Xiang Shuangfei, Zheng Feng, Chen Shuangshuang, Lu Qinghua
School of Chemical Science and Engineering, Tongji University, Shanghai 200092, P. R. China.
ACS Appl Mater Interfaces. 2021 May 5;13(17):20653-20661. doi: 10.1021/acsami.1c02843. Epub 2021 Apr 25.
Flexible electronic materials have aroused significant interest due to the need for flexible electronics in a variety of applications. However, several obstacles such as low mechanical properties, interfacial adhesion problems, and nonreusability hinder their rapid development. Here, an ionogel was developed by a one-step photopolymerization of an ionic liquid (IL) with the C═C bond of 1-vinyl-3-butylimidazolium tetrafluoroborate in another ionic liquid solution of 1-butyl-3-methylimidazolium tetrafluoroborate without a chemical cross-linker. The poly(ionic liquid) and the ionic liquid (PIL/IL) were highly compatible and resulted in an extremely uniform, stable, and optically transparent PIL/IL ionogel. In addition, this method also avoided complicated solvent replacement in the preparation processes of common ionogels. Our experimental and theoretical results showed that the reported ionogel integrated excellent mechanical properties, ultrastrong adhesive, self-healability, and recyclability. These remarkable advantages were benefited from the strong electrostatic force and other noncovalent bond interactions in the ionogel system. The unique ionogel presented in this study is therefore an ideal candidate material for self-adhesive and reusable wearable electronics.
由于各种应用中对柔性电子产品的需求，柔性电子材料引起了广泛关注。然而，诸如机械性能低、界面粘附问题和不可重复使用性等几个障碍阻碍了它们的快速发展。在此，通过在1-丁基-3-甲基咪唑四氟硼酸盐的另一种离子液体溶液中，使离子液体（IL）与1-乙烯基-3-丁基咪唑四氟硼酸盐的C═C键进行一步光聚合，在没有化学交联剂的情况下制备了一种离子凝胶。聚（离子液体）和离子液体（PIL/IL）具有高度相容性，形成了极其均匀、稳定且光学透明的PIL/IL离子凝胶。此外，该方法还避免了普通离子凝胶制备过程中复杂的溶剂置换。我们的实验和理论结果表明，所报道的离子凝胶兼具优异的机械性能、超强粘附性、自愈合性和可回收性。这些显著优点得益于离子凝胶体系中的强静电力和其他非共价键相互作用。因此，本研究中提出的独特离子凝胶是自粘且可重复使用的可穿戴电子产品的理想候选材料。
