Characterization of composites based on expanded polystyrene wastes and wood flour

Poletto, Matheus; Dettenborn, Juliane; Zeni, Mára; Zattera, Ademir J.

doi:10.1016/j.wasman.2010.10.027

Cited by 102 publications

(88 citation statements)

References 20 publications

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“…It is evident that with the admixture of wood sawdust into the PCR-HDPE matrix, the loss modulus increased with the proportion of OWS. This phenomenon is due to the higher OWS content increasing the internal friction which enhances the dissipation of energy in the composite 5,20 . Additionally, the loss modulus value was noted to be higher due to the presence of OWS which reduced the flexibility of the composite material by introducing constraints on the segmental mobility of the polymeric molecules at the relaxation temperatures 5,[20][21][22] .…”

Section: Dynamic Mechanical Thermal Propertiesmentioning

confidence: 99%

“…Wood/recycled plastic composite materials were fabricated successfully by mixing recycled HDPE and post-consumer wood sawdust from a single screw extruder 4 . Recycled expanded polystyrene and wood flour can be used to manufacture composites with high mechanical properties and low density 5 . Furthermore, composites made from post-consumer recycled HDPE (PCR-HDPE) have similar or, in some cases, better mechanical properties than composites made from virgin HDPE 6,7 .…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and thermal properties of oil palm wood sawdust reinforced post-consumer polyethylene composites

Ratanawilai¹,

Thanawattanasirikul²,

Homkhiew³

2012

ScienceAsia

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Post-consumer recycled high-density polyethylene (PCR-HDPE) composites reinforced with 30, 40, and 50% of oil palm wood sawdust (OWS) were prepared by compression moulding. The effects of the OWS content and the moulding temperature on the flexural and compressive properties of the composites were investigated and were found to be highly significant. Increases in the proportion of OWS in the matrix caused a gradual worsening in the mechanical properties of the composites. However, higher moulding temperatures moderately improved the mechanical properties. Dynamic mechanical thermal analysis was used to study the viscoelastic behaviour, and thermogravimetric analysis was used to study the thermal stability of the composites. The storage and loss moduli gradually decreased with increasing temperature and significantly increased with increasing the proportion of OWS in the composites. The thermal stability of the composites slightly dropped with a higher OWS content. These results suggest that PCR-HDPE and OWS can be used to create composite materials with good mechanical and thermal properties.

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Section: Dynamic Mechanical Thermal Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical and thermal properties of oil palm wood sawdust reinforced post-consumer polyethylene composites

Ratanawilai¹,

Thanawattanasirikul²,

Homkhiew³

2012

ScienceAsia

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“…Compósitos com fibras naturais têm propriedades mecânicas superiores ao polímero puro [3][4][5] e que a capacidade de processamento dos compósitos reforçados com fibras vegetais está diretamente relacionada ao índice de fluidez da matriz e ao teor de fibras utilizado [6] . Dentre as fibras vegetais utilizadas como reforço em compósitos estão as fibras de curauá.…”

Section: Introductionunclassified

Efeito do tratamento alcalino de fibras de curauá sobre as propriedades de compósitos de matriz biodegradável

