Tensile properties and micromechanical analysis of stone groundwood from softwood reinforced bio-based polyamide11 composites

Oliver-Ortega, Helena; Granda, L.A.; Méndez, José Alberto; Julián, Fernando; Mutjé, Pere

doi:10.1016/j.compscitech.2016.07.004

Cited by 45 publications

(62 citation statements)

References 36 publications

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“…Thus, the obtained differences are understandable when considering that the tensile strength of PP is significantly lower than PVA's. The same reinforcement exhibited an interfacial shear strength of 19.3 MPa when polyamide 11 (PA11) was used as matrix, which was a value near to Tresca criteria for PA11-based composites [89]. Thus, the PVA-based composites showed interfaces that were weaker than PP-based materials but stronger than PA11 ones.…”

Section: Micromechanal Analysis Of the Interface Of The Nanocompositesmentioning

confidence: 80%

“…The intrinsic tensile strength of a reinforcement that was obtained by using micromechanics is related with the exploitation of the strengthening abilities of the fibers instead of its tensile properties as single fibers. In this sense, SGW-reinforced PA11 composites delivered a value of 562 MPa [89,91]. The obtained orientation factor and interfacial shear strength were used as input for the Kelly and Tyson modified equation with the data for the composites with 20 and 30 wt % SGW contents, thus obtaining theoretical values for the intrinsic tensile strength of the SGW.…”

Section: Micromechanal Analysis Of the Interface Of The Nanocompositesmentioning

confidence: 99%

“…The shape of such curves hinders the application of Bowyer and Bader's solution to the Kelly and Tyson model. Other composites do not show this region of low slope [58,89]. It was impossible to solve the equation for the composites with SGW contents lower than 40 wt %.…”

Section: Micromechanal Analysis Of the Interface Of The Nanocompositesmentioning

confidence: 99%

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Research on the Strengthening Advantages on Using Cellulose Nanofibers as Polyvinyl Alcohol Reinforcement

et al. 2020

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The present work aims to combine the unique properties of cellulose nanofibers (CNF) with polyvinyl alcohol (PVA) to obtain high-performance nanocomposites. CNF were obtained by means of TEMPO-mediated ((2,2,6,6-Tetramethylpiperidin-1-yl)oxyl) oxidation, incorporated into the PVA matrix by means of compounding in a single-screw co-rotating internal mixer and then processed by means of injection molding. It was found that CNF were able to improve the tensile strength of PVA in 85% when 4.50 wt % of CNF were added. In addition, the incorporation of a 2.25 wt % of CNF enhanced the tensile strength to the same level that when 40 wt % of microsized fibers (stone groundwood pulp, SGW) were incorporated, which indicated that CNF possessed significantly higher intrinsic mechanical properties than microsized fibers. SGW was selected as reference for microsized fibers due to their extended use in wood plastic composites. Finally, a micromechanical analysis was performed, obtaining coupling factors near to 0.2, indicating good interphase between CNF and PVA. Overall, it was found that the use of CNF is clearly advantageous to the use of common cellulosic fibers if superior mechanical properties are desired, but there are still some limitations that are related to processing that restrict the reinforcement content at low contents.

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Section: Micromechanal Analysis Of the Interface Of The Nanocompositesmentioning

confidence: 80%

Section: Micromechanal Analysis Of the Interface Of The Nanocompositesmentioning

confidence: 99%

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Research on the Strengthening Advantages on Using Cellulose Nanofibers as Polyvinyl Alcohol Reinforcement

et al. 2020

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“…It is well known that the mechanical properties of composites based on natural fibers are strongly influenced by the interfacial adhesion between the fibers and the matrix; this is related to the chemical composition of the fiber surface. A good interface causes an increment in the stress transmission from the matrix to the fiber and enhances the mechanical properties of composites . All in all, the removed waxes, the dissociated lignin and hemicellulose, the exposed cellulose, the increased density and specific surface area, and the biosurfactants produced by microorganisms were conducive to improvements in the plasticity and interfacial adhesion.…”

Section: Resultsmentioning

confidence: 99%

Physicochemical changes in rice straw after composting and its effect on rice‐straw‐based composites

Huang

Zhao

et al. 2017

J of Applied Polymer Sci

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A composting method was applied to improve the processability of rice straw (RS) and its interfacial interaction with a biodegradable resin, hydrolyzed‐soy‐protein‐modified urea formaldehyde adhesives. The composted RS was characterized by fiber testing, Fourier transform infrared spectroscopy, thermogravimetry, differential scanning calorimetry, and scanning electron microscopy. We found that the particle size of RS was reduced from 0.6–2.0 to 0.2–0.6 mm. The cellulose content decreased, and the lignin content increased; unstable bonds were decomposed after composting. All of the results were beneficial for improving the plasticity of RS. Composted RS with inoculant exhibited a higher peak degradation temperature (352 °C) than the untreated RS (347 °C). The porous structure and tissue in RS were destroyed by the microorganism. The best bonding results were obtained by the composted RS with inoculant. Compared with untreated composites, the modulus of rupture, modulus of elasticity, and tensile strength of the composites were improved by 14.94, 25.36, and 27.21%, respectively. In addition, a mechanism of the structural changes of RS during composting was also proposed. The full biodegradable composites have potential applications in agriculture toward the achievement of sustainable development. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44878.

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“…The same dependence of the tensile strength and fiber content was observed for polyamide 11 with stone groundwood fibers. However, after addition of 60 wt% of fibers the tensile strength decreased [81,82]. Improvement of tensile properties in composites is related to the ability of transferring the stress between the polymer and the fiber and indicates a good interfacial adhesion between the filler and the matrix.…”

Section: Mechanical Properties Of Biopolyamides Reinforced By Naturalmentioning

confidence: 99%

Modern biopolyamide-based materials: synthesis and modification

2019

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The wider use of renewable feedstock in structural applications, where high mechanical performance is required, can be achieved by the application of recently developed engineering biopolymers and their further modification by micro-and nanoparticles. In this review, we present the current state of the art of biopolyamide materials for structural and functional applications. The overview includes all stages of the manufacturing-from the synthesis of building blocks, through the synthesis of polymers and its physical modification, with special emphasis on the properties of the obtained engineering biocomposites as a final product of modern polymer technology. In the first part, the synthetic routes of bio-derived counterparts of common polyamides as well as specialty polymers with functional properties arising from the complex structure of biochemicals were exemplified. The development of environmentally friendly composites and nanocomposites based on biopolyamides and natural fillers, such as plant fibers or cellulosic nanofibers, was of particular interest due to preserved sustainable character of such materials.

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Tensile properties and micromechanical analysis of stone groundwood from softwood reinforced bio-based polyamide11 composites

Cited by 45 publications

References 36 publications

Research on the Strengthening Advantages on Using Cellulose Nanofibers as Polyvinyl Alcohol Reinforcement

Research on the Strengthening Advantages on Using Cellulose Nanofibers as Polyvinyl Alcohol Reinforcement

Physicochemical changes in rice straw after composting and its effect on rice‐straw‐based composites

Modern biopolyamide-based materials: synthesis and modification

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