Citation: Beitao Liu, Qi Cao, Jiahui Li, Xigao Jian, Zhihuan Weng. Facile recycling of anhydride-cured epoxy thermoset under mild conditions with multifunctional hydrazine hydrate[J]. Chinese Chemical Letters, ;2023, 34(12): 108465. doi: 10.1016/j.cclet.2023.108465 shu

Facile recycling of anhydride-cured epoxy thermoset under mild conditions with multifunctional hydrazine hydrate

State Key Laboratory of Fine Chemicals, Frontiers Science Center for Smart Materials, Liaoning Technology Innovation Center of High Performance Resin Materials, Department of Polymer Science & Engineering, Dalian University of Technology, Dalian 116024, China

zweng@dlut.edu.cn

Received Date: 28 February 2023
Revised Date: 13 April 2023
Accepted Date: 17 April 2023
Available Online: 18 April 2023

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Environmental economics is accelerating the urgency to develop recycling technologies for the ever-growing quantity of discarded thermoset polymers. Herein, we developed a mild and energy-saving process for high-efficiency degradation and reuse of anhydride-cured epoxy thermoset with the aid of hydrazine hydrate. The degradation degree of the epoxy resin reached 99.6% at 120 ℃ within a short time of 60 min. During the reaction, the ester bonds in the cross-linked network were selectively cleaved by the amination of hydrazine hydrate, and the epoxy resin was fully converted to new monomers that contained hydrazide and hydroxyl groups, respectively. Moreover, the degradation mechanism of the epoxy resin in hydrazine hydrate was studied and a nucleation model was utilized to predict the actual degradation behavior of the system. Finally, the degradation products can be directly mixed with epoxy precursor to prepare a new waterborne epoxy coating with good comprehensive properties. This work not only demonstrates a new way to realize the efficient degradation of epoxy resins, but also provides a facile and efficient recycling protocol for thermosets.
- Anhydride-cured epoxy resin,
- Degradation,
- Recycling,
- Erosion mechanism,
- Waterborne epoxy coating
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