Engenharia de Materiais
URI permanente desta comunidadehttps://repositorio.fei.edu.br/handle/FEI/17
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- Influence of reprocessing on the mechanical properties of polyamide 6 containing talc(2016) DOMINGO, G. D.; Adriana Souza© 2016 Author(s).In this study, polyamide 6 containing 30wt% talc was reprocessed via injection molding up to eight processing cycles. The effects of reprocessing on the mechanical properties and on the melt viscosity were analyzed by flexural and impact tests and by melt flow index (MFI) tests, respectively. Flexural strength and modulus remained unchanged up to the 5th processing cycle. From the 6th processing cycle, flexural strength and modulus decrease with increasing processing cycles. Similar trend was observed for impact strength, however, the decrease observed in this property was much lower. From the 6th processing cycle, MFI increases with increasing processing cycles, indicating a possible reduction in PA6 molar mass.
- Mechanical properties of polyamide 12 after exposed to biodiesel(2016-10-31) NASCIMENTO, R. A.; Adriana Souza© 2016 Author(s).In this study, the mechanical properties of polyamide 12 (PA12) exposed to two types of fuel, B5 - market standard diesel with 5% biodiesel and B100 - pure biodiesel were investigated. The PA12 analyzed was a commercial grade VESTAMID®X7393, used for fuel hoses manufacturing. Samples for tensile and impact tests, obtained by injection molding, were immersed in two types of fuel (B5 and B100) contained in opaque vessels. Some vessels were stored at 100°C in an oven and the others were stored at room temperature. After remained immersed for a set time (1000, 3000 and 5000hours), the samples were taken out of the vessels and characterized by mechanical properties (tensile and impact strength). PA12 samples aged in B5 and B100 at 100°C presented a decrease in elongation at break and impact strength and an increase in Young modulus with increasing aging time. The tensile strength of PA12 aged in B5 and B100 decreased and increase, respectively, with increasing aging time. B5 was more aggressive than B100 for PA12. PA12 samples aged in B5 and B100 at room temperature presented a decrease in tensile strength with increasing aging time. From 3000 hours of aging, a decrease in Young modulus and an increase in impact strength was observed. This behavior was more pronounced for samples aged in B100.
- Reusing Ionomer Scraps as Impact Modifier in Polyamide 6(2020) ALMEIDA, L. J. DE; Adriana Souza© 2020, Springer Science+Business Media, LLC, part of Springer Nature.Blends of PA6 and ionomer scraps, with compositions ranging from 5 to 30 wt% ionomer without incorporation of compatibilizer, and blends with 10 and 20 wt% ionomer compatibilized with 2 wt% maleic anhydride grafted polyethylene copolymer (PEgMA) were obtained by extrusion. Their morphology (SEM), mechanical (tensile, flexural and impact tests) and thermal properties (HDT, DSC and TGA tests) were analyzed. The incorporation of ionomer in PA6 promoted an increase in strain at break and impact strength. PEgMA acted positively on these properties, increasing the interaction between the ionomer and PA6 phases. Tensile and flexural strength, tensile and flexural modulus decreased with increasing ionomer concentration. The compatibilizer acted significantly, reducing these properties. The crystallinity and melting temperature of PA6 were not influenced by the incorporation of ionomer and compatibilizer in the blends.