High strength and self-healable gelatin/polyacrylamide double network hydrogels
at λ = 30), and rapid self-recovery properties (∼87% toughness recovery at room temperature). These superior properties were largely attributed to effective energy dissipation via the rupture of the first gelatin network. Most interestingly, Gelatin/PAAm DN gels without any chemical crosslinkers in the second network enabled the achievement of both high mechanical strength and fast self-healing properties. By modulating the heating temperatures and healing times, the healed Gelatin/PAAm gels could achieve 53% healing efficiency at a physiological temperature range, which greatly expands their uses for biomedical applications. The combination of high strength, self-recovery, and self-healing properties makes Gelatin/PAAm gels promising candidates for further development and use as thermoresponsive biomaterials under physiological conditions.