文献类型：期刊文献

英文题名：Fast room-temperature self-healing vitrimers enabled by accelerated associative exchange kinetics

作者：Liu, Jie[1];Li, Jin-Jin[2];Luo, Zheng-Hong[1];Zhou, Yin-Ning[1]

机构：[1]Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Dept Chem Engn, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：452

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20224112854269);WOS:【SCI-EXPANDED(收录号:WOS:000869665900001)】；

基金：The authors acknowledge the supports from National Natural Sci- ence Foundation of China (Nos. 22078195, 22222807, and 21808140) , Shanghai Pujiang Program (No. 2020PJD023) , Shanghai Rising -Star Program (No. 22QA1402800) , and Natural Science Foundation of Shanghai (No. 20ZR1429800) . The authors also thank Dr. Lin Cheng from Advanced Rheology Institute of Shanghai Jiao Tong University for rheology measurement assistance and Shuzhen Yan for the valuable helps of LSCM tests.

语种：英文

外文关键词：Associative exchange kinetics; Self -healing; Vitrimers; Cyclic structure topology; Dobrynin model

摘要：Enhanced dynamicity remains a matter of concern in vitrimer design for fast self-healing materials. In this study, we fabricated pseudo-cyclic vinylogous urethane (VU) vitrimers with accelerated associative exchange kinetics and enhanced mechanical properties based on a bottom-up strategy. Unique cation-templated pseudo-crown ether building blocks were prepared via coordination of alkali metal ions. The resultant pseudo-cyclic VU vit-rimers possess higher crosslinking densities and more orderly arranged network topologies than their counterpart vitrimer based on linear building blocks, which were confirmed by swelling experiments and free volume pa-rameters determination. Tensile strength and toughness were significantly improved, which are positively correlated with complexation strength. Furthermore, both stress relaxation and creep recovery experiments demonstrate that pseudo-cyclic vitrimers can undergo more rapidly topological rearrangement due to the syn-ergetic effect of unique pseudo-cyclic structure and alkaline metal salts-promoted catalytic dynamic exchange. Given that the resultant vitrimers exhibit a high-efficient self-healable capability at room temperature. This work contributes to tailor-make fast room-temperature self-healing vitrimers via a building block design and expands the potential of vitrimers.