Polietileno de Alta Densidade Tenacificado com Elastômero Metalocênico: 1. Propriedades Mecânicas e Características Morfológicas

Guimarães, Marcos Duarte; Rocha, Marisa Cristina Guimarães; Coutinho, Fernanda M. B.

doi:10.1590/s0104-14282002000200006

Cited by 9 publications

(4 citation statements)

References 22 publications

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“…Binary blends with 20 and 30% PCL exhibited a typical behavior of tough material, providing increases around 88.2% for Bio-PE/PCL (80/20 w/w) and 83.2% for Bio-PE/PCL (70/30 w/w) related to Bio-PE. Most of this trend is associated to the increase of PCL content in the mixture, since it presents elastomeric characteristics, being able to act as an impact modifier, promoting an enhancement of the system impact strength (Guimarães et al, 2002;Deblieck et al, 2011;Silva, 2014;Fel et al, 2016;Chudnovsky and Sehanobish, 2017;Agrawal et al, 2018). Table 3 shows a similar behavior for the ternary blends compared to the binary ones.…”

Section: Impact Strength Measurementsmentioning

confidence: 99%

Toughening of bio-PE upon addition of PCL and PEgAA

et al. 2019

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Researches of polymer blends based on biological and biodegradable polymers appear as a viable alternative to develop environmentally friendly materials. Therefore, the aim of this research was to produce compounds made with biological polyethylene, i.e., Biopolyethylene, Bio-PE, added to the biodegradable Polycaprolactone (PCL) and functionalized by the copolymer of polyethylene grafted with acrylic acid (PEgAA), to obtain better mechanical properties and toughen Bio-PE. Compounds were processed in a co-rotating twin screw extruder and sample tests were injection molded. The compositions investigated were: Bio-PE/PCL at 90/10, 80/20 and 70/30 wt.% without compatibilizer and upon addition of 10 phr (parts per hundred of resin) of PEgAA. The blends were characterized by X-ray diffraction (XRD), impact strength, heat deflection temperature (HDT) and scanning electron microscopy (SEM). Through XRD, it was observed that addition of PCL and PEgAA did not significantly change Bio-PE diffraction patterns. Impact strength data showed that the blends presented a tougher behavior upon addition of PCL and PEgAA. The HDT of compatibilized blend with 20wt.% of PCL was slightly higher. SEM images of compatibilized blends showed lower average particle diameters as well as absence of coalescence and aggregates.

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Section: Impact Strength Measurementsmentioning

confidence: 99%

Toughening of bio-PE upon addition of PCL and PEgAA

et al. 2019

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“…On the other hand, blends with 20% and 30% PCL showed higher impact strength with increases of 88.2% for Bio-PE/PCL (80/20) and 83.2% for Bio-PE/PCL (70/30). This increase may be related to the PCL effect that presents elastomeric characteristics, being able to act as a properly impact modifier, thus promoting a significant improvement in the energy absorption mechanisms of the produced blends in this work [33,38,41] . The addition of PEgMA also contributed to increase the impact strength, where increases of 133.2% for Bio-PE/PCL/PEgMA (80/20/10 phr) and 100.3% for Bio-PE/PCL/PEgMA (70/30/10 phr) were reached.…”

Section: Impact Strengthmentioning

confidence: 99%

Compatibility and characterization of Bio-PE/PCL blends

et al. 2019

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In this work, blends based on environmentally friend polymers such as Biopolyethylene (Bio-PE), Polycaprolactone (PCL) and Polyethylene graft maleic anhydride (PEgMA) added as compatibilizer agent were produced by conventional extrusion, aiming to produce bio-blends with synergic properties at low processing cost, being at same time non-polluting and therefore contributing to the environment preservation. Differential scanning calorimetry (DSC) showed that blending does not significantly interfere on the melting and crystallization behaviors of neat polymers, suggesting being low miscibility compounds. Mechanical properties were observed changing with blend composition as the impact strength significantly increased reaching values higher than 130% when compared to neat Bio-PE. Scanning electron microscopy (SEM) images showed honeycomb morphology in Bio-PE/PCL blends, and the addition of PEgMA decreased the coalescence contributing to obtain more stable and synergic compounds. Bio-PE/PCL/PEgMA at 80/20/10 contents presented the best properties and may be used for packaging materials (food containers, film wrapping), and hygiene products.

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“…Nas misturas de termoplásticos reforçados com elastômeros, quando se aplica uma tensão, as partículas elastoméricas dispersas concentram ou absorvem essa tensão, provocando uma alteração do estado de tensão da fase matricial, e uma intensa deformação plástica. A absorção-dissipação de energia pelas partículas dispersas se processa por diferentes mecanismos, tais como, cavitação (ruptura), deformação plástica (escoamento), ou por duplo processo de cavitação-deformação (COUTINHO et al, 2007;ROCHA;COUTINHO, 2002;WANG et al, 1998 Boondamnoen et al (2012) prepararam blendas de poliestireno com resíduos de borracha natural, bem como borracha vulcanizada nas proporções de 50/50% em peso. O objetivo dos autores era comparar as propriedades de resistência à tração e da morfologia.…”

Section: Introductionunclassified

Efeito do Compatibilizante SBS e da Granulometria nas Propriedades Mecânicas de Blendas de PS/Resíduo de Borracha (SBRr)

et al. 2014

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Uma forma de modificar as propriedades de sistemas poliméricos é a mistura física de mais de um polímero, ou seja, as blendas poliméricas. Pretende-se com este trabalho produzir blendas poliméricas a partir de uma matriz de poliestireno com resíduos de borracha, visando estudar o efeito da granulometria e do compatibilizante nas propriedades mecânicas de impacto e tração. As blendas de poliestireno/ resíduos de borracha, inicialmente foram preparadas em uma extrusora de rosca dupla corrotacional e, posteriormente, os grânulos extrusados foram moldados por injeção. Ficou evidenciado que 5% em peso do compatibilizante SBS otimizou os resultados de resistência ao impacto para as blendas ternárias. O módulo de elasticidade dos sistemas diminuiu em relação ao módulo da matriz pura de poliestireno. A granulometria só influenciou de forma significativa na propriedade de resistência ao impacto para as blendas compatibilizadas, sendo a granulometria mais fina a que apresentou melhores resultados. Estes resultados evidenciam uma boa alternativa de tenacificação do poliestireno, bem como reduzir custos utilizando resíduos de borracha que seriam descartados Palavras-chave: Blendas poliméricas. Tenacificação. Compatibilizante. Granulometria.

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Polietileno de Alta Densidade Tenacificado com Elastômero Metalocênico: 1. Propriedades Mecânicas e Características Morfológicas

Cited by 9 publications

References 22 publications

Toughening of bio-PE upon addition of PCL and PEgAA

Toughening of bio-PE upon addition of PCL and PEgAA

Compatibility and characterization of Bio-PE/PCL blends

Efeito do Compatibilizante SBS e da Granulometria nas Propriedades Mecânicas de Blendas de PS/Resíduo de Borracha (SBRr)

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