A review on room-temperature self-healing polyurethane:synthesis,self-healing mechanism and application

Polyurethanes have been widely used in many fields due to their remarkable features such as excellent mechanical strength,good abrasion resistance,toughness,low temperature flexibility,etc.In recent years,room-temperature self-healing polyurethanes have been attracting broad and growing interest because under mild conditions,roomtemperature self-healing polyurethanes can repair damages,thereby extending their lifetimes and reducing maintenance costs.In this paper,the recent advances of room-temperature self-healing polyurethanes based on dynamic covalent bonds,noncovalent bonds and combined dual or triple dynamic bonds are reviewed,focusing on their synthesis methods and self-healing mechanisms,and their mechanical properties,healing efficiency and healing time are also described in detial.In addition,the latest applications of room-temperature self-healing polyurethanes in the fields of leather coatings,photoluminescence materials,flexible electronics and biomaterials are summarized.Finally,the current challenges and future development directions of the room-temprature self-healing po lyurethanes are highlighted.Overall,this review is expecte d to provide a valuab le reference for the prosperous development of roomtemperature self-healing polyurethanes.