction of hemp fibers for composite materials

Cited by 13 publications

References 22 publications

Properties of Frost-Retted Hemp Fibers for the Reinforcement of Composites

Properties of Frost-Retted Hemp Fibers for the Reinforcement of Composites

Extraction of cellulose fibers from flax and hemp: a review

Recycled Cellulose Fiber Reinforced Plaster

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