Beltrami¹,

Scienza²,

Zattera³

2014

Polímeros

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Resumo: Neste trabalho avaliou-se a influência do tratamento alcalino das fibras de curauá, nas concentrações de 1, 5 e 10%(m/v) de NaOH, nas propriedades dos compósitos com matriz de PHBV e 20% m/m de fibras de curauá. Os compósitos foram moldados por extrusão e injeção e avaliadas suas as propriedades morfológicas, térmicas e mecânicas. Os resultados de FTIR mostraram que o tratamento alcalino promoveu modificações na estrutura das fibras de curauá, comprovadas pela remoção da hemicelulose e da lignina, evidenciadas pela ausência das bandas típicas destes compostos. Nos compósitos com fibras de curauá tratadas com solução de NaOH na concentração de 5% apresentaram um aumento de 30% na resistência à flexão e 12% na resistência ao impacto, quando comparados aos compósitos com fibras sem tratamento. Estes resultados indicam que o tratamento alcalino promoveu uma melhoria na adesão das fibras na matriz, o que melhorou significativamente as propriedades mecânicas dos compósitos. Palavras-chave: Compósitos, PHBV, fibras de curauá, tratamento alcalino. Effect of the Alkaline Treatments of Curauá Fiber on the Properties of Biodegradable Matrix CompositesAbstract: This study investigate the influence of alkaline treatment applied to Curauá fibers, at concentrations of 1, 5 and 10% (w/v) NaOH, on the properties of the composite of PHBV matrix with 20 wt % Curauá fiber. The composites were molded by extrusion and injection and their morphological, thermal and mechanical properties were evaluated. The results showed that alkali treatment caused modifications in the structure of the Curauá fibers by the removal of hemicellulose and lignin, as evidenced by the absence of the typical bands of these compounds in FTIR analysis. It was found an increase of 30% in flexural strength and 12% in impact resistance for the composites with fibers treated in 5% NaOH solution, in relation to composites with fibers without treatment. These results indicate that the alkaline treatment promoted an improvement in the adhesion of the fibers to the matrix, which significantly improved the mechanical properties of the composites. However, concentrations of NaOH solution different from 5% may have a deleterious effect on the mechanical properties of the fibers and composites.

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“…The SEM micrographs of composites without and with 2 wt% of coupling agent are shown in Figure 4(a) and (b), respectively. In Figure 4(a), examination of the cryo fracture surface of composite without coupling agent indicated the presence some voids where the fibres have been pulledout and bigger gaps between the wood flour and matrix, which is evidence of weak interfacial adhesion at the interface (Poletto et al 2011, George et al 2013. The SEM micrograph of treated composite was presented in Figure 4(b).…”

Section: Morphology Characteristicsmentioning

confidence: 99%

“…Mechanical properties of polymer composites are well known to be affected strongly by internal defects such as voids (Takagi et al 2008, Poletto et al 2011. Consequently, the density and void content usually serve as good indicators for composite strength (Borja et al 2006, Takagi et al 2008).…”

Section: Densitymentioning

confidence: 99%

Effect of styrene maleic anhydride on physical and mechanical properties of recycled polystyrene wood flour composites

Poletto

2016

Maderas, Cienc. tecnol.

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In this work, the influence of three types of styrene maleic anhydride (SMA) oligomers on the adhesion of polystyrene wood plastic composites (WPC) was investigated. The composites were processed on a twin-screw co-rotating extruder below 200°C using 20 wt% of wood flour. The styrene maleic anhydride with different content of maleic anhydride groups, 30%, 25% and 20% (w/w) and levels of 1, 2 and 4% of coupling agents (styrene maleic anhydride 2000, styrene maleic anhydride 3000 and styrene maleic anhydride EF40) in the composite formulations were tested. Mechanical, physical and morphologic properties were evaluated. The styrene maleic anhydride improves the compatibility of hydrophilic wood flour with hydrophobic polystyrene matrix. It has been observed that the addition of styrene maleic anhydride increased the wood plastic composites mechanical properties with the incorporation of 2% wt of styrene maleic anhydride 2000. The mechanical properties showed to be dependent on content of maleic anhydride in the coupling agent. Treated and non-treated wood plastic composites showed similar density values, but the void content was reduced for treated composites. Scanning electron microscopy revel the better adhesion between polymer and matrix when coupling agent were used.

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Characterization of composites based on expanded polystyrene wastes and wood flour

Cited by 102 publications

References 20 publications

Mechanical and thermal properties of oil palm wood sawdust reinforced post-consumer polyethylene composites

Mechanical and thermal properties of oil palm wood sawdust reinforced post-consumer polyethylene composites

Efeito do tratamento alcalino de fibras de curauá sobre as propriedades de compósitos de matriz biodegradável

Effect of styrene maleic anhydride on physical and mechanical properties of recycled polystyrene wood flour composites

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