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Boosting thermal stability and crystallization of closed-loop-recyclable biodegradable poly(p-dioxanone) by end-group regulation

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Abstract

A chemically closed-loop-recyclable biodegradable polymer, poly(p-dioxanone) (PPDO), is one of the ideal candidates for single-use plastic products due to its suitability for different application scenarios. Fascinatingly, when PPDO wastes can be collected, its monomer p-dioxanone (PDO) will be obtained through chemical recycling of these wastes; when cannot be collected, the wastes are able to be biodegraded into harmless substances. However, unsatisfied thermal stability and low crystallization rate of PPDO restrict its wider applications. Herein, based on end-group regulation, we simultaneously realized the significant enhancement of thermal stability and crystallization of PPDO through the simple melt processing with tributyl phosphite (TBP) or triphenyl phosphite (TPP). The model reactions were conducted to investigate the reaction mechanism and theoretical products during the preparation of PPDO/phosphite compounds. Two kinds of phosphites were proved to act as the end-capped reagent and chain extender in the melt processing, while TBP presented better reactivity. As a result, the activation energy of thermal decomposition was largely elevated, and the unprecedented T5% (the temperature at a weight loss of 5%) and Tmax (the temperature at a maximum rate of weight loss) of PPDO were obtained, i.e., T5% of ~330 °C and Tmax of ~385 °C in N2 atmosphere, T5% of ~240 °C and Tmax of ~317 °C in air atmosphere, respectively. Furthermore, the increased crystallization rate, crystallinity, crystalline orderliness, and realizable monomer recovery (yield >90%, purity >99.9%) of PPDO/phosphite compounds were confirmed.

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Acknowledgements

This work was supported by the National Key R&D Program of China (2021YFB3801904), the National Natural Science Foundation of China (U19A2095), the Institutional Research Fund from Sichuan University (2020SCUNL205), the Fundamental Research Funds for the Central Universities, and the 111 Project (B20001).

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials (MoE), National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China

    Jin Lei, Zhu-Xin Gui, Wan-Ting Xiong, Gang Wu, Si-Chong Chen & Yu-Zhong Wang

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  1. Jin Lei
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  2. Zhu-Xin Gui
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  3. Wan-Ting Xiong
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  4. Gang Wu
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  5. Si-Chong Chen
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  6. Yu-Zhong Wang
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Correspondence to Gang Wu or Yu-Zhong Wang.

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Conflict of interest The authors declare no conflict of interest.

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Supporting information The supporting information is available online at chem.scichina.com and link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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11426_2023_1732_MOESM1_ESM.pdf

Boosting Thermal Stability and Crystallization of Closed-Loop-Recyclable Biodegradable Poly(p-dioxanone) by End-Group Regulation

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Lei, J., Gui, ZX., Xiong, WT. et al. Boosting thermal stability and crystallization of closed-loop-recyclable biodegradable poly(p-dioxanone) by end-group regulation. Sci. China Chem. 67, 642–651 (2024). https://doi.org/10.1007/s11426-023-1732-1

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  • DOI: https://doi.org/10.1007/s11426-023-1732-1

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