Питання хімії та хімічної технології (ННІ УДХТУ)

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ENG: Voprosy Khimii i Khimicheskoi Tekhnologii / Issues of Chemistry and Chemical Technology (USUCT)

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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.
Prediction of the Properties of High-Energy Polymer Materials Based on Oleochemical Products
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Varlan, K.Ye.; Chervakov, Oleh V.; Sukhyy, Kostyantyn M.; Belyanovskaya, Elena A.
ENG: A series of oleochemical products, namely amide derivatives of fatty acids from vegetable oils based on diethanolamine, diethylenetriamine, piperazine, and morpholine, was synthesized. The synthesized products are considered as potential components of mixed solid missile fuels: plasticizers, surfactants, and combustion regulators. To evaluate their applicability, the predicted energy characteristics of mixed compositions containing the synthesized oleochemical products were calculated, including the composition of transformation products, heat of combustion, combustion temperature, and specific volume of combustion products. The method of calculation is presented. The obtained characteristics of the compositions based on oleochemical products are comparable to the calculated values for a known composition based on liquid rubber and dioctyl adipate plasticizer: heat of combustion of 5860 kJ/kg, combustion temperature of 3450 K, and specific volume of combustion products of 0.818 m3/kg.
Prediction of the Properties of High-Energy Polymer Materials Based on Oleochemical Products
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Varlan, K. Ye.; Chervakov, Oleh V.; Sukhyy, Kostyantyn M.; Belyanovskaya, Elena A.
ENG: A series of oleochemical products, namely amide derivatives of fatty acids from vegetable oils based on diethanolamine, diethylenetriamine, piperazine, and morpholine, was synthesized. The synthesized products are considered as potential components of mixed solid missile fuels: plasticizers, surfactants, and combustion regulators. To evaluate their applicability, the predicted energy characteristics of mixed compositions containing the synthesized oleochemical products were calculated, including the composition of transformation products, heat of combustion, combustion temperature, and specific volume of combustion products. The method of calculation is presented. The obtained characteristics of the compositions based on oleochemical products are comparable to the calculated values for a known composition based on liquid rubber and dioctyl adipate plasticizer: heat of combustion of 5860 kJ/kg, combustion temperature of 3450 K, and specific volume of combustion products of 0.818 m3/kg.