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.
The vulcanized residue of styrene-butadiene rubber (SBRr) is a raw material with potential for re-addition in the production chain, adding value and reducing environmental impact. Polypropylene (PP) compounds with SBRr from the footwear industry were produced, adding styrene-(ethylene-butylene)styrene (SEBS) as compatibilizer, with 20% and 30% of styrene (St.). Addition of 30% SBRr did not compromise the processability, since the torque and ow index increased slightly. Signi cant increases in impact strength were achieved for PP/SBRr/SEBS (10% -20% St.) and PP/SBRr/SEBS (10% -30% St.), with gains of 316% and 248%, related to PP. The elastic modulus, tensile strength, elongation at break and Shore D hardness indicated greater exibility for the PP/SBRr/SEBS, especially in the copolymer with 20% St. The thermal de ection temperature (HDT) indicated that even adding high content of SBRr to PP, the HDT was not severely affected, possibly due to its crosslinked character. PP/SBRr compatibilization with SEBS (20% St.) inhibited the PP crystalline peaks, as veri ed through X-ray diffraction (XRD). Stable morphology was achieved upon 10% of SEBS addition to PP/SBRr, providing proper interfacial adhesion and ne particles, contributing to toughen PP. Acquired results are promising for the rubber recycling, aiming at the production of high-impact polypropylene for containers and furniture accessories applications.vulcanized rubber residues. In this case, the infusible rubber powder disperses within PP matrix, acting as exible ller and promoting toughening. Costa et al.[17] evaluated the potential of waste tire rubber (SBR-styrene-butadiene) as a complementary raw material for the PP/ethylene-propylene-diene rubber (EPDM) system. The PP/EPDM/SBR compounds were prepared using a co-rotating twin screw extruder and specimens were injection molded. SBR addition to PP matrix did not result in an increase in impact strength nor in elongation at break, only a slight reduction in these properties, which is attributed to insu cient adhesion between the two phases.However, high values of impact strength were reached (> 80 J.m − 1 ), for PP/EPDM/SBR with EPDM and SBR contents around 25%. Elastic modulus and tensile strength decreased with increasing concentration of EPDM or SBR, due to increased exibility. EPDM developed improved non-adhesion between two distinct phases (PP and SBRr), leading to improved elongation at break results.Ciro et al. [18] developed PP compounds with recycled rubber (BR), in the range of 10-55% of BR weight, processed using an internal mixer. Rheometry plots displayed slight increase in torque upon BR increasing, suggesting an increase in viscosity. The increase in BR concentration reduced the elastic modulus and tensile strength, especially promoting a severe reduction in these properties at 55% BR. The thermogravimetry (TG) results showed that PP/BR compounds thermal stability decreased upon BR addition, compared to neat PP. DSC scans showed evidence that recycled rubber addition to PP affected the crystalli...
A produção de materiais ecológicos está sendo incentivada, visando minimizar os impactos ambientais e promover uma maior sustentabilidade. Portanto, esse trabalho, teve como objetivo desenvolver biocompósitos de biopolietileno (BioPE)/farinha de madeira (FM), utilizando como compatibilizante o polietileno enxertado com anidrido maleico (PE-g-MA). Os biocompósitos foram preparados em uma extrusora de rosca dupla corrotacional e moldados por injeção. As propriedades de resistência ao impacto Izod, resistência à tração, Dureza Shore D, Temperatura de Deflexão Térmica (HDT) e absorção de água foram investigadas. A resistência ao impacto aumentou quando o biocompósito BioPE/FM foi compatibilizado com PE-g-MA. Esse acréscimo foi mais expressivo para 10% de PE-g-MA com alto grau de enxertia de anidrido maleico, indicando um maior nível de interação entre as fases. Os biocompósitos BioPE/FM/PE-g-MA apresentaram propriedades de módulo elástico, resistência à tração, dureza Shore D e HDT aprimoradas, em comparação ao biocompósito não compatibilizado. Um aspecto importante foi a redução da absorção de água para os biocompósitos compatibilizados com PE-g-MA, sugerindo um maior efeito barreira para a difusão de umidade. Do ponto de vista do grau de enxertia de anidrido maleico no PE-g-MA, em geral, a resistência ao impacto foi a propriedade mais sensível. Os resultados indicam que a farinha de madeira é um resíduo com potencial para ser reaproveitado no desenvolvimento de biocompósitos.
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 flakes were molded by injection. Mechanical properties (impact, tensile, flexural and Shore D hardness), heat deflection 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 flexural), Shore D hardness and heat deflection 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 significant 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 PE-g-MA and macaiba oil were added.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
334 Leonard St
Brooklyn, NY 11211
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.