Modeling the Kinetics of Polyethylene Terephthalate and Polyesters with Terminal Hydroxyl Groups Transesterification Reactions DOI Open Access
Kirill Kirshanov, Р. В. Томс, Gadir Sh. Aliev

et al.

Polymers, Journal Year: 2025, Volume and Issue: 17(7), P. 992 - 992

Published: April 6, 2025

Interchain exchange, proceeded by the transesterification mechanism, allows one to obtain polyethylene terephthalate-based polyester products, bypassing stage of molecular weight reduction and polycondensation used in classical methods chemical recycling. A kinetic model is presented, which describes change concentrations bound terminal units ethylene glycol from PET another polyester, as well free molecules glycol, during reactions for first time. Experimental data on dependence degree randomness conversion timeduring interaction terephthalate oligodiethylene with hydroxyl groups a number-average 860 g/mol different ratios were obtained. Molecular characteristics products oligoesters end group interchain weights 610 g/mol, also investigated. The simulation results compared published time ether exchange PET/PEN blends. developed was found be agreement experimental data.

Language: Английский

Upcycling of waste polyester for the development of circular economy DOI

Huaiyuan Zhao,

Yingdan Ye,

Yibin Zhang

et al.

Chemical Communications, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Progress in chemical recycling of waste polyesters (waste plastic refinery) was reviewed and prospected, newly reported thermal catalysis, photocatalysis, electrocatalysis, biocatalysis the recycle PET-based product were introduced.

Language: Английский

Citations

4
Accessing a Carboxyl‐Anhydride Molecular Switch‐Mediated Recyclable PECT Through Upcycling End‐of‐Use PET DOI Open Access
Hongjie Zhang,

Mingyuan Fang,

Sijie Niu

et al.

Angewandte Chemie International Edition, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 6, 2025

Poly(ethylene terephthalate) (PET), with an annual production of exceeding 70 million tons, is mainly utilized in disposable fields and subsequently contribute to severe environmental pollution. Conventional chemical recycling, which typically involves depolymerizing polymer into monomers, limited due the intricate recycling process, excess using unrecyclable solvents low conversion. Inspired by protein's molecular switches, we propose a novel polymer-to-polymer strategy based on polycondensation principles upcycling waste PET high-value recyclable poly(ethylene-co-1,4-cyclohexanedimethanol derivatives containing switches. Upon deactivating switch, acidification reaction occurs within system, leading rapid controllable reduction weight imbalance reactive group. Conversely, activating switch triggers ring-closing that detaches acid anhydrides, bringing about equal molar ratio groups thereby facilitating increase weight. By simply incorporating condensation products melt polycondensation, closed-loop capability achieved without necessitating excessive organic or complex depolymerization processes. The present study not only presents pathway for end-of-use but also introduces innovative concept switching recyclability polymers, demonstrating significant potential large-scale implementation.

Language: Английский

Citations

0
Accessing a Carboxyl‐Anhydride Molecular Switch‐Mediated Recyclable PECT Through Upcycling End‐of‐Use PET DOI Open Access
Hongjie Zhang,

Mingyuan Fang,

Sijie Niu

et al.

Angewandte Chemie, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 6, 2025

Abstract Poly(ethylene terephthalate) (PET), with an annual production of exceeding 70 million tons, is mainly utilized in disposable fields and subsequently contribute to severe environmental pollution. Conventional chemical recycling, which typically involves depolymerizing polymer into monomers, limited due the intricate recycling process, excess using unrecyclable solvents low conversion. Inspired by protein's molecular switches, we propose a novel polymer‐to‐polymer strategy based on polycondensation principles upcycling waste PET high‐value recyclable poly(ethylene‐ co ‐1,4‐cyclohexanedimethanol derivatives containing switches. Upon deactivating switch, acidification reaction occurs within system, leading rapid controllable reduction weight imbalance reactive group. Conversely, activating switch triggers ring‐closing that detaches acid anhydrides, bringing about equal molar ratio groups thereby facilitating increase weight. By simply incorporating condensation products melt polycondensation, closed‐loop capability achieved without necessitating excessive organic or complex depolymerization processes. The present study not only presents pathway for end‐of‐use but also introduces innovative concept switching recyclability polymers, demonstrating significant potential large‐scale implementation.

Language: Английский

Citations

0
Controlled depolymerization of polyethylene terephthalate based on twin-screw extruder and repolymerization of the depolymerized products DOI
Han Wang, Wei Xin, Weizhong Zheng

et al.

Chemical Engineering Science, Journal Year: 2025, Volume and Issue: unknown, P. 121341 - 121341

Published: Feb. 1, 2025

Language: Английский

Citations

0
Upcycling of Waste Plastics into Value-Added Chemicals DOI Creative Commons
Xu Jin, Jing Zhang

Science for energy and environment., Journal Year: 2025, Volume and Issue: unknown, P. 4 - 4

Published: March 27, 2025

Review Upcycling of Waste Plastics into Value-Added Chemicals Jin Xu and Jing Zhang * State Key Laboratory Chemical Engineering, East China University Science Technology, 130 Meilong Road, Shanghai 200237, Correspondence: [email protected] Received: 8 November 2024; Revised: 22 January 2025; Accepted: 24 March Published: 27 2025 Abstract: The rapid increase in plastic production has led to a severe waste crisis, driving the development various recycling technologies mitigate this growing issue. However, these often encounter substantial economic environmental challenges their implementation. An increasingly attractive alternative is chemical upcycling, which can transform plastics value-added chemicals. This review systematically examines upcycling applicable major commercial plastics, including polyethylene terephthalate (PET), polyolefins, polystyrene (PS), polyvinyl chloride (PVC). We focus on key strategies such as solvolysis, catalytic pyrolysis, hydrocracking hydrogenolysis, along with some emerging approaches electrocatalysis photooxidation, aiming summarize trends plastics.

Language: Английский

Citations

0
Modeling the Kinetics of Polyethylene Terephthalate and Polyesters with Terminal Hydroxyl Groups Transesterification Reactions DOI Open Access
Kirill Kirshanov, Р. В. Томс, Gadir Sh. Aliev

et al.

Polymers, Journal Year: 2025, Volume and Issue: 17(7), P. 992 - 992

Published: April 6, 2025

Interchain exchange, proceeded by the transesterification mechanism, allows one to obtain polyethylene terephthalate-based polyester products, bypassing stage of molecular weight reduction and polycondensation used in classical methods chemical recycling. A kinetic model is presented, which describes change concentrations bound terminal units ethylene glycol from PET another polyester, as well free molecules glycol, during reactions for first time. Experimental data on dependence degree randomness conversion timeduring interaction terephthalate oligodiethylene with hydroxyl groups a number-average 860 g/mol different ratios were obtained. Molecular characteristics products oligoesters end group interchain weights 610 g/mol, also investigated. The simulation results compared published time ether exchange PET/PEN blends. developed was found be agreement experimental data.

Language: Английский

Citations

0