Effect of plasma modification of polyethylene on natural fibre composites prepared via rotational moulding

Sari, P. S.; Thomas, Sabu; Špatenka, Petr; Ghanam, Zoya; Jenikova, Zdenka

doi:10.1016/j.compositesb.2019.107344

Cited by 50 publications

(49 citation statements)

References 26 publications

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“…Short plasma treatments times are used in industrial applications, e.g., enhanced adhesion of PUR foams to inner surface of parts produced by rotomolding from plasma-treated powders [ 14 ]. Other examples are rotomolding with natural fibers [ 16 ], short glass fibers [ 47 ] and multilayer PE/PA parts [ 4 ]. The use of plasma-treated powders in the whole possible time range of plasma treatment is limited due to the unclear effect of various treatment parameters and their behavior during a sintering process.…”

Section: Resultsmentioning

confidence: 99%

“…Such treatment is already available on an industrial scale [ 13 , 14 ]. As shown in [ 15 , 16 , 17 ], plasma treatment of PE powder alters its surface properties and dramatically increases its adhesion to glass, metal and natural fibers. It is a highly variable process and, therefore, it is necessary to find optimal settings for a specific use [ 13 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

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New Method for Optimization of Polymer Powder Plasma Treatment for Composite Materials

et al. 2021

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This paper describes a newly developed testing method for determination of the adhesivity of a film sintered from thermoplastic powder. This method is based on the modified EN 15337 standard. Application of this method enables an effective development of thermoplastic composites with enhanced adhesion between reinforcement and matrix and/or high-quality joints between plastics and dissimilar materials. The proposed method was successfully tested on a series of polyethylene powders treated in the oxygen atmosphere for 0–1200 s. Adhesion to metal and glass substrates in dependence on treatment conditions is described along with powder wettability and X-ray photoelectron spectroscopy analysis. The results show an increase in adhesion to metal by 580% and to glass by 1670% for the longest treatment time, compared to a nontreated powder. Sintering of treated powders revealed a strong influence of treatment time on the melting process. The XPS analysis confirmed the formation of new oxygen groups (C–O, C=O, O–C=O). The method reveals a specific behavior of powders based on treatment conditions, which is crucial for the optimization of plasma treatment for the improved adhesion, applicability of polymer powders, and a development of composite materials.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New Method for Optimization of Polymer Powder Plasma Treatment for Composite Materials

et al. 2021

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“…Current research in the field of the new rotational molding materials is mainly focused on the reinforcement of polyethylene, where the problem of insufficient adhesion to fibers is caused by the pressureless nature of this technology. The uniform fiber distribution across the product wall is still not fully solved as well [5][6][7][8][9][10]. Another way to expand the portfolio of materials is to combine polyethylene with other plastics, thus creating multi-layer products.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical properties improved even when the plasma-treated PE matrix was reinforced with natural coconut fibers. The addition of new functional groups improved the hydrophilicity of PE, which could improve the compatibility between the polymer matrix and the natural fiber [9]. The combination of metals and polymers also seems promising.…”

Section: Introductionmentioning

confidence: 99%

Adhesion Improvement between PE and PA in Multilayer Rotational Molding

Sezemský

Špatenka

2021

Polymers

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The aim of this study is to investigate a multilayer structure made of polyethylene and polyamide by rotational molding. Due to the different polarity of these polymers, it is difficult to ensure enough adhesion between created layers. Two methods leading to improve adhesion are introduced. Plasma modification of polyethylene powder, after which new functional groups are bound to the treated surface, may enhance specific adhesion by forming hydrogen bonds with-CONH groups of polyamide. Different strategies of adding material to the mold give rise to complicated interlayer which increases joint strength by mechanism of the mechanical adhesion. Mechanical tests show a significant improvement of joint strength, where treated samples reached two-fold values of peel strength (7.657 ± 1.024 N∙mm−1) against the untreated sample (3.662 ± 0.430 N∙mm−1). During bending test, delamination occurred only in samples that were made of the untreated polyethylene. Adding polyamide during the melting stage of polyethylene powder in rotomolding resulted in the formation of entanglements which improve the peel strength almost eight times in comparison with the sample where the polyethylene was left to completely melt and create smooth interlayer surface.

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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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Effect of plasma modification of polyethylene on natural fibre composites prepared via rotational moulding

Cited by 50 publications

References 26 publications

New Method for Optimization of Polymer Powder Plasma Treatment for Composite Materials

New Method for Optimization of Polymer Powder Plasma Treatment for Composite Materials

Adhesion Improvement between PE and PA in Multilayer Rotational Molding

Lightweight polyethylene‐hollow glass microspheres composites for rotational molding technology

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