Preparation of high self-healing efficiency crosslink HTPB adhesive for improving debonding of propellant interface
The problem of debonding of interface between propellant grain and propellant coating has been a tricky problem that puzzled many scholars. Self-healing adhesives were expected to solve this problem. In this article, we studied the most widely used HTPB system in composite propellants. By adopting free radical polymerization HTPB as the soft segment of the adhesive and introducing aromatic disulfides, we successfully prepared self-healing polyurethane adhesives. The adhesive can self-heal at a safe temperature of 80 ℃, with a breaking elongation of more than 700% , a self-healing efficiency of up to 97%, and excellent thermal stability. The interface self-healing experiment showed that the adhesive can recover the debonding damage at the interface. Our results would provide a new insight to rebonding of interface between propellant grain and coating.