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