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URI permanente para esta coleçãohttps://repositorio.fei.edu.br/handle/FEI/795
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- 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.
- Investigation on the use of coir fiber as alternative reinforcement in polypropylene(2010) Bettini S.H.P.; Bicudo A.B.L.C.; Augusto I.S.; Antunes L.A.; Morassi P.L.; Condotta R.; Bonse B.C.Polypropylene/coir fiber composites were prepared according to an experimental statistical design, in which the independent variables, coir fiber, and compatibilizer content, were varied. The compatibilizer used was maleic anhydride grafted polypropylene (PP-g-MA). Compatibilizer free composites were also prepared. Composites were processed in a corotating twin-screw extruder and submitted to mechanical and morphological analyses. The effects of the independent variables on the mechanical properties were assessed through tensile strength, elongation at break, flexural modulus, and impact strength. The morphological properties were assessed by scanning electron microscopy (SEM). The results indicated the need for using compatibilizers in the composites due to the incompatibility of PP and coir fiber. The variable with the strongest effect on the properties was coir content, whose increase caused increase in tensile strength, impact strength and elastic modulus, and decrease in elongation at break. The presence of PP-g-MA was fundamental to achieving the aforementioned results. The effect of increasing compatibilizer content was only observed for the elastic modulus. © 2010 Wiley Periodicals, Inc.