Effect of Coordination Sacrificial Bond Strength on Toughening Properties of Polyesters
Jie Chen1, Sheng Wang1, Jie Huan1, Zhikai Li2, Xiaoming Yang1, Xiaohong Li1*（李晓虹）, Yingfeng Tu1*（屠迎锋）
1Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry,Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
2College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, China
Macromolecules,2024, 57, 9, 4054-4061
Abstract: By the coordination of dangling terpyridine (TPY) ligands with transition metal ions to form supramolecular cross-linking points as sacrificial bonds (SBs), a double-cross-linked system is constructed from the physically cross-linked semicrystalline polyesters. The mechanical properties are greatly enhanced, and the effect of coordination interaction strength on the toughening effect has been investigated by using different ions (Fe2+, Co2+, Ni2+, Cu2+, and Zn2+). It shows that stronger coordination bonds provide a larger Young’s modulus, but not for strength and toughness, which increase first and then decrease after achieving a maximum value at an optimal SB strength. This is due to the properties estimated at different strains, where the supramolecular and physically cross-linking points behave differently. Our results demonstrate that SB strength is not the higher, the better, which should be useful for the design of strong and tough materials.
链接：//pubs.acs.org/doi/10.1021/acs.macromol.3c02452
