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

Wen-Xing Liu, Zhusheng Yang, Zhi Qiao, Long Zhang (), Ning Zhao (), Sanzhong Luo and Jian Xu ()
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Wen-Xing Liu: Chinese Academy of Sciences
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

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-12766-6

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