Análise térmica e propriedades mecânicas de resíduos de polietileno de alta densidade (PEAD)

The development of new ecological materials to promote sustainability is being encouraged. Crosslinked biopolyethylene (BioPE)/noni flour (Morinda citrifolia) biocomposites were prepared using maleic anhydride-grafted polyethylene (PE-g-MA) and dicumyl peroxide (DCP). The biocomposites were processed in an internal mixer and injection molded. Torque rheometry, Izod impact strength, tensile strength, heat deflection temperature (HDT), differential scanning calorimetry (DSC), thermogravimetry (TG), and scanning electron microscopy (SEM) properties were investigated. Torque rheometry curves suggest that the biocomposites did crosslink due to the DCP attack on the BioPE chain. The BioPE/noni flour/PE-g-MA formulation with 0.5% and 1% DCP produced a higher level of crosslinking. As a result, the mechanical properties (impact strength, elastic modulus, and tensile strength) were improved. SEM showed fractured noni flour particles in the BioPE matrix with the formation of a tubular structure. The HDT increased, suggesting that the biocomposites exhibit enhanced thermomechanical strength. Furthermore, the biocomposites thermal properties obtained by DSC underwent few modifications. The TG results showed that the crosslinked biocomposites have better thermal stability than the noncrosslinked biocomposites. The crosslinking process of BioPE/noni flour biocomposites with the PE-g-MA/DCP hybrid is an effective way to improve the performance of these materials.

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“… a T m = melting temperature; T C = crystallization temperature; ∆ H m = melting enthalpy; X c = degree of crystallinity, determined by X c = (

\frac{{Δ H}_{normalm}}{W_{PE} \times {normalΔ H}_{normalf 100 %}}

) × 100%, where ∆ H f 100% = melting enthalpy for 100% crystalline polyethylene, 293 J/g. [ 77,78 ] …”

Section: Mechanical Propertiesmentioning

confidence: 99%

Biopolyethylene/Morinda citrifolia cellulosic biocomposites: The impact of chemical crosslinking and PE‐g‐MA compatibilizer

et al. 2021

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“…O PEAD vem tornando-se um dos plásticos mais consumidos no mercado nacional, devido à sua crescente utilização, principalmente no setor de embalagens de rápido descarte. Sua presença nos RSU é estimada em torno de 30% do total dos resíduos plásticos rígidos descartados, perdendo o primeiro lugar apenas para o PET (60%) (COSTA et al, 2016;ZHANG;ZHANG, 2018).…”

Section: Polietileno De Alta Densidade (Pead)unclassified

Compósitos Pead/Bagaço De Cana-De-Açúcar: Influência Do Processamento E Fonte De Pead

et al. 2020

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Neste trabalho, compósitos poliméricos foram produzidos utilizando como matriz polietileno de duas fontes diferentes, o polietileno de alta densidade virgem (PEADv) e o pós-consumo (PEADpc), e como carga, fibras de bagaço de cana-de-açúcar (BCA). Para testar a influência do tipo de processamento, compósitos PEADv/Fibra e PEADpc/Fibra na proporção 90/10 (porcentagem mássica) foram processados em dois equipamentos diferentes: extrusora mono-rosca e extrusora dupla-rosca co-rotatória. Após os processamentos, corpos de prova foram obtidos por compressão e caracterizados por análises de densidade, dureza shore D, índice de fluidez (MFI), absorção de umidade, análise termogravimétrica e calorimetria exploratória diferencial. Os resultados mostram que é possível reduzir a quantidade de polímero oriundo do petróleo, com a inserção de 10 % de um resíduo, que é o bagaço de cana-de-açúcar, sendo os melhores resultados obtidos para compósitos utilizando o 90 % do polímero virgem em extrusora dupla-rosca

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From Waste to Reuse: Manufacture of Ecological Composites Based on Biopolyethylene/wood Powder with PE-g-MA and Macaíba Oil

et al. 2021

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This work aimed to investigate the biopolyethylene (BioPE)/wood powder (WP) composites compatibilized with polyethylene-grafted maleic anhydride (PE-g-MA), using macaíba oil (OM) as a processing aid. The composites were prepared, initially, in an internal mixer and, later, the crushed akes were molded by injection. Mechanical properties (impact, tensile, exural and Shore D hardness), heat de ection temperature (HDT), Vicat softening temperature, differential scanning calorimetry (DSC), thermogravimetry (TG), water absorption, torque rheometry and scanning electron microscopy (SEM) were evaluated. The addition of 30% wood powder to the BioPE matrix increased the elastic modulus (tensile and exural), Shore D hardness and heat de ection temperature (HDT), compared to neat BioPE. These properties were improved when 10% of the PE-g-MA compatibilizer was added, compared to neat BioPE and the non-compatibilized composite. There was a signi cant reduction in the torque of the composites with the addition of macaíba oil, indicating that it improved the processability. In addition, the incorporation of macaíba oil into the composites helped to reduce water absorption, as well as to increase impact strength. SEM micrographs illustrated a greater degree of interfacial adhesion when PEg-MA and macaiba oil were added.

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Análise térmica e propriedades mecânicas de resíduos de polietileno de alta densidade (PEAD)

Cited by 5 publications

References 8 publications

Biopolyethylene/Morinda citrifolia cellulosic biocomposites: The impact of chemical crosslinking and PE‐g‐MA compatibilizer

Biopolyethylene/Morinda citrifolia cellulosic biocomposites: The impact of chemical crosslinking and PE‐g‐MA compatibilizer

Compósitos Pead/Bagaço De Cana-De-Açúcar: Influência Do Processamento E Fonte De Pead

From Waste to Reuse: Manufacture of Ecological Composites Based on Biopolyethylene/wood Powder with PE-g-MA and Macaíba Oil

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