Water Absorption Behavior of Hemp Hurds Composites

Števulová, Nadežda; Cigasova, Julia; Purcz, Pavol; Schwarzova, Ivana; Kačík, František; Geffert, Anton

doi:10.3390/ma8052243

Cited by 62 publications

(38 citation statements)

References 33 publications

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“…Different treatments on sisal fibers reduced the diffusion coefficient and similar to the ONPF composites, the diffusion coefficient increased with the fiber content and decreased when fiber treatments were applied [34]. This was also noticed in other studies that studied the relation between water sorption behavior and fiber chemical composition [58].…”

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confidence: 77%

Impact Properties and Water Uptake Behavior of Old Newspaper Recycled Fibers-Reinforced Polypropylene Composites

et al. 2020

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Natural fiber-reinforced thermoplastic composites can be an alternative to mineral fiber-based composites, especially when economic and environment concerns are included under the material selection criteria. In recent years, the literature has shown how lignocellulosic fiber-reinforced composites can be used for a variety of applications. Nonetheless, the impact strength and the water uptake behavior of such materials have been seen as drawbacks. In this work, the impact strength and the water uptake of composites made of polypropylene reinforced with fibers from recycled newspaper have been researched. The results show how the impact strength decreases with the percentage of reinforcement in a similar manner to that of glass fiber-reinforced polypropylene composites as a result of adding a fragile phase to the material. It was found that the water uptake increased with the increasing percentages of lignocellulosic fibers due to the hydrophilic nature of such reinforcements. The diffusion behavior was found to be Fickian. A maleic anhydride was added as a coupling agent in order to increase the strength of the interface between the matrix and the reinforcements. It was found that the presence of such a coupling agent increased the impact strength of the composites and decreased the water uptake. Impact strengths of 21.3 kJ/m 3 were obtained for a coupled composite with 30 wt % reinforcement contents, which is a value higher than that obtained for glass fiber-based materials. The obtained composites reinforced with recycled fibers showed competitive impact strength and water uptake behaviors in comparison with materials reinforced with raw lignocellulosic fibers. The article increases the knowledge on newspaper fiber-reinforced polyolefin composite properties, showing the competitiveness of waste-based materials.In the case of the ONPF composites, the mixer was operated at 80 rpm and 180 °C . The mixing lasted 178 10 min. The coupled GF-reinforced composites were mixed at 20 rpm due to the fragility of such 179 reinforcements. All the resulting melts were pelletized in a knife mill. Prior to its mold injection, the 180 pellets were dried during 1 h in a stove at 80 °C . 181Standard rectangular specimens measuring 62 × 13 mm, with a thickness of 3.2 mm, in 182 agreement with ASTM D638 [44] were mold injected. The injection molding machine was a Meteor 183 40 by Mateu&Solé (Barcelona, Spain). The machine has three heating areas, which were operated at 184 175, 175, and 190 °C , of which the last was the injection nozzle. The first and second pressures were 185 120 and 37.5 kgf/cm 2 , respectively. At least seven valid specimens for any of the composite 186 formulations were mold injected. Five were devoted to the impact test and two were devoted to water 187 uptake analysis. 188 2.4. Specimens Testing 189 Impact strength was carried out in agreement with the ISO 179-1:2010 standard [45]. Un-notched 190 specimens were placed in a Charpy test equipment Instron Ceast 5.5 Resil by Ceast S.p.a. (Pianezza,

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confidence: 77%

Impact Properties and Water Uptake Behavior of Old Newspaper Recycled Fibers-Reinforced Polypropylene Composites

et al. 2020

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“…The use of hemp hurd as a filler in polymer matrix composites is not entirely new and previous research has shown that properties comparable to the ones obtained using wood flour as a filler (Cigasova et al, n.d.;Khan et al, 2015;Kidalova et al, 2015;Stevulova et al, 2015) can be achieved. As shown in Table 1, the chemical composition of hemp hurd is comparable to wood four.…”

Section: Introductionmentioning

confidence: 99%

Hemp hurd flour as an alternative low cost filler in wood plastic composites

Heitzmann¹,

Ali²,

Legras³

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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Hemp hurd, also commonly referred to as hemp shives, is a low cost byproduct from the decortication process of hemp, retailing for less than 0.2 $/kg. In the context of establishing a hemp agri-fibre operation, value adding to this underutilized waste stream is crucial to improve the overall economics of the operation. In this research the use of hemp hurd as an alternative to wood flour for the production of wood plastic composites is investigated. Hemp hurd filled Polypropylene composites were produced via compounding in a co-rotating twin screw extruder. Taguchi design of experiment methodology in combination with Analysis of Means (ANOM) was used to gain an understanding of the influence of the different processing parameters. Parameters investigated were screw-configuration, temperature profile and fibre loading. Best results were obtained with a relatively gentle mixing zone at a temperature of 200 ⁰C and 40%wt. and 20%wt. of fibre loading for highest stiffness and highest strength respectively.

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“…It was observed that the jute fabric-reinforced composites absorbed water very rapidly at the initial stage, and later a saturation level was attained without any further increase in water sorption. It is known that factors such as porosity content and fabric-matrix adhesion are responsible for the moisture absorption behavior of natural fabric composites (Stevulova et al 2015). In these cases, the hydrophilicity of jute fabric, voids contents, and fabric-matrix adhesion might affect the moisture uptake of the composites.…”

Section: Water Absorption Propertiesmentioning

confidence: 99%

Effect of Chemical Treatments on the Physical Properties of Non-woven Jute/PLA Biocomposites

Khan¹,

Shaikh²,

Alam³

et al. 2015

BioResources

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Biocomposites based on poly(L-lactic acid) (PLA) and non-woven jute fabrics (NWJF) were fabricated by sandwiching non-woven jute mat between PLA sheets. First, composites were fabricated with various weight proportions of jute fabric (5, 10, 20, and 30 wt.%) with the PLA matrix, and the effect of fabric loading on their mechanical properties was investigated. Higher mechanical properties were found at 10 wt.% fabricloaded composite. The results show that the tensile, flexural, and impact strengths were increased by 61.7, 52.3, and 47.2%, respectively, as compared with neat PLA. In the second part, the jute fabrics were chemically treated with NaOH, NaClO2, acrylonitrile, acetic anhydride, KMnO4, diphenylmethane diisocyanate, and benzoyl chloride. The effect of chemical treatment on the mechanical and water absorption properties of NWJF/PLA biocomposites was studied. The mechanical properties of these biocomposites were found to be higher than those of untreated biocomposites. Among all the treatments, the combined alkalibenzoylated-treated fabric composite showed higher mechanical properties. The water absorption properties of these composites were found to be remarkably lower than those of untreated fibers. The interfacial adhesion between the fiber and the matrix was shown to increase with surface modification as revealed by SEM analysis.

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Water Absorption Behavior of Hemp Hurds Composites

Cited by 62 publications

References 33 publications

Impact Properties and Water Uptake Behavior of Old Newspaper Recycled Fibers-Reinforced Polypropylene Composites

Impact Properties and Water Uptake Behavior of Old Newspaper Recycled Fibers-Reinforced Polypropylene Composites

Hemp hurd flour as an alternative low cost filler in wood plastic composites

Effect of Chemical Treatments on the Physical Properties of Non-woven Jute/PLA Biocomposites

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