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- W2980470369 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." @default.
- W2980470369 created "2019-10-25" @default.
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- W2980470369 date "2019-10-18" @default.
- W2980470369 modified "2023-10-17" @default.
- W2980470369 title "Dynamic multiphase semi-crystalline polymers based on thermally reversible pyrazole-urea bonds" @default.
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- W2980470369 doi "https://doi.org/10.1038/s41467-019-12766-6" @default.
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