Étude des effets du recyclage sur les propriétés mécaniques thermiques et rhéologiques du PET

Abstract

At the end of this work, which included rheological, mechanical, thermal, and spectral studies, we can draw the following conclusions: Shear stress increases slightly with increasing shear rate and decreases with increasing number of extrusion cycles. The significant drop in viscosity with increasing number of extrusion cycles is directly related to various degradation processes, primarily thermal, thermo-oxidative, and mechanical degradation, which largely contributed to the reduction in molecular mass through polymer chain breakage during repeated extrusions.