Self-healing and human-friendly electronics, with plenty of dynamic structural motifs, are desired to be ultrastretchable, highly sensitive, self-powered and responsive with external stimulus as the medium of artificial intelligence. Herein, meticulously engineered dynamic structural motifs, slipping semi-crystalline dynamic hydrogen bonding arrays (SSHAs) were firstly proposed and utilized to achieve ultrastretchable (2880 %), tough (115.7 MJ∙m −3 ) elastomers (PAT) with excellent actuation performance (actuation strain ≈ 37 %) and human-friendly healing temperature. For the multifunctionality, the elaborate assembly of SSHAs was also adopted to obtain three-dimensional (3D) physical networks (PAT-M) by integrating with Ti 3 C 2 T x and silver nanowire . As expected, high sensitivity (gauge factor, GF ≈ 60.6) and ultrahigh energy harvesting property (2.6 W∙m −2 ) were simultaneously achieved attributing to the 3D physical networks. This study not only provides a brand-new and promising strategy to develop human-friendly self-healing elastomers, but also promotes the advances of multifunctional electronics.
Tu Jing,Xu Heng,Tian Jingqing,Li Haozhe,Liang Li,Li Pingyun,Guo Xiaode
Internal damage of propellant, especially interfacial debonding, can easily cause major accident and consume a lot of costs. Although some literatures describe the application of self-healing adhesives in the field of propellant, the mechanical properties are usually poor, and the application of self-healing adhesives on debonded interfaces has never been studied. In this work, a high-strength polyurethane adhesive with tensile strength greater than 10 MPa and rapid self-healing ability (recovery at room temperature for 24 h) was constructed based on multiple weak hydrogen bond arrays and highly active disulfide bonds. Importantly, we ground breakingly tested the self-healing effect for interfacial debonding. Benefiting from the high-strength adhesion of a large number of hydrogen bond arrays, the peel strength of the adhesive at the propellant interface is 140% higher than that of traditional adhesives. At the same time, it can effectively heal the debonded interface, and the peel strength is still higher than that of traditional adhesives even undergo secondary healing. Our work has implications for solving the industry's thorny - propellant interface debonding.
Juan Tian,Zhenwei Zhou,Xiangyu Miao,Shoubin Wang,Yongqiang Ming,Yijing Nie,Yuanchi Ma,Zhibo Li
The structure and density of hydrogen bonds in thermoplastic poly(urethane urea) (TPU) elastomers play a pivotal role in determining their microscopic structures and macroscopic thermomechanical performances. In this context, the syntheses and characterizations of a class of poly(caprolactone) (PCL)-based TPU elastomers containing acylsemicarbazide (ASCZ) groups that afford densely packed hydrogen-bonding arrays are reported. Benefiting from the strong intermolecular interactions, these TPU elastomers display ultimate engineering stress and elongation up to 70 MPa and 1100%, respectively, and therefore considerable toughness of 260 MJ m −3 . Meanwhile, crystallization of PCL segments in the elastomers is strongly suppressed by the hydrogen-bonding arrays, giving rise to their good elasticity at strains as high as 1000%, superior to nearly all polyester-based TPU analogs. With identical hard segment content, fine-tuning of the hydrogen-bonding density via the chain extender chemistry leads to divergent upper working temperatures and healing rates, despite uniformly superb ultimate strength, elongation at break, toughness, and resilience at room temperature.
危险品化学品经营许可证（带存储）