Compósitos de polietileno reciclado e partículas de madeira de reflorestamento tratadas com polietileno modificado

Redighieri, Karla I.; Costa, Dilma Alves

doi:10.1590/s0104-14282008000100006

Cited by 13 publications

(9 citation statements)

References 13 publications

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“…Os melhores resultados nos ensaios mecânicos observados com o uso do PEAD-g-MA, como agente de acoplamento para o pó de madeira na matriz polimérica, mostram que a presença de grupamentos de anidrido maleico no PEAD-g-MA auxiliam na interação das cadeias do polímero e celulose, contribuindo para uma melhor adesão entre a carga e a matriz [20] . O melhor resultado para a resistência à tração foi obtido com o compósito com a formulação 33M/2MA e para a resistência à flexão foi obtido com o compósito de formulação 24M/4A/2MA, demonstrando que a alumina influi negativamente nos esforços de tração, mas proporciona maior rigidez ao material, aumentando sua resistência à flexão.…”

Section: Resistência Ao Impactounclassified

Avaliação das propriedades mecânicas e morfológicas de compósitos de PEAD com pó de Pinus taeda e alumina calcinada

et al. 2015

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ResumoNeste estudo foram desenvolvidos compósitos utilizando PEAD, pó de madeira (Pinus taeda), alumina calcinada e dois diferentes tipos de agentes compatibilizantes para avaliação das propriedades morfológicas e mecânicas dos mesmos. Para aumentar a interação entre a matriz polimérica e o pó de madeira foram utilizados 2% de polietileno graftizado com anidrido maleico em todas as formulações. Para efeito comparativo foi desenvolvida uma formulação com viniltrietoxisilano como compatibilizante para a alumina calcinada. O teor de cargas variou de 4% a 33% para os compósitos de carga única e mantiveram o percentual de 28% para os compósitos com as duas cargas. A interação entre a matriz polimérica e as cargas, proporcionada pelo agente compatibilizante anidrido maleico, foi observada nas micrografias da interface da matriz/carga. A utilização do silano não proporcionou efeito adicional nas propriedades mecânicas dos compósitos. Os compósitos isentos de alumina apresentaram maior resistência à tração, porém na resistência à flexão a presença da alumina contribuiu para o aumento desta propriedade provavelmente devido à pequena interação existente entre a interface do seu grão e a matriz polimérica. Palavras-chave: compósito, PEAD, pó de madeira, alumina calcinada, anidrido maleico. AbstractThis work aims at the evaluation of morphological and mechanical properties of HDPE composites developed with wood flour (Pinus taeda), calcined alumina and two different types of compatibilizing agents. In order to improve the interaction between the polymer matrix and wood flour 2% maleic anhydride-grafted polyethylene was used in all formulations. For comparison a formulation with triethoxyvinylsilane as compatibilizer for the calcined alumina was developed. The filler content ranged from 4% to 33% for the single filler composite while the percentage of 28% was kept as such for the two-fillers composites. The interaction between the polymer matrix and fillers, provided by the maleic anhydride compatibilizer agent, could be observed in the micrographs of the matrix / filler interface. The silane did not improve the mechanical properties of the composite. Free alumina composites showed higher tensile strength, but concerning flexural strength the presence of alumina contributed to increased values in this property. This was probably caused by the reduced interaction between the interface of its grain and the polymer matrix.

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Section: Resistência Ao Impactounclassified

Avaliação das propriedades mecânicas e morfológicas de compósitos de PEAD com pó de Pinus taeda e alumina calcinada

et al. 2015

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“…In general, the addition of 1–3 wt %, based on the total weight of composites of maleic anhydride is able to improve the mechanical properties . Studies have shown that the addition of up to 50% eucalyptus powder into low density polyethylene (LDPE) compatibilized with maleic anhydride was able to improve the mechanical strength of the composite . The WPCs final properties are important to impart reliability in the use of artifacts with recycled materials even if the ecological appeal is currently interesting.…”

