Abstract
The temperatures of phase transitions were analyzed and the ratio of crystalline and amorphous phases was determinedfor polyethylene terephthalate samples involving secondary PET (Vivilen product) and its wastes by methods of differential scanning calorimetry and X-ray structural analysis. The studied polyethylene terephthalate samples were ranked according to their glass transition and melting temperatures, which made it possible to correlate the samples according to the degree of crystallinity.To obtain filament on the basis of dust-like wastes of the solid-phase polycondensation process, the extrusion temperature conditions were justified and filament samples for 3D printing were obtained.
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