ABSTRACT:The comparison of the degree of crystallinity and the micromechanical properties in the blends of recycled amorphous poly(ethylene terephthalate) (PET) with isotactic polypropylene (iPP) and high-density polyethylene (HDPE) with a compatibilizer in different proportions is reported. The physical study of the composites of the compatibilized blends and clay is also discussed. The analysis, performed by means of wide-angle X-ray scattering and differential scanning calorimetry techniques, permits us to describe, at microscale level, the role of the compatibilizer on the structure and microhardness of the polymer blends that we studied. The results reveal that PET was incompatible with both iPP and HDPE. However, the presence of the compatibilizer, a styrene-ethylene/ butylene-styrene block copolymer grafted with maleic anhydride, allowed the compatibilization of these polymers. In the PET/iPP blends, the clay seemed to have a nucleating effect on the iPP and also induced a hardness increase in the compatibilized blends. On the other hand, in case of PET/ HDPE, the crystallinity of these samples (pure blends, blends with compatibilizer, and blends with compatibilizer plus clay) only depended on their composition. Similarly to the PET/iPP blends, the addition of clay induced an increase in the hardness of the compatibilized blends.
Blends of isotactic polypropylene (iPP) and polycarbonate (PC) with and without a compatibilizer were prepared using a Brabender Haake Rheocord at 260°C and 32 rpm. Maleic anhydride grafted styrene‐ethylene/butylene‐styrene (SEBS‐g‐MAH) and maleic anhydride grafted ethylene–propylene diene (EPDM‐g‐MAH) were chosen as compatibilizers and their proportion was set to 5, 10, and 15 wt%, respectively. The thermal properties and crystallization behavior were determined by differential scanning calorimetry (DSC) and wide angle X‐ray scattering (WAXS). Micromechanical properties were also investigated using a Vickers microindentation tester. The DSC analysis indicates that the melting temperature of iPP in the all the blends, compatibilized and uncompatibilized ones, remains constant and is almost the same as those of the pure component. On the other hand, it is shown that the degree of crystallinity of iPP in the blends calculated by DSC and WAXS is dependent of the composition of the polymeric mixture. However the hardness (H) decreases with increasing PC content until the composition of iPP/PC (75/25) is reached, whereas for larger PC content values, H increases. The same trend was obtained with the addition of both compatibilizers. POLYM. ENG. SCI., 56:1138–1145, 2016. © 2016 Society of Plastics Engineers
In this paper, blends of recycled polyethylene terephthalate (r-PET) and high-density polyethylene (HDPE) with and without a compatibilizer were prepared using a Brabender Haake Rheocord at 270°C and 32rpm. Ethylene vinyl acetate was chosen as the compatibilizer and its proportion was set to 5, 7, and 10 wt%. The thermal properties and crystallization behavior were determined by Differential Scanning Calorimetry (DSC). Micromechanical properties were also investigated using a Vickers microindentation tester. The DSC analysis indicates that the melting temperature of r-PET and HDPE in all the blends, compatibilized and uncompatibilized, remains constant and almost the same as those of the pure component. On the other hand, it is shown that the degree of crystallinity of HDPE in the blends calculated by DSC depends on the composition of the polymeric mixture. However, the Hardness (H) decreases with increasing r-PET content until 50/50 composition of r-PET/HDPE is reached, whereas for larger r-PET content values, H increases. The same trend was obtained with the addition of the compatibilizer.
Blends of polypropylene and high density polyethylene (PP/HDPE) were prepared in the presence of particulate nano-filler calcium carbonate (CaCO 3) treated on the surface with two coupling agents, namely: (organosilane Silquest A-172 and organozirconate Ken-React NZ-12). The structure and properties of the modified blends were investigated by means of differential scanning calorimetry (DSC), wideangle X-ray scattering (WAXS), and macro-and micro-mechanical measurements. The crystallinity of the modified samples (PP, HDPE and their blends) does not seem to be so much affected by the presence of the filler. The study of thermal properties by differential calorimetric analysis (DSC) indicates that the melting temperature varies slightly with the filler content. The presence of coupling agents promotes the development of spherulites by causing a slight increase in crystallinity levels. The addition of the treated or untreated filler to the mixtures increases impact strength and Young's modulus. The micromechanical results show that the microhardness of the PP/HDPE blends notably increases with the PP content. The micromechanical properties of the modified blends only improve slightly as a consequence of the addition of the treated filler with the coupling agents.
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