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Dynamic multiphase semi-crystalline polymers based on thermally reversible pyrazole-urea bonds

Author

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  • Wen-Xing Liu

    (Chinese Academy of Sciences
    University of Geneva)

  • Zhusheng Yang

    (Chinese Academy of Sciences)

  • Zhi Qiao

    (Chinese Academy of Sciences)

  • Long Zhang

    (Tsinghua University)

  • Ning Zhao

    (Chinese Academy of Sciences)

  • Sanzhong Luo

    (Tsinghua University)

  • Jian Xu

    (Chinese Academy of Sciences)

Abstract

Constructing responsive and adaptive materials by dynamic covalent bonds is an attractive strategy in material design. Here, we present a kind of dynamic covalent polyureas which can be prepared from the highly efficient polyaddition reaction of pyrazoles and diisocyanates at ambient temperature in the absence of a catalyst. Owing to multiphase structural design, poly(pyrazole-ureas) (PPzUs) show excellent mechanical properties and unique crystallization behavior. Besides, the crosslinked PPzUs can be successfully recycled upon heating (~130 °C) and the molecular-level blending of polyurea and polyurethane is realized. Theoretical studies prove that the reversibility of pyrazole-urea bonds (PzUBs) arises from the unique aromatic nature of pyrazole and the N-assisting intramolecular hydrogen transfer process. The PzUBs could further broaden the scope of dynamic covalent bonds and are very promising in the fields of dynamic materials.

Suggested Citation

  • Wen-Xing Liu & Zhusheng Yang & Zhi Qiao & Long Zhang & Ning Zhao & Sanzhong Luo & Jian Xu, 2019. "Dynamic multiphase semi-crystalline polymers based on thermally reversible pyrazole-urea bonds," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12766-6
    DOI: 10.1038/s41467-019-12766-6
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    Cited by:

    1. Zizheng Fang & Yunpeng Shi & Hongfeng Mu & Runzhi Lu & Jingjun Wu & Tao Xie, 2023. "3D printing of dynamic covalent polymer network with on-demand geometric and mechanical reprogrammability," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    2. Jing Chen & Yiyang Gao & Lei Shi & Wei Yu & Zongjie Sun & Yifan Zhou & Shuang Liu & Heng Mao & Dongyang Zhang & Tongqing Lu & Quan Chen & Demei Yu & Shujiang Ding, 2022. "Phase-locked constructing dynamic supramolecular ionic conductive elastomers with superior toughness, autonomous self-healing and recyclability," Nature Communications, Nature, vol. 13(1), pages 1-12, December.
    3. Yan Mei Li & Ze Ping Zhang & Min Zhi Rong & Ming Qiu Zhang, 2022. "Tailored modular assembly derived self-healing polythioureas with largely tunable properties covering plastics, elastomers and fibers," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    4. Bo Qin & Siyuan Liu & Zehuan Huang & Lingda Zeng & Jiang-Fei Xu & Xi Zhang, 2022. "Closed-loop chemical recycling of cross-linked polymeric materials based on reversible amidation chemistry," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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