Key Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information Technology, Department of Applied Chemistry Northwestern Polytechnical University, Xi'an, 710072, China.
College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science and Technology, Xi'an, 710021, China.
Macromol Rapid Commun. 2022 Jan;43(1):e2100510. doi: 10.1002/marc.202100510. Epub 2021 Nov 10.
To solve the issue of polymeric materials recycling, developing intrinsic self-healing materials containing dynamic bonds has attracted many researchers' highly concerning. However, the tradeoff between their mechanical strength and stretchability always does not avoid. Herein, to surmount the above tradeoff, metal-ligand (Cu -S) interactions are introduced into the cross-linking polythiourethane covalent adaptable networks (PTU CANs) with three kinds of dynamic motifs (thiourethane, disulfide, and hydrogen bonds). When the molar ratio of Cu to S is 6.37%, the break strength (9.41 ± 0.34 MPa) and Young's modulus (26.02 ± 0.55 MPa) of the metal-ligand coordination complex PTU (Cu -PTU-3) dramatically increase, whereas the peak strain almost does not decline (454.44 ± 3.95%). To conduct the repairing, Cu -PTU-3 is further confirmed excellent repairing capability. Therefore, these new PTU CANs have significant potential for the new self-healing materials.
为了解决聚合材料回收问题，开发含有动态键的内在自修复材料引起了许多研究人员的高度关注。然而，其机械强度和拉伸性之间的权衡总是不可避免的。在此，为了克服上述权衡，金属配体（Cu-S）相互作用被引入到具有三种动态结构单元（硫脲键、二硫键和氢键）的交联聚硫代氨基甲酸酯共价自适应网络（PTU CANs）中。当 Cu 与 S 的摩尔比为 6.37%时，金属配体配位络合物 PTU（Cu-PTU-3）的断裂强度（9.41±0.34 MPa）和杨氏模量（26.02±0.55 MPa）显著提高，而峰值应变几乎没有下降（454.44±3.95%）。为了进行修复，Cu-PTU-3 被进一步证实具有优异的修复能力。因此，这些新型 PTU CANs 在新型自修复材料方面具有重要的应用潜力。
