Efeito da adição do copolímero etileno/metacrilato de glicidila (EGMA) nas propriedades reológicas, mecânicas e morfologia do poli (tereftalato de etileno) (PET)
Effect of adding the ethylene/glycidyl methacrylate (EGMA) copolymer on the rheological and mechanical properties, and morphology of poly (ethylene terephthalate) (PET)
Walber Alexandre do Nascimento, Henriqueta Portilho da Silva, Pankaj Agrawal, Tomás Jeferson Alves de Mélo
Resumo
O intuito deste trabalho foi estudar o efeito EGMA nas propriedades reológicas, mecânicas e na morfologia do PET. Diversas composições formuladas com o EGMA e a matriz de PET foram produzidas. Utilizaram-se reometria de torque, FTIR, ensaios mecânicos e MEV para caracterizar as blendas. Os resultados obtidos por reometria de torque indicaram um aumento da amplitude das curvas de torque, e consequentemente da viscosidade do fundido, com o aumento da concentração de EGMA. O FTIR indicou reações ocorridas entre os grupos funcionais do EGMA, com os grupos terminais do PET, sendo esse o fator preponderante para que houvesse aumento do torque na análise por reometria. A propriedade mecânica de RI teve um aumento de quase 8x, quando comparado ao PET puro, apresentando também uma leve redução da rigidez e da RT com o aumento da concentração de EGMA. As análises morfológicas indicaram a formação de uma estrutura miscível/compatível, ou seja, sem evidente separação de fase, o que pode ter corroborado na obtenção da tenacificação do PET como observado também no aumento crescente da RI.
Palavras-chave
Abstract
This work aimed to study the effect of EGMA on the rheological, mechanical, and morphological properties of PET. Several compositions formulated with EGMA and the PET matrix were produced. Torque rheometry, FTIR, mechanical tests, and SEM were used to characterize the blends. The results obtained by torque rheometry indicated an increase in the amplitude of the torque curves, and consequently in the melt viscosity, with the increase in the concentration of EGMA. The FTIR indicated reactions that occurred between the functional groups of EGMA, with the terminal groups of PET, which is the main factor for an increase in torque in the analysis by rheometry. The mechanical property of IS increased almost 8x when compared to pure PET, also showing a slight reduction in stiffness and TS with an increase in the concentration of EGMA. Morphological analyzes indicated the formation of a miscible/compatible structure, that is, without evident phase separation, which may have corroborated in obtaining PET toughening, as also observed in the progressive increase in IS.
Keywords
Referências
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Submetido em:
30/04/2020
Aceito em:
30/10/2020
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