Section: Introductionmentioning

confidence: 99%

The physical perspective on the solid and molten states associated with the mechanical properties of eco‐friendly HDPE/Pinus taeda wood‐plastic composites

Grison

Pistor

Scienza

et al. 2015

J of Applied Polymer Sci

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The manufacture of wood plastic composites (WPCs) by reutilizing post-consumed polymeric materials and post-industry wood wastes contributes to reduce the environmental impact and the consumption of virgin plastics. In this work, the influence of interfacial adhesion on the solid and molten states of high density polyethylene (HDPE) containing WPCs wood dust of recycled Pinus taeda (PT) was evaluated. The composites were prepared by extrusion in a twin screw extruder using maleic anhydride as compatibilizer. The samples were analyzed by dynamic-mechanical analysis (DMA), tensile and impact strength measurements, oscillatory rheometry, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). DMA analysis showed increase in module and an improved interface with physical interaction between the WPCs phases. The higher molecular interactivity interface improved the mechanical properties relative to pure HDPE. Melting state analysis showed increased WPCs flow restriction, this feature being correlated with reduction in the molecular degree of freedom during flow, which consequently reduces the crystalline degree changes in microstructure as well as in processing parameters of the material. These results lead to consider the development of an eco-friendly and economic effective technology to reuse abundant recycled solid wastes in a new market. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 42887.

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“…The improvement of tensile and flexural strengths as well as moduli of recycled PE by addition of wood fiber has been previously reported. 15,16 The major issue in obtaining WPC with superior mechanical properties is an adequate interfacial adhesion between hydrophilic fiber and hydrophobic polymer matrix. In a previous work it was reported, that maleic anhydride modified PP with higher grafting capacity as coupling agent provided significant improvement in mechanical properties of rPE/wood flour composite.…”

Section: Resultsmentioning

confidence: 99%

Effect of Virgin Heterophasic Pp Copolymer Content on Moisture Absorption, Thermal and Mechanical Properties of Recycled Polyethylene Wood Flour Composites

Arango¹,

Rodríguez-Llamazares²,

Castaño³

et al. 2014

J. Chil. Chem. Soc.

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The effect of virgin heterophasic PP copolymer (vPP) content on moisture absorption, as well as on thermal and mechanical properties of recycled polyethylene/ wood flour composites was investigated. The polymer matrix of recycled post-consumed plastic waste (rPE) was composed of a matrix of LDPE and a part of PP. Wood flour of Pinus radiata was used as filler at a constant loading of 45 wt.%. rPE/vPP blends and their composites were manufactured by melt blending, and then by injection molding. The morphology of the blends and composites was analyzed by means of scanning electron microscopy. The addition of vPP improved tensile and flexural moduli and flexural strength of wood plastic composites (WPC). The highest increase of these properties was observed for a WPC sample with a rPE/vPP ratio of 19. WPC made with higher virgin PP content (rPE/vPP ratio = 9 and 5.7) showed lower increase of mechanical properties compared to polymer matrix and WrPE samples. The moisture uptake of WPC made of rPE/vPP blend was higher than those of rPE, and their mechanical properties were more adversely affected by immersion in water. TGA results indicate that rPE are thermally more stable than rPE/vPP blends. The incorporation of heterophasic PP copolymer into the recycled polymer matrix of WPC delays the starting of wood flour degradation.

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Compósitos de polietileno reciclado e partículas de madeira de reflorestamento tratadas com polietileno modificado

Cited by 13 publications

References 13 publications

Avaliação das propriedades mecânicas e morfológicas de compósitos de PEAD com pó de Pinus taeda e alumina calcinada

Avaliação das propriedades mecânicas e morfológicas de compósitos de PEAD com pó de Pinus taeda e alumina calcinada

The physical perspective on the solid and molten states associated with the mechanical properties of eco‐friendly HDPE/Pinus taeda wood‐plastic composites

Effect of Virgin Heterophasic Pp Copolymer Content on Moisture Absorption, Thermal and Mechanical Properties of Recycled Polyethylene Wood Flour Composites

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