Improving the performance of hemp hurd/polypropylene composites using pectinase pre-treatments

Xiao-ping, LI; Morrell, Jeffery J.; Zhou, Xiaojian; Du, Guanben

doi:10.1016/j.indcrop.2016.12.061

Cited by 28 publications

(15 citation statements)

References 14 publications

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“…Literature survey shows that the bers are preferentially selected due to the geographic location. For example hemp bers are mainly used in composites made in France, 2,[22][23][24] China, 25 New Zealand, [26][27][28][29][30] United States of America, 31,32 Canada, 33 Morocco 34 or even Romania. 35 Because main hemp producers are located in European Union 36 (especially in France 37 ), China, Australia, New Zealand, Canada and USA.…”

Section: Grades and Sourcing Of Bers At The Global Scalementioning

confidence: 99%

Lignocellulosic fibers: a critical review of the extrusion process for enhancement of the properties of natural fiber composites

et al. 2017

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Section: Grades and Sourcing Of Bers At The Global Scalementioning

confidence: 99%

Lignocellulosic fibers: a critical review of the extrusion process for enhancement of the properties of natural fiber composites

et al. 2017

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“…Such effects on deformation and strength properties are explained by the presence of MAPP favoring the bond formation between PP and cotton fibers, which consequently improves the stress transfer at the interfacial boundary when the material is subjected to load. Additionally, MAPP may also contribute to the water barrier properties of the composite material by reducing the availability of hydroxyl groups [53]. It is concluded that MAPP may not be necessary to increase the flexural modulus of the composite, though, its addition may add a competitive advantage over uncoupled composites in terms of strength, deformation capacity, and water barrier properties.…”

Section: Analysis Of the Flexural Modulusmentioning

confidence: 99%

Exploring the Potential of Cotton Industry Byproducts in the Plastic Composite Sector: Macro and Micromechanics Study of the Flexural Modulus

et al. 2021

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The textile sector produces yearly great quantities of cotton byproducts, and the major part is either incinerated or landfilled, resulting in serious environmental risks. The use of such byproducts in the composite sector presents an attractive opportunity to valorize the residue, reduce its environmental impact, and decrease the pressure on natural and synthetic resources. In this work, composite materials based on polypropylene and dyed cotton byproducts from the textile industry were manufactured. The competitiveness of the resulting composites was evaluated from the analyses, at macro and micro scales, of the flexural modulus. It was observed that the presence of dyes in cotton fibers, also a byproduct from the production of denim items, notably favored the dispersion of the phases in comparison with other cellulose-rich fibers. Further, the presence of a coupling agent, in this case, maleic anhydride grafted polypropylene, enhanced the interfacial adhesion of the composite. As a result, the flexural modulus of the composite at 50 wt.% of cotton fibers enhanced by 272% the modulus of the matrix. From the micromechanics analysis, using the Hirsch model, the intrinsic flexural modulus of cotton fibers was set at 20.9 GPa. Other relevant micromechanics factors were studied to evaluate the contribution and efficiency of the fibers to the flexural modulus of the composite. Overall, the work sheds light on the potential of cotton industry byproducts to contribute to a circular economy.

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“…Hemp core residues are principally devoted to low value applications, such as animal bedding, mainly because of the high capacity to adsorb liquids. However, hemp core residues have recently drawn the attention of researchers as a potential source of reinforcements for polymer-based composites and a valuable substitute for wood in wood–plastic composites [ 14 , 15 , 16 , 17 ]. The main drawbacks of hemp core fibers compared to wood fibers are an elevated content of lignin (21–24 wt %) along with low aspect ratios, which can lead to composites with weak interfacial adhesion.…”

Section: Introductionmentioning

confidence: 99%

Effect of NaOH Treatment on the Flexural Modulus of Hemp Core Reinforced Composites and on the Intrinsic Flexural Moduli of the Fibers

et al. 2020

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This paper describes the potential of using hemp core waste in the composite industry. These lignocellulosic residues can be used to produce environmentally friendly and economically viable composites and improve the overall value chain of hemp production. To this purpose, hemp core residues were alkaline treated at different NaOH concentrations and then mechanically defibrated. Hemp core fibers were mixed with polypropylene and injection molded to obtain testing specimens. The effect of sodium hydroxide on the flexural modulus of composites was studied from macro and micro mechanical viewpoints. Results showed remarkable improvements in the flexural modulus due to the presence of hemp core fibers in the composites. At a 50 wt % of reinforcement content, increments around 239%, 250% and 257% were obtained for composites containing fibers treated at a 5, 7.5 and 10 wt % of NaOH, respectively. These results were comparable to those of wood composites, displaying the potential of hemp core residues. The intrinsic flexural modulus of the hemp core fibers was computed by means of micromechanical analysis and was calculated using the ratios between a fiber flexural modulus factor and a fiber tensile modulus factor. The results agreed with those obtained by using models such as Hirsch and Tsai–Pagano. Other micromechanical parameters were studied to fully understand the contribution of the phases. The relationship between the fibers’ intrinsic flexural and Young’s moduli was studied, and the differences between properties were attributed to stress distribution and materials’ anisotropy.

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Improving the performance of hemp hurd/polypropylene composites using pectinase pre-treatments

Cited by 28 publications

References 14 publications

Lignocellulosic fibers: a critical review of the extrusion process for enhancement of the properties of natural fiber composites

Lignocellulosic fibers: a critical review of the extrusion process for enhancement of the properties of natural fiber composites

Exploring the Potential of Cotton Industry Byproducts in the Plastic Composite Sector: Macro and Micromechanics Study of the Flexural Modulus

Effect of NaOH Treatment on the Flexural Modulus of Hemp Core Reinforced Composites and on the Intrinsic Flexural Moduli of the Fibers

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