Flexural properties of fully biodegradable alpha-grass fibers reinforced starch-based thermoplastics

Espinach, Francesc X.; Delgado-Aguilar, Marc; Puig, Josep; Julián, Fernando; Boufi, Sami; Mutjé, Pere

doi:10.1016/j.compositesb.2015.07.004

Cited by 44 publications

(22 citation statements)

References 54 publications

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“…Unfortunately, WFs also exhibit some disadvantages such as heat or water sensitivity and poor adhesion due to their high hydroscopic nature in comparison with the hydrophobic polyolefin matrices. Furthermore, the addition of natural fillers makes the manufacturing process difficult because natural fillers, mainly those containing lignocelluloses, are thermally sensitive components [12]. Due to the disadvantages associated with WPC processing, composites are produced with mineral fillers [13,14].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Wood and Basalt Fibres on Mechanical, Thermal and Hydrothermal Properties of PLA Composites

2020

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In this study, biodegradable biocomposites based on polylactide with basalt fibres (BFs) or wood fibres (WFs) of 7.5 or 15 wt% were prepared by injection moulding. Various tests, including tensile test, bending test and impact test, were carried out to investigate the mechanical properties of the composites. Additionally, the samples were tested at different temperatures. Depending on the type of fibre, differences were noted in their mechanical properties; the addition of WF caused a decrease in strength and the higher the fibre content, the higher the decrease was noted from 18% up 25% in the case of tensile strength. However, the Young modulus was improved by 45% for composites with 15 wt% of WF. The addition of BF improved all the properties, especially Young modulus was improved by over 45%. Despite the low strength observed in neat polylactide at high temperatures-394 MPa, the addition of WF or BF improved the flexural strength more than twofold up to 1684 MPa (PLA/15BF). Moreover, the addition of natural fibres caused an increase in dimensional stability as shown by the decrease of the coefficient of thermal expansion which dropped over 50% for composites with 15 wt% of BF, which significantly expands the areas of use of materials. After 4 weeks of biodegradation, only a slight decrease approximately 5% was observed in the mechanical properties together with an increase in crystallinity. Overall, the results confirm that the prepared composites can be successfully used in engineering applications with long-term operation.

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Section: Introductionmentioning

confidence: 99%

The Influence of Wood and Basalt Fibres on Mechanical, Thermal and Hydrothermal Properties of PLA Composites

2020

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“…Starch‐based materials have also exhibited the advantages of biocompatibility and biodegradability in medicinal drug‐release, packaging, and agricultural applications . Because of these reasons, more and more attention is being paid to the development of biodegradable and edible particles used for the reinforcement of starch‐based films …”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of starch‐based composite films reinforced by corn and wheat hulls

Ali

Liu

et al. 2017

J of Applied Polymer Sci

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Biodegradable films, with starch as a matrix, were developed and reinforced with wheat and corn hulls. The effect of the particle size of the filler on the microstructure and mechanical and barrier properties of starch‐based films was investigated. We observed that the addition of hulls enhanced the modulus, tensile strength, and impact strength of the starch matrix at the expense of its elongation. The water‐vapor transmission rate results show that corn starch was more efficient in reducing the water‐vapor permeability than wheat hulls. Scanning electron microscopy observations indicated that the compatibility of both fillers with the matrix was quite good; this was expected because all of the components used in this study were hydrophilic and exhibited polar behavior. Optical microscopy and X‐ray diffraction observations indicated that the processing conditions did not affect the crystalline and geometric structures of the hulls. Because all of the components used in this study were from food resources, the films could also be used for edible packaging. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45159.

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“…23 Alfa fibers have been used to enhance the mechanical properties of polymeric composites. 8,24,25 However, to our knowledge, composites with steam-exploded Alfa fibers where fiber extraction works with water only and composites with stearic acid-treated Alfa fibers have not yet been reported in the literature. Also, the solvents of the stearic acid that were reported in the processing of composites with other types of fibers were always based on toluene 19,20 and are thus extremely dangerous.…”

Section: Introductionmentioning

confidence: 97%

“…Alfa stems are characterized by a density d = 0.89, Young's modulus E = 22 GPa, and strength at break σ b = 565 MPa . Alfa fibers have been used to enhance the mechanical properties of polymeric composites . However, to our knowledge, composites with steam‐exploded Alfa fibers where fiber extraction works with water only and composites with stearic acid‐treated Alfa fibers have not yet been reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Alfa fiber/polypropylene composites: Influence of fiber extraction method and chemical treatments

Labidi

Cao

Zrida

et al. 2019

J of Applied Polymer Sci

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Alfa fiber/polypropylene composites were manufactured using twin‐screw extrusion. Fibers were extracted using alkaline and steam explosion methods. Three chemical treatments were also applied to the alkaline‐extracted fibers: stearic acid (SA), and potassium permanganate dissolved in water (KW) and in acetone (KA). Finally, thermal annealing was applied to the composites. The results indicate that composites with steam‐exploded fibers had a significantly higher melt flow index than composites with alkaline‐extracted fibers. Moreover, the incorporation of fibers into the matrix increased the Young's modulus, where the optimum results were obtained utilizing the alkaline‐extracted fibers. Both extraction methods also significantly decreased the water uptake, especially the steam explosion. The three chemical treatments increased the melt flow index and conversely decreased the tensile strength and Young's modulus. In addition, KW treatment decreased the water uptake. Finally, thermal annealing increased the tensile strength and Young's modulus of composites with SA‐treated fibers. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47392.

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Flexural properties of fully biodegradable alpha-grass fibers reinforced starch-based thermoplastics

Cited by 44 publications

References 54 publications

The Influence of Wood and Basalt Fibres on Mechanical, Thermal and Hydrothermal Properties of PLA Composites

The Influence of Wood and Basalt Fibres on Mechanical, Thermal and Hydrothermal Properties of PLA Composites

Preparation and characterization of starch‐based composite films reinforced by corn and wheat hulls

Alfa fiber/polypropylene composites: Influence of fiber extraction method and chemical treatments

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