文献类型：期刊文献

英文题名：An Ultrastrong and Highly Stretchable Polyurethane Elastomer Enabled by a Zipper-Like Ring-Sliding Effect

作者：Shi, Chen-Yu[1,2];Zhang, Qi[1,2];Yu, Cheng-Yuan[1,2];Rao, Si-Jia[1,2];Yang, Shun[1,2];Tian, He[1,2];Qu, Da-Hui[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn,Key Lab Adv Mat, Feringa Nobel Prize Scientist Joint Res Ctr, Frontiers Sci Ctr Materiobiol & Dynam Chem,Inst F, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn,Joint Int Res Lab Precis Chem, Feringa Nobel Prize Scientist Joint Res Ctr, Frontiers Sci Ctr Materiobiol & Dynam Chem,Inst F, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2020

卷号：32

期号：23

外文期刊名：ADVANCED MATERIALS

收录：;EI(收录号：20201808602034);WOS:【SCI-EXPANDED(收录号:WOS:000529659000001)】；

基金：This work was supported by National Natural Science Foundation of China (Grants 21790361, 21871084, 21672060), Shanghai Municipal Science and Technology Major Project (Grant No. 2018SHZDZX03), the Fundamental Research Funds for the Central Universities, the Programme of Introducing Talents of Discipline to Universities (Grant B16017), Program of Shanghai Academic/Technology Research Leader (19XD1421100), and the Shanghai Science and Technology Committee (grant 17520750100). The authors thank the Test of East China University of Science and Technology for help on the material characterization.

语种：英文

外文关键词：dry networks; elastomers; ring-sliding effects; supramolecular polymers

摘要：Elastomers with excellent mechanical properties are in substantial demand for various applications, but there is always a tradeoff between their mechanical strength and stretchability. For example, partially replacing strong covalent crosslinking by weak sacrificial bonds can enhance the stretchability but also usually decreases the mechanical strength. To surmount this inherent tradeoff, a supramolecular strategy of introducing a zipper-like sliding-ring mechanism in a hydrogen-bond-crosslinked polyurethane network is proposed. A very small amount (0.5 mol%) of an external additive (pseudo[2]rotaxane crosslinker) can dramatically increase both the mechanical strength and elongation of this polyurethane network by nearly one order of magnitude. Based on the investigation of the relationship between molecular structure and mechanical properties, this enhancement is attributable to a unique molecular-level zipper-like ring-sliding motion, which efficiently dissipates mechanical work in the solvent-free network. This research not only provides a distinct and general strategy for the construction of high-performance elastomers but also paves the way for the practical application of artificial molecular machines toward solvent-free polyurethane networks.