Strong Autonomic Self-Healing Biobased Polyamide Elastomers

Autonomic self-healing materials can self-heal without external stimuli and exterior agents. However, most of these materials have inferior mechanical strength. We reported a class of biobased polyamide elastomers as strong autonomic self-healing materials. A high density of hydrogen bonds, chain entanglements, and rigid crystalline domains provide these elastomers with high tensile strength (21.4 MPa) and high toughness (37.5 MJ/m3). The coexistence of a dynamic H-bonding network and olefin cross-metathesis in the amorphous matrix dictates the outstanding autonomic self-healing behavior with ∼100% scratch recovery. The self-healed elastomers show a recovery of ultimate tensile strength, elongation at break, and tensile toughness at 87.8%, 109%, and 86.4%, respectively.