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Fabricating a Repairable, Recyclable, Imine-based Dynamic Covalent Thermosetting Resin with Excellent Water Resistance by Introducing Dynamic Covalent Oxime Bonds.

The sustainable production of adaptive, recyclable and imine-based dynamic covalent thermosetting resins presents an opportunity for polymer scientists to address the prevalent environmental and energy concerns associated with current petroleum-based plastics. However, the imine-based dynamic covalent thermosetting resins (DCTR) easily decompose in the presence of water, and which can weak mechanical properties in imine-based polymers. In this study, we designed oxime-imine dynamic covalent thermosetting resins that are stable in the presence of water and exhibit good mechanical properties. In the presence of one kind of amino group catalyst, the oxime-imine dynamic covalent thermosetting resins were able to be completely recycled. Additionally, these well-designed oxime-imine dynamic covalent thermosetting resins have distinguished mechanical properties, high glass transition temperatures (166 °C), and good thermal stabilities. Taken together, this work offers a sustainable solution for the design and manufacture of high-value degradable materials intended for applications in which recyclability and reusability are indispensable.