Progress of Self‐healing Materials based on Hindered Urea Bonds

Abstract Over the past few decades, polymers with dynamic covalent bonds have received a lot of attention due to their self‐healing, shape memory, and environmental adaptation properties. However, most of them require a change in catalyst or environmental conditions to achieve bond reduction and exchange reactions, and the harsh conditions are not conducive to the practical application of the material. However, the dr‐polyurea based polyurethane (PUU) can be prepared at low temperatures, and can be worn and rebuilt in a catalyst free and mild environment, thus showing excellent self‐healing function. In this paper, the unique dynamic reaction mechanism of hindered urea bond (HUB), the properties of related polymers and the development of frontier are reviewed. In addition, the performance research of HUB and the application prospect of innovative synthetic PUU are also reviewed.