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    Influence of Solid-State Polycondensation Conditions on the Intrinsic Viscosity of Recycled Poly(Ethylene Terephthalatе)
    (Ukrainian State University of Science and Technologies, 2026) Chervakov, Denys O.; Ved, Viktor V.; Fedan, V. V.; Sukhyy, Kostyantyn M.; Chervakov, Oleh V.
    ENG: The study investigates the influence of solid-state polycondensation (SSP) conditions on the change in intrinsic viscosity (IV) of recycled poly(ethylene terephthalate) (PET) processed via a bottle-to-bottle technology. Experimental work was carried out within the temperature range of 110–1600C while varying the duration of SSP. It was found that during SSP at 110–1300C, the intrinsic viscosity of PET-BTB increased by 23–34%, whereas the melt flow index (MFI) decreased by up to 54%, indicating a nonlinear relationship between IV and MFI. A mathematical model was proposed to predict IV as a function of temperature, SSP duration, and MFI value. Validation of the model revealed a deviation not exceeding 6%, which confirms its high practical reliability. The proposed approach enables a reduction in the scope of experimental work required for optimizing SSP conditions of recycled PET and assessing its recyclability toward products with the desired level of physical and mechanical properties.