Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 42, Issue 20, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.202100391
Keywords
covalent adaptive networks; dynamic; reversible bonds; polyurethanes; reprocessability; self-healability
Categories
Funding
- Natural Science and Engineering Research Council (NSERC) in Canada
- Canada Research Chair (CRC) Award
- Office of the VP Research at Concordia University
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Polyurethane (PU) is widely used in daily life and various applications, and significant efforts have been made to develop self-healable materials with high performance by incorporating covalent dynamic bonds. The review summarizes various strategies for synthesizing self-healable, reprocessable, and recyclable PU materials.
Polyurethane (PU) has not only been widely used in the daily lives, but also extensively explored as an important class of the essential polymers for various applications. In recent years, significant efforts have been made on the development of self-healable PU materials that possess high performance, extended lifetime, great reliability, and recyclability. A promising approach is the incorporation of covalent dynamic bonds into the design of PU covalently crosslinked polymers and thermoplastic elastomers that can dissociate and reform indefinitely in response to external stimuli or autonomously. This review summarizes various strategies to synthesize self-healable, reprocessable, and recyclable PU materials integrated with dynamic (reversible) Diels-Alder cycloadduct, disulfide, diselenide, imine, boronic ester, and hindered urea bond. Furthermore, various approaches utilizing the combination of dynamic covalent chemistries with nanofiller surface chemistries are described for the fabrication of dynamic heterogeneous PU composites.
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