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Molecular Level Understanding of Polyethylene Terephthalate (PET) Depolymerization in Base/Alcohol Hybrid Systems
Hyejin Yu1, Younghoon Oh2, Yu Lim Kim3
1Applied Materials Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States.
ACS Applied Materials & Interfaces
|March 27, 2025
Summary
Alkoxide ions are more reactive than hydroxide ions in breaking down polyethylene terephthalate (PET) using base/alcohol systems. Longer-chain alcohols improve PET depolymerization efficiency by enhancing interactions, offering a sustainable recycling pathway.
Area of Science:
- Chemical Recycling
- Polymer Chemistry
- Sustainable Materials
Background:
- Chemical recycling of polyethylene terephthalate (PET) waste is crucial for sustainability.
- Base/alcohol hybrid systems offer a low-energy route for PET depolymerization.
Purpose of the Study:
- Investigate the mechanistic pathways of PET depolymerization in NaOH/alcohol solutions.
- Clarify the roles of hydroxide and alkoxide species in the process.
- Determine factors influencing PET depolymerization efficiency and pathways.
Main Methods:
- Experimental techniques
- Density Functional Theory (DFT) calculations
- Molecular Dynamics (MD) simulations
Main Results:
- Alkoxide ions (RO-) are more reactive than hydroxide ions (HO-) in PET depolymerization.
- Longer-chain alcohols, like 1-butanol, enhance PET conversion through increased interactions.
- PET depolymerization depends on alkoxide concentration and alkoxide-PET interactions, not just activation energies.
Conclusions:
- Alkoxide reactivity and alcohol chain length are key factors in efficient PET depolymerization.
- Long-chain alcohols provide a safer, more sustainable alternative for PET recycling.
- This study offers molecular insights for optimizing sustainable PET chemical recycling.
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