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

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ID: 64005
2019
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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.
Reference Key
liu2019dynamicnature Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Liu, Wen-Xing;Yang, Zhusheng;Qiao, Zhi;Zhang, Long;Zhao, Ning;Luo, Sanzhong;Xu, Jian;
Journal Nature communications
Year 2019
DOI
10.1038/s41467-019-12766-6
URL
Keywords
crystal structure pyrazole 3,5-di-tert-butyl-4-hy­droxy­phen­yl n—h⋯o hydrogen bonds carboxamide inversion dimer

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