Propriedades térmicas de compósitos de acrilonitrila-butadieno-estireno (ABS) e fibras de celulose modificadas com nanopartículas de sílica (SiO2)

Lustosa, Emanuela Camargo de Barros; Menezzi, Cláudio Henrique Soares Del; Luz, Sandra M.; Raabe, Joabel; Jesus, Luiz Carlos Correia de; Leão, Rosineide Miranda; Zattera, Ademir J.

doi:10.1590/s1517-707620200003.1084

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…In the second deposition step (475 to 600 ºC), this is associated with the end of the degradation of acrylonitrile. It was observed that between ~ 200 ºC and 325 ºC other decompositions occur; however, the reactions involved are volatiles that exist in the ABS [36][37][38], similar observations are also described in the literature [39][40][41][42].…”

Section: Thermogravimetric and Calorimetric Analysis (Tga/dsc)supporting

confidence: 80%

Different rotations in the acrylonitrile-butadiene-styrene extrusion process and their influence on fracture and mechanical properties

Neto,

Teixeira Junior,

Costa

et al. 2023

Matéria (Rio J.)

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ABS resins have wide application in the market, mainly in the manufacture of household appliances, telephones, automotive industry and others, and need to be processed by extrusion for the manufacture of products. The variables used in the process of extrusion of polymers have a direct influence on their mechanical properties. The objective of this study was to evaluate the different speeds of the extruder screw (15, 30, 45 and 60 rpm) on the mechanical properties of raw ABS after the extrusion process. Izod impact resistance and tensile tests, were also performed. The fractures of the samples tested by Izod impact were observed via optical microscopy, scanning electronic microscopy (SEM), and roughness was measured. Calorimetric tests (DSC) and thermogravimetry (TGA), as well as melt flow index (MFI), were also performed. The most significant results were observed for the extruder screw speed of 60 rpm. For the impact test, a reduction in impact energy of approximately 3% was observed, with the same result for tensile resistance. However, an increase in the value of the elastic modulus and the MFI was observed due to the increase in the degree of crystallinity, which was caused by the higher shear of the polymer mass in the screw of the extrusion equipment. Additionally, an atypical case occurred for the ABS polymer in the highest rotation, since it was the polymer that suffered the greatest shear in the polymer chains due to the degradation of the butadiene phase.

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Section: Thermogravimetric and Calorimetric Analysis (Tga/dsc)supporting

confidence: 80%

Different rotations in the acrylonitrile-butadiene-styrene extrusion process and their influence on fracture and mechanical properties

Neto,

Teixeira Junior,

Costa

et al. 2023

Matéria (Rio J.)

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Efeito Da Granulometria Nas Propriedades Físico- Mecânico, Morfológicas E Estruturais De Compósitos De Pead Reciclado E Fibras De Sisal

Ferreira¹,

Barros²,

Silva³

et al. 2023

Rev. Contemp.

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O descarte de resíduos plásticos representa uma ameaça ao meio ambiente devido ao longo tempo de degradação. A busca por alternativas que visam a diminuição dos impactos ambientais causados pela geração destes resíduos vem crescendo constantemente. Uma das alternativas é a reciclagem ou a reintrodução desses materiais através da obtenção de materiais compósitos. O polietileno (PE) é um dos materiais que constitui um grande volume de resíduos poliméricos, enquanto a fibra de sisal vem sendo utilizada como reforço em plásticos nos últimos anos. Desta forma, nesse trabalho foram obtidos compósitos de PEAD reciclado e fibras de sisal. As fibras utilizadas foram separadas conforme sua granulometria e foi utilizada a concentração de 5% de fibra para todas as variações granulométricas. Os materiais processados por extrusão foram caracterizados quanto ao índice de fluidez (MFI, ASTM D1238-13), densidade (ASTM D792-13), dureza (ASTM D2240–10), ensaio de temperatura de amolecimento (VICAT), difratometria de raios X (XRD), resistência ao impacto e microscopia eletrônica de varredura (MEV). Os resultados mostraram um aumento no MFI e na dureza e uma redução na densidade. Os valores obtidos no ensaio de temperatura de amolecimento VICAT acompanharam, tendencialmente, os resultados obtidos no ensaio de dureza. A incorporação da fibra, independentemente do tamanho, causou interferência na cristalinidade da matriz polimérica e promoveu uma mudança na superfície dos compósitos. A resistência ao impacto diminuiu com a inserção da fibra de sisal independente da granulometria da fibra.

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Propriedades térmicas de compósitos de acrilonitrila-butadieno-estireno (ABS) e fibras de celulose modificadas com nanopartículas de sílica (SiO2)

Cited by 2 publications

References 9 publications

Different rotations in the acrylonitrile-butadiene-styrene extrusion process and their influence on fracture and mechanical properties

Different rotations in the acrylonitrile-butadiene-styrene extrusion process and their influence on fracture and mechanical properties

Efeito Da Granulometria Nas Propriedades Físico- Mecânico, Morfológicas E Estruturais De Compósitos De Pead Reciclado E Fibras De Sisal

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