Avaliação do uso de poli(tereftalato de etileno) pósconsumo como filamento para impressão 3D

Abstract

This work brings an evaluation of the use of post-consumer poly(ethylene terephthalate) (PET) as a feedstock for additive manufacturing in fused deposition modeling from the comparison among five different filaments used. Three filaments were produced by reactive extrusion of post-consumer PET and different amounts of the chain extensor pyromellitic dianhydride (PMDA), 0%, 0,3% and 0,5%, and two commercial filaments of recycled PET and glycol-modified PET (PETG) were acquired. The five filaments were characterized by melt flow index, differential scanning calorimetry, thermogravimetric analysis and Fourier-transform infrared spectroscopy. The printed specimens were characterized by superficial rugosity, dimensional accuracy, x-ray diffraction, scanning electron microscopy and tensile testing. It was observed that bigger amounts of chain extensor can provide more reproducibility of results, since lower values of standard deviation were obtained, and that the filaments produced with the addition of the chain extensor have the capacity to add value to post-consumer PET since the produced parts presented good mechanical properties compared to parts printed with well-known commercial filaments such as ABS and PLA.