An Integrative Chemical Recycling Approach for Catalytic Oxidation of Epoxy Resin and in situ Separation of Degraded Products

Although many approaches have been proposed to recycling waste epoxy resin (EP), the separation of mixed degraded products remains a challenge due to their similar structures. To address this, we present a catalytic oxidation strategy that enables mild degradation of EP and in situ separation of deg...

Full description

Saved in:
Bibliographic Details
Published in:Angewandte Chemie International Edition 2024-06, Vol.63 (26), p.e202405912-n/a
Main Authors: Liu, Lulu, Liu, Xuehui, Li, Xiaohui, Xu, Shimei, Wang, Yu‐Zhong
Format: Article
Language:English
Subjects:
Catalysts
Catalytic oxidation
Chemical recycling
composites
Degradation
Design for recycling
Electron transfer
epoxy resin
Epoxy resins
Fragments
Functional groups
Iron chlorides
Oxidation
Plastic debris
Plastics recycling
Radicals
Reagents
Recycling
Separation
Solid phases
supramolecular interaction
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Although many approaches have been proposed to recycling waste epoxy resin (EP), the separation of mixed degraded products remains a challenge due to their similar structures. To address this, we present a catalytic oxidation strategy that enables mild degradation of EP and in situ separation of degraded products through supramolecular interactions. The oxidative degradation relies on FeIV=O radicals with strong oxidizing properties, which are generated from the electron transfer of FeCl2 with reaction reagents. As the FeIV=O radicals attacked the C−N bonds of EP, EP was broken into fragments rich in active functional groups. Meanwhile, the FeIV=O radicals were reduced to iron ions that can coordinate with the carboxyl groups on the fragments. As a result, the degraded products with different carboxyl content can be effortlessly separated into liquid and solid phase by coordinating with the catalyst. The success of this work lays the foundation for high‐value application of degraded products and provides new design ideas for recycling waste plastics with complex compositions. A new recycling strategy integrating catalytic oxidation of epoxy resin and in situ separation of degraded products is developed, where the interaction between iron catalyst and reaction solvent makes the degradation under mild condition, while the supramolecular interactions between degraded products and iron catalyst contribute to the separation of mixed degraded products, which provides new ideas for upcycling of mixed plastic wastes.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202405912