Ректорат УДУНТ

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https://crust.ust.edu.ua/handle/123456789/19312
ENG: Rectorate of the USUST

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Browsing Ректорат УДУНТ by Author "Chervakov, Oleh V."

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    The Influence of Solid-State Polycondensation of Polyethylene Terephthalate on Its Rheological Properties
    (Ukrainian State University of Chemical Technology, Dnipro, 2024) Chervakov, Denys O.; Ved, V. V.; Fedan, V. V.; Sukhyy, Kostyantyn M.; Chervakov, Oleh V.
    ENG: The influence of solid-state polycondensation conditions on the rheological properties of polyethylene terephthalate was determined. Mathematical models describing the dependence of the melt flow rate of both virgin and recycled polyethylene terephthalate on the time and temperature of the solid-state polycondensation process were developed. A correlation between the melt flow rate and the average molecular weight of polyethylene terephthalate was demonstrated. Experimental studies showed that conducting solid-state polycondensation of recycled polyethylene terephthalate at temperatures ranging from 130 оC to 160 оC for 3 hours produces polymeric materials with higher molecular weight and, consequently, improved performance properties.
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    Oleochemical Products in Synthesis Technologies of Eco-Friendly Polymers
    (Oles Honchar Dnipro National University, Dnipro, 2024) Chervakov, Oleh V.; Chervakov, Denys O.; Sukhyy, Kostyantyn M.; Kuzminskyi, Vitalii Yu.; Varlan, Kostiantyn Ye.; Belyanovskaya, Elena A.; Levchenko, Yevhenii P.; Yurchik, Mykhailo S.
    ENG: Promising directions of synthesis from renewable vegetable oil raw materials of monomeric and oligomeric oleochemical products are considered: modified triglycerides as ingredients of special-purpose polymer compositions; fatty alcohols, esters and amides of fatty acids as surfactants in detergents, cosmetics, paints, pharmaceuticals, as ecological fuel; polyols and hydroxyl-containing oligomers for the synthesis of polyurethane, polyesteramide, polyurethaneamide binders and coatings with anti-corrosion and antimicrobial properties. The synthesis routes of fatty acid amides, in particular hydroxyl-containing ones with a functionality of 2 or more, as starting compounds for promising polyesteramides are considered in detail. The strategy of synthesis from vegetable oils of saturated polyols with primary hydroxyl groups as promising components for environmentally friendly paint and varnish compositions is considered. Data on the synthesis and properties of polyurethaneamides, polyesteramides and metal-containing derivatives based on them are presented. For each product type an analysis was made of the state of development of a particular technology, as well as future prospects and existing barriers to their development. The possibility of using metal-containing polymers to create biodegradable materials and coatings with hydrophobic properties and antimicrobial activity was shown.
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    Solid-Phase Polycondensation of Polyethylene Terephthalate with Technologies of Its Reactive Extrusion
    (MM Publishing s.r.o., Praha, Czechia, 2023) Rimar, Miroslav; Chervakov, Denys O.; Fedak, Marcel; Kulikov, Andrii; Kulikova, Olha; Sukhyy, Kostyantyn M.; Chervakov, Oleh V.; Bentsionov, Igor; Sverdlikovska, Olga S.; Belyanovskaya, Elena; Yeromin, Oleksandr O.; Prokopenko, Olena M.
    ENG: It has been experimentally confirmed that polyethylene terephthalate during its processing into products destruct without carrying out the process of solid-phase polycondensation. The conditions for both primary and secondary polyethylene terephthalate have been determined for carrying out the process of solid-phase polycondensation for its effective reaction extrusion with chain extenders. To confirm the effectiveness of the parameters of the solid-phase polycondensation process of polyethylene terephthalate, its reaction extrusion was carried out with commercially available chain extenders of the diepoxide class. The optimal content of chain extenders of the diepoxide class for changing the complex of physical, mechanical and rheological properties of polyethylene terephthalate modified by them was determined. It allows obtaining materials with an increased by 2.2 times characteristic viscosity.