Abstract
Goal number 12 of the UN 2030 Agenda for Sustainable Development is sustainable consumption and productions. Recycling has a central role in assuring to meet the target in 2030. Only in EU, the annual total waste of spent tire is 3.7 million tons [1]; it is impelling to find a sustainable way to recycle this material. This article investigates the feasibility of the use of ground tire rubber (GTR) as feedstock for injection molding by blending it with polypropylene (PP). Nine different blends were created by changing the content between rubber and polypropylene and by using three different rubber powders. A particular attention has been paid on the study of the distribution of the rubber particles in the blends. The investigation showed an uneven dispersion between GTR and PP, leading to different surface finishing and mechanical property. From the sulfur combustion analysis it was possible to observe higher content of sulfur, and thus of GTR, in the position of the sample far from the injection gate. Local concentration of rubber powder caused an increase in the surface roughness and a decrease in the hardness of the material.
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