State Key Lab of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610065, China.
Macromol Rapid Commun. 2018 Mar;39(6):e1700678. doi: 10.1002/marc.201700678. Epub 2018 Jan 4.
A metal-ligand crosslinked internal self-healing polyurethane is developed using low-cost and commercially available compounds. The mechanical, photoluminescent, and self-healing properties can be governed by incorporating multiple metal-ligand crosslinks with weak and strong coordination bonds and varying the metal ion. In-situ attenuated total reflectance Fourier transform infrared spectroscopy reveals that the metal-ligand bond is cleaved during the damage process while metal ion is still coordinated with the ligand by stronger metal-pyridyl interaction. The multiple metal-ligand coordination facilitates the crosslinks to be fully reformed during the repairing process, leading to the superior self-healing property.
一种金属-配体交联的内部分子自修复聚氨酯是利用低成本和商业上可获得的化合物开发的。通过引入具有弱配位键和强配位键的多种金属-配体交联，并改变金属离子，可以控制其力学性能、光致发光性能和自修复性能。原位衰减全反射傅里叶变换红外光谱表明，在损伤过程中金属-配体键断裂，而金属离子仍通过更强的金属-吡啶相互作用与配体配位。多种金属-配体配位有利于交联在修复过程中完全重新形成，从而表现出优异的自修复性能。
