文献类型：期刊文献

英文题名：Photoinduced Contraction Fibers and Photoswitchable Adhesives Generated by Stretchable Supramolecular Gel

作者：Li, Jinjie[1];Wang, He[1];Liu, Binxiu[1];Chen, Jianzhuang[1];Gu, Jinlou[1];Lin, Shaoliang[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Shanghai Key Lab Adv Polymer Mat,Key Lab Ultrafin, Shanghai 200237, Peoples R China

年份：2022

卷号：32

期号：30

外文期刊名：ADVANCED FUNCTIONAL MATERIALS

收录：;EI(收录号：20221912070255);WOS:【SCI-EXPANDED(收录号:WOS:000790435700001)】；

基金：J.L. and H.W. contributed equally to this work. This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 52073092 and 51873061). Support from the Projects of Shanghai Municipality (21ZR1415900 and 19JC1411700) is also appreciated.

语种：英文

外文关键词：extreme stretchability; photoinduced contractions; photoswitchable adhesives; smart fibers; strain-induced crystallization

摘要：Dynamically crosslinked supramolecular networks have emerged in the last decades as extremely stretchable and self-healing materials thanks to the energy dissipation in weak and reversible interactions. Stretchable materials with tunable properties represent an effort to develop a charming class of smart devices. Once stretched, however, these materials' properties are usually fixed due to strain-induced crystallization (SIC), hindering their practical applications. Here, photoinduced contraction smart fibers and photoswitchable adhesives are generated from a dynamic supramolecular gel network, the SIC in which can be disrupted by UV irradiation to release the prestored strain energy. The dynamic sliding of azo-bridged bipedal host molecules along the polymer chains renders the extreme stretchability of supramolecular gel under stretching forces. The oriented crystalline microdomains or crystallites through SIC upon stretching serve as physical crosslinks to store the contractile energy of fibers and improve the adhesion force of adhesives, and then are disoriented induced by trans-to-cis isomerization of azobenzene mesogens to release the prestored strain energy, resulting in such contraction of fibers and reduction of adhesion strength of adhesives. This work provides inspiration for exploring the structure-property relationship of supramolecular networks and transforming their clear potential to fabricate more remarkable synthetic smart materials.