Dynamic urea bond for the design of reversible and self-healing polymers
By Hanze Ying, Yanfeng Zhang, Jianjun Cheng. Nature Communications, 2014
814 citations recorded by the source corpus.
Polymers bearing dynamic covalent bonds may exhibit dynamic properties, such as self-healing, shape memory and environmental adaptation. However, most dynamic covalent chemistries developed so far require either catalyst or change of environmental conditions to facilitate bond reversion and dynamic property change in bulk materials. Here we report the rational design of hindered urea bonds (urea with bulky substituent attached to its nitrogen) and the use of them to make polyureas and poly(urethane-urea)s capable of catalyst-free dynamic property change and autonomous repairing at low temperature. Given the simplicity of the hindered urea bond chemistry (reaction of a bulky amine with an isocyanate), incorporation of the catalyst-free dynamic covalent urea bonds to conventional polyurea or urea-containing polymers that typically have stable bulk properties may further broaden the scope of applications of these widely used materials. The design of dynamic covalent bonds is crucial to self-healing polymer materials, but the reaction normally occurs in the presence of heat or/and catalysts. Ying et al.report a catalyst-free design of dynamic urea bonds that are capable of autonomous repairing at low temperature.
Subfields: Materials Chemistry, Organic Chemistry, Polymers and Plastics
View Paper: https://www.semanticscholar.org/paper/bdf67ec9a7c67e09ebb2505e3b113939c30fa3d3
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Citations in the corpus
- Polymer engineering based on reversible covalent chemistry: A promising innovative pathway towards new materials and new functionalities (2018, background): “Nevertheless, the imilar hindered amide bond remained difficult to be reversible s the transient intermediate ketene resulting from ammonolysis as very active [11,28].”