Сучасне уявлення про перебіг процесів деструкції поліетилентерефталату
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Date
2023
Journal Title
Journal ISSN
Volume Title
Publisher
Дніпровський національний університет імені Олеся Гончара, Дніпро
Abstract
UKR: У даній роботі, наведена інформація щодо сучасних уявлень про перебіг процесів деструкції поліетилентерефталату. Представлено загальні уявлення про механізми гідролітичної, термічної, термоокислювальної, термомеханічної та фотодеструкції поліетилентерефталату. Аналізуючи достатньо широкий ряд джерел літератури, встановлено, що деструкція поліетилентерефталату під впливом вологи, температури та навантажень зсуву, відбувається за декількома механізмами та має автокаталітичний характер. В ході гідролітичної деструкції поліетилентерефталату утворюються його полімерні та/або олігомерні похідні з гідроксильними, карбоксильними та вінілестерними групами, етилен, ацетальдегіди і циклічні сполуки.
ENG: This work provides information about the current understanding of polyethyleneterephthalate destruction. It presents overall concepts about the mechanisms of hydrolytic, thermal, thermo-oxidative, thermomechanical and photo- destruction of polyethyleneterephthalate. By analyzing a wide range of literature sources, it was found that the degradation of polyethylene terephthalate occurs by many mechanisms and almost always causes an autocatalytic process of its degradation (hydrolysis) with the formation of polymeric and/or oligomeric derivatives with hydroxyl, carboxyl and vinyl ester groups, ethylene, acetaldehyde and cyclic compounds. It has been shown that the initiation temperature of hydrolytic degradation is 100–120 ˚C and the rate of hydrolytic degradation is ~10000 time faster than its thermal and thermo-oxidative destruction. It was determined that during thermal degradation, the PET chain breaks by a mechanism that differs from the mechanism of its hydrolytic degradation and is accompanied by the formation of PET derivatives with different end groups. However, without oxygen, thermal degradation is 3 times faster than in its presence. All products formed during thermo mechanical degradation are chromatophores, leading to color changes and reducing the colorability of PET recycled products. Photodestruction of PET is based on the mechanism of the Norrish photochemical reaction and is divided into 2 types – Norrish type 1 and Norrish type 2.
ENG: This work provides information about the current understanding of polyethyleneterephthalate destruction. It presents overall concepts about the mechanisms of hydrolytic, thermal, thermo-oxidative, thermomechanical and photo- destruction of polyethyleneterephthalate. By analyzing a wide range of literature sources, it was found that the degradation of polyethylene terephthalate occurs by many mechanisms and almost always causes an autocatalytic process of its degradation (hydrolysis) with the formation of polymeric and/or oligomeric derivatives with hydroxyl, carboxyl and vinyl ester groups, ethylene, acetaldehyde and cyclic compounds. It has been shown that the initiation temperature of hydrolytic degradation is 100–120 ˚C and the rate of hydrolytic degradation is ~10000 time faster than its thermal and thermo-oxidative destruction. It was determined that during thermal degradation, the PET chain breaks by a mechanism that differs from the mechanism of its hydrolytic degradation and is accompanied by the formation of PET derivatives with different end groups. However, without oxygen, thermal degradation is 3 times faster than in its presence. All products formed during thermo mechanical degradation are chromatophores, leading to color changes and reducing the colorability of PET recycled products. Photodestruction of PET is based on the mechanism of the Norrish photochemical reaction and is divided into 2 types – Norrish type 1 and Norrish type 2.
Description
К. Сухий: ORCID 0000-0002-4585-8268
Keywords
поліетилентерефталат, гідролітична деструкція, термодеструкція, термоокиснювальна деструкція, термомеханічна деструкція, фотодеструкція, polyethylene terephthalate, hydrolytic degradation, thermal degradation, thermo-oxidative degradation, thermomechanical degradation, photodegradation
Citation
Черваков Д. О., Сухий К. М., Черваков О. В., Свердліковська О. С. Сучасне уявлення про перебіг процесів деструкції поліетилентерефталату. Journal of Chemistry and Technologies. 2023. Т. 31, № 3. С. 522–529. DOI: https://doi.org/10.15421/jchemtech.v31i3.285240.