Influência da argila bentonita nas propriedades de compósitos a partir de blendas PEAD reciclado/PET pós consumo

Abstract

In the present work, the compatibilization effect of high-density polyethylene/Poly (ethylene terephthalate) (HDPE/PET) blends was investigated through the incorporation of the organophilized clay mineral Bentonite (Bento). This study was carried out through the incorporation of clay concentrations into HDPE/PET blends, composition of 50/50% w/w. The polymeric blends were processed by extrusion and subsequently characterized. Analyzes such as density, hardness, flow index (MFI), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were performed. The density analysis indicated an increase for the compatibilized samples when compared to the sample without compatibilizer, however, there was a small reduction for the sample with 15% Bento. The hardness analysis showed the same behavior, indicating that the ideal maximum would be 10% Bento. The melt flow index showed a slight reduction for all composites. In the XRD analysis, it was observed that the intense peaks are well defined, which clearly shows the existence of crystallinity in all the systems samples. The bentonite showed no peak in the HDPE/PET/Bento composites, suggesting a possible intercalation/exfoliation of the clay layers in the HDPE/PET matrix. The FTIR analysis showed that the addition of inorganic filler to the polymeric mixture did not promote the appearance of new absorption bands, suggesting that there is a simple physical mixture without chemical reactions involved. The SEM analysis of the composites confirms the hypothesis of some compatibilization