Preparation and characterization of multilayer foamed composite by rotational molding

Vázquez‐Fletes, Roberto Carlos; Rosales-Rivera, Luis Carlos; Moscoso-Sánchez, Francisco Javier; Mendizábal, Eduardo; Ortega-Gudiño, Pedro; González‐Núñez, Rubén; Rodrigue, Denis

doi:10.1002/pen.24253

Cited by 16 publications

(22 citation statements)

References 41 publications

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“…Finally, the fibers were grounded and sieved to keep only the fibers between 100 mesh and 140 mesh to give and average size between 106 and 150 microns. This particle size produced the best dispersion, distribution and mechanical performance, according to previous studies [16,23]. Before rotational molding, the fibers were dried again in an oven for 24 h at 60 • C to reach moisture contents less than 1%.…”

Section: Fiber Preparationmentioning

confidence: 81%

Section: Morphologymentioning

confidence: 89%

“…The addition of 0.75% ACA resulted in 103%, 108% and 127% thickness increase when using 5%, 10% and 15% of AF, respectively. In a previous work [23], it was shown that at low proportions (< 15 wt %), fiber addition generally does not affect the total thickness of rotomolded parts. Typical scanning electron microscope (SEM) images of the bilayer samples are presented in Figure 6, where the formation of two layers is clearly seen in Figure 4.…”

Section: Morphologymentioning

confidence: 89%

“…An increase of 83% in the total thickness was obtained with the maximum ACA content used (0.75%) compared to the same part without ACA (0%). For three-layer materials obtained by rotational molding using a foaming agent where a thickness increase of 56% was reported [23]. When processing by rotational molding single-layer materials, a thickness increase from 3 to 15 mm was observed when 1 wt % ACA was used.…”

Section: Morphologymentioning

confidence: 98%

“…As a preliminary work, three-layer materials were prepared with agave fibers as reinforcement, azodicarbonamide as a foaming agent and LMDPE as the matrix [23]. In the external layer, agave fibers were used, while the middle layer was foamed using ACA and the inner layer was neat LMDPE.…”

Section: Introductionmentioning

confidence: 99%

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Morphological and Mechanical Properties of Bilayers Wood-Plastic Composites and Foams Obtained by Rotational Molding

et al. 2020

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In this work, the suitability for the production of sustainable and lightweight materials with specific mechanical properties and potentially lower costs was studied. Agave fiber (AF), an agro-industrial waste, was used as a reinforcement and azodicarbonamide (ACA) as a chemical blowing agent (CBA) in the production of bilayer materials via rotational molding. The external layer was a composite of linear medium density polyethylene (LMDPE) with different AF contents (0–15 wt %), while the internal layer was foamed LMDPE (using 0–0.75 wt % ACA). The samples were characterized in terms of thermal, morphological and mechanical properties to obtain a complete understanding of the structure-properties relationships. Increases in the thicknesses of the parts (up to 127%) and a bulk density reduction were obtained by using ACA (0.75 wt %) and AF (15 wt %). Further, the addition of AF increased the tensile (23%) and flexural (29%) moduli compared to the neat LMDPE, but when ACA was used, lower values (75% and 56% for the tensile and flexural moduli, respectively) were obtained. Based on these results, a balance between mechanical properties and lightweight can be achieved by selecting the AF and ACA contents, as well as the performance and aesthetics properties of the rotomolded parts.

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Section: Fiber Preparationmentioning

confidence: 81%

Section: Morphologymentioning

confidence: 89%

Section: Morphologymentioning

confidence: 89%

Section: Morphologymentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Morphological and Mechanical Properties of Bilayers Wood-Plastic Composites and Foams Obtained by Rotational Molding

et al. 2020

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Effect of surface modification and fiber content on the mechanical performance of compression molded polyethylene‐maple composites

2021

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With the objective of producing more sustainable materials, wood-plastic composites were produced using linear low density polyethylene and a wide range of maple wood fiber content (up to 80% wt). This was possible by using a simple dry-blending of the component in a powder form and compression molding. In particular, the effect of different surface treatments (mercerization, maleated polyethylene [MAPE], and their combination) on the morphology and mechanical performance of these composites was studied. The results show that all the surface treatments investigated were able to improve the fiber-matrix adhesion, leading to better composite homogeneity, and higher mechanical properties. Furthermore, it was possible to increase the amount of wood that can be introduced in the composites compared to untreated fibers. In our case, up to 80% wt of maple fibers were easily processed generating significant improvements in moduli (367%) and strength (50%), especially when a combination of alkali-MAPE treatment was performed. This simple processing of the composites is interesting to produce different parts size and geometry with limited degradation since no melt compounding is performed. The work also represents a way to produce sustainable, economic, and lightweight composites with improved properties using a high content of renewable filler.

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An Investigation of Low Velocity Impact Properties of Rotationally Molded Skin–Foam–Skin Sandwich Structure

Saifullah

Thomas

Cripps³

et al. 2019

Polymer Engineering & Sci

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In this study, the low velocity impact properties of rotationally molded skin-foam-skin sandwich structures were investigated experimentally since there is a need for a greater understanding of the impact behavior of these composites in service to extend the range of their applications. Polyethylene rotationally molded sandwich structures were manufactured at various skin and core layer thickness combinations and tested using an instrumented low velocity drop weight impact testing machine at 20-100 J impact energy levels, at room temperature. This allowed the identification of the impact response, failure mode, and the effects of the skin and core layer thickness on impact resistance. Forcedeflection curves, maximum force, contact time, maximum deflection versus impact energy curves were analyzed. Samples were seen to fail due to the indentation dart piercing the upper and lower skins, with crushing and consolidation seen in the core foamed layer. Delamination at the core/skin interface was not observed. It was found that fracture initiates from the lower skin and then continues to grow to the upper skin via the foamed core layer. The impact resistance was noted to increase with increasing skin and core layer thickness; though an increase in skin layer thickness had a greater contribution than an increase in the core layer thickness.

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Preparation and characterization of multilayer foamed composite by rotational molding

Cited by 16 publications

References 41 publications

Morphological and Mechanical Properties of Bilayers Wood-Plastic Composites and Foams Obtained by Rotational Molding

Morphological and Mechanical Properties of Bilayers Wood-Plastic Composites and Foams Obtained by Rotational Molding

Effect of surface modification and fiber content on the mechanical performance of compression molded polyethylene‐maple composites

An Investigation of Low Velocity Impact Properties of Rotationally Molded Skin–Foam–Skin Sandwich Structure

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