Damage-resistant and healable polyacrylonitrile-derived stretchable materials with exceptional fracture toughness and fatigue threshold
JOURNAL OF MATERIALS CHEMISTRY A(2021)
摘要
Stretchable materials are widely used in various aspects of our daily lives, however, achieving excellent short and long-term damage tolerance in them, i.e., high fracture toughness and fatigue threshold at the same time, remains a challenge. Herein, we report a healable and stretchable material with exceptional damage tolerance based on Al3+ coordinated partiallyamidoximated polyacrylonitrile (Al3+-APAN). Due to the presence of strong coordination bonds and polymer crystalline aggregates, the obtained material exhibits a high fracture toughness of 102.29 +/- 5.94 kJ m(-2) and a high fatigue threshold of 1.73 +/- 0.045 kJ m(-2), exceeding those of many natural and synthetic materials. Besides, Al3+-APAN possesses a good tensile strength of up to similar to 14 MPa, a high elastic modulus of up to similar to 47 MPa, and can be conveniently healed if damaged, thus greatly extending its service time. We believe that this work provides a straightforward strategy to develop tough, healable and stretchable materials with exceptional damage-tolerance for advanced applications such as in protective coatings, wearable electronic devices and soft robotics.
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