Robust Epoxy Resins with Autonomous Visualization of Damaging-Healing and Green Closed-Loop Recycling

Robust Epoxy Resins with Autonomous Visualization of Damaging-Healing and Green Closed-Loop Recycling

2024 | Xuewei Jiao, Yaning Ma, Zihan Zhao, Liang Gao, Baoyan Zhang, Jigang Yang, Min-Hui Li, Jun Hu
This study presents a high-performance epoxy resin, TDS, featuring dynamic ester and disulfide bonds, which exhibits superior mechanical properties and autonomous visualization of damage and healing. The TDS resin demonstrates high tensile strength (66.6 MPa) and modulus (2.63 GPa), flexural strength (103.2 MPa) and modulus (3.52 GPa), and a glass transition temperature (Tg) of 133°C. The reversible transformation between aromatic disulfide bonds and thiyl radicals enables autonomous visualization of damage and healing. Additionally, the harmonious interplay between disulfide and ester bonds, promoted by tertiary amine, facilitates topological network rearrangements, allowing TDS to easily reshape, weld, degrade, and recycle. TDS can be completely degraded in pure water at 200°C without any catalyst, and the degraded products can be directly re-polymerized to achieve green closed-loop recycling. This work proposes a simple and economical strategy for the development of functional and sustainable epoxy resin-based engineering plastics. The TDS resin also exhibits UV-shielding ability and can be used for anti-counterfeiting applications. The study highlights the potential of TDS as a multifunctional material with applications in various fields, including aerospace, microelectronics, and sustainable materials. The TDS resin shows excellent thermal and mechanical properties, and its dynamic network performance allows for shape-shifting and re-shaping at different temperatures. The TDS resin also has the ability to self-report damage and heal, making it a promising material for smart and sustainable applications. The study demonstrates the potential of TDS as a sustainable and functional material with applications in various fields.This study presents a high-performance epoxy resin, TDS, featuring dynamic ester and disulfide bonds, which exhibits superior mechanical properties and autonomous visualization of damage and healing. The TDS resin demonstrates high tensile strength (66.6 MPa) and modulus (2.63 GPa), flexural strength (103.2 MPa) and modulus (3.52 GPa), and a glass transition temperature (Tg) of 133°C. The reversible transformation between aromatic disulfide bonds and thiyl radicals enables autonomous visualization of damage and healing. Additionally, the harmonious interplay between disulfide and ester bonds, promoted by tertiary amine, facilitates topological network rearrangements, allowing TDS to easily reshape, weld, degrade, and recycle. TDS can be completely degraded in pure water at 200°C without any catalyst, and the degraded products can be directly re-polymerized to achieve green closed-loop recycling. This work proposes a simple and economical strategy for the development of functional and sustainable epoxy resin-based engineering plastics. The TDS resin also exhibits UV-shielding ability and can be used for anti-counterfeiting applications. The study highlights the potential of TDS as a multifunctional material with applications in various fields, including aerospace, microelectronics, and sustainable materials. The TDS resin shows excellent thermal and mechanical properties, and its dynamic network performance allows for shape-shifting and re-shaping at different temperatures. The TDS resin also has the ability to self-report damage and heal, making it a promising material for smart and sustainable applications. The study demonstrates the potential of TDS as a sustainable and functional material with applications in various fields.
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Understanding Robust Epoxy Resins with Autonomous Visualization of Damaging%E2%80%90Healing and Green Closed%E2%80%90Loop Recycling