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

Vázquez‐Fletes, Roberto Carlos; López, Erick Omar Cisneros; Sánchez, Francisco Javier Moscoso; Mendizábal, Eduardo; González‐Núñez, Rubén; Rodrigue, Denis; Ortega-Gudiño, Pedro

doi:10.3390/polym12030503

Cited by 32 publications

(35 citation statements)

References 39 publications

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“…The aim is to explore and characterize new materials to be used on the rotational molding process to produce differentiated new products with high value, sustainability, aesthetics, and functionality. This study is in line with other recently published articles in the finding of new materials for rotational molding (Greco et al, 2019;Vignali et al, 2019;Fletes et al, 2020).…”

Section: Introductionsupporting

confidence: 93%

“…This technique is used to produce hollow parts for various applications like liquid storage tanks, containers, toys, indoor and outdoor furniture, and playgrounds, among other applications. The advantages are the production of stress-free parts; the low costs for tooling's and molds; the little or no waste production; and the low restriction on mold design allowing the production of multilayer materials, especially when different compositions and thicknesses are required (Jansri and O-charoen, 2018;Fletes et al, 2020). This process is based on the rotation of polymeric powder material in an externally heated and cooled mold.…”

Section: Introductionmentioning

confidence: 99%

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Processing–Structure–Properties of Cork Polymer Composites

Martins

Gil

2020

Front. Mater.

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This work aims at presenting a new strategy for the use of cork by-products on the development of sustainable composites with potential applications in rotational molding. In this study, different cork granulometries (0.15-3 mm) and matrix/cork ratios (90/10, 85/15, 80/20) are analyzed to access the processability of medium-density polyethylene (MDPE) with cork by rotational molding. The influence of processing parameters, such as the mold peak internal air temperature (PIAT) (200-240 • C), is analyzed and correlated with the aesthetics, morphological and mechanical properties of the parts. The aim is to obtain a complete understanding of the processing-structure-property relationships. Defect-free parts are obtained with thin granulometric cork powders at a maximum of 10% by weight in PE/cork composites. The increase in cork content reduces the sintering capability and increases the porosity, wall thickness, and surface defects, simultaneously weakening the mechanical properties. The increase in PIAT favors a more compact structure and reveals better impact properties. All the parts are soft on touch and transmit the comfort and sensation of warm feeling of the cork. Moreover, lightweight parts and hydrophobic surfaces are achieved from the cork intrinsic properties. As a natural material, cork darkens its color with temperature, which is attributed to the reactions of the extractives within the components of cork, with no degradation associated. The work shows that polymer cork composites (CPC) are suitable for rotational molding within the processing window characteristic of PE, to achieve innovative and sustainable products with unique aesthetics and functionalities given by the cork material.

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Section: Introductionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Processing–Structure–Properties of Cork Polymer Composites

Martins

Gil

2020

Front. Mater.

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“…[ 35‐37 ] As reported by various authors the fiber content also influences the porosity of the material as more defects are created with increasing UF fiber content. [ 25,38‐40 ]…”

Section: Resultsmentioning

confidence: 99%

“…[35][36][37] As reported by various authors the fiber content also influences the porosity of the material as more defects are created with increasing UF fiber content. [25,[38][39][40] Figure 4 presents SEM images at higher magnification to investigate the fiber-matrix interface. It can be seen that the UF surface is rougher with sharp edges and corners (Figure 4(A)) compared to the surface of the treated fiber (smoother) with rounded corners and a more uniform texture (Figure 4(B)-(D)).…”

Section: Mechanical Testingmentioning

confidence: 99%

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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“…Compared to neat PE, an enhancement of mechanical performance, in terms of tensile, flexural and impact analysis, was also observed in several works on PE/natural fibers composites prepared by RM. In particular agave, 7–10 coir 9,11 and maple 12 were used as fibrous reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Lightweight polyethylene‐hollow glass microspheres composites for rotational molding technology

Stagnaro¹,

Utzeri²,

Vignali

et al. 2020

J of Applied Polymer Sci

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Innovative composites based on polyethylene (PE) filled with hollow glass microspheres (HGMs) were formulated and successfully prepared as suitable plastic materials for rotational molding technology. The HGMs here used allow to attain lightweight materials with a reduced resin content and appealing aesthetical qualities. To enhance filler dispersion and phase adhesion, thus improving the ultimate properties of the composite materials, two compatibilization strategies were adopted: namely, surface modification of HGMs by dodecyl(triethoxy)silane or addition during mixing of a maleinized PE as insitu coupling agent. The effectiveness of the surface treatments on HGMs was assessed by attenuated total reflectance Fourier-transform infrared spectroscopy and thermogravimetric analysis investigations. PE-based composites at various HGMs contents (5, 10, and 20 wt%) were prepared by melt blending. Morphology of untreated and modified HGMs, their dispersion in the composites as well as filler/matrix adhesion were investigated by SEM microscopy. Thermal, rheological and mechanical properties of the composites were studied in comparison with neat PE. Rotational molding tests carried out both in laboratory and industrial site demonstrated the feasibility of producing lightweight plastic items (weight reduction up to 17%) of excellent aesthetics on a large scale.

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

Cited by 32 publications

References 39 publications

Processing–Structure–Properties of Cork Polymer Composites

Processing–Structure–Properties of Cork Polymer Composites

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

Lightweight polyethylene‐hollow glass microspheres composites for rotational molding technology

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