We for the first time used hindered urea bond (HUB) as a type of novel dynamic covalent chemistry to create dynamic materials. Due to the disturbance of amide bond planarity by bulky substituents, the usually stable urea bond is destabilized in HUB, which could reversibly dissociate into isocyanate and amine. Polymers bearing HUB were synthesized, and chain rearrangement was observed at low temperature without any external stimuli. Cross-linked polymers based on HUB were also designed and constructed. Due to the dynamic property of HUB, the cross-linked materials show intrinsic self-healing properties. It is one of the very few examples of efficient self-healing materials under mild condition without any external stimuli, which can be synthesized with inexpensive industrial raw materials.

Design of dynamic and self-healing polymers based on hindered urea bond (HUB)

248th National Meeting (2014)

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