Strong Autonomic Self-Healing Biobased Polyamide Elastomers

• Published in: Chemistry of materials Vol. 32; no. 19; pp. 8325 - 8332
• Main Authors: Wu, Mang, Yuan, Liang, Jiang, Feng, Zhang, Yaqiong, He, Yueran, You, Ye-Zi, Tang, Chuanbing, Wang, Zhongkai
• Format: Journal Article
• Language: English
• Published: American Chemical Society 13.10.2020
• ISSN: 0897-4756; 1520-5002
• DOI: 10.1021/acs.chemmater.0c02169

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.