Tamate Ryota, Hashimoto Kei, Horii Tatsuhiro, Hirasawa Manabu, Li Xiang, Shibayama Mitsuhiro, Watanabe Masayoshi
Department of Chemistry and Biotechnology, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, 240-8501, Japan.
Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwano-ha, Kashiwa, Chiba, 277-8581, Japan.
Adv Mater. 2018 Jul 31:e1802792. doi: 10.1002/adma.201802792.
Ion gels, composed of macromolecular networks filled by ionic liquids (ILs), are promising candidate soft solid electrolytes for use in wearable/flexible electronic devices. In this context, the introduction of a self-healing function would significantly improve the long-term durability of ion gels subject to mechanical loading. Nevertheless, compared to hydrogels and organogels, the self-healing of ion gels has barely investigated been because of there being insufficient understanding of the interactions between polymers and ILs. Herein, a new class of supramolecular micellar ion gel composed of a diblock copolymer and a hydrophobic IL, which exhibits self-healing at room temperature, is presented. The diblock copolymer has an IL-phobic block and a hydrogen-bonding block with hydrogen-bond-accepting and donating units. By combining the IL and the diblock copolymer, micellar ion gels are prepared in which the IL phobic blocks form a jammed micelle core, whereas coronal chains interact with each other via multiple hydrogen bonds. These hydrogen bonds between the coronal chains in the IL endow the ion gel with a high level of mechanical strength as well as rapid self-healing at room temperature without the need for any external stimuli such as light or elevated temperatures.
离子凝胶由填充离子液体（ILs）的大分子网络组成，是用于可穿戴/柔性电子设备的有前途的候选软固体电解质。在这种情况下，引入自修复功能将显著提高离子凝胶在机械负载下的长期耐久性。然而，与水凝胶和有机凝胶相比，由于对聚合物与离子液体之间的相互作用了解不足，离子凝胶的自修复几乎没有得到研究。在此，提出了一种由双嵌段共聚物和疏水性离子液体组成的新型超分子胶束离子凝胶，其在室温下表现出自修复性能。双嵌段共聚物具有一个疏离子液体嵌段和一个带有氢键接受和供体单元的氢键嵌段。通过将离子液体和双嵌段共聚物结合，制备出胶束离子凝胶，其中疏离子液体嵌段形成一个紧密堆积的胶束核心，而冠状链通过多个氢键相互作用。离子液体中冠状链之间的这些氢键赋予离子凝胶高水平的机械强度以及在室温下无需任何外部刺激（如光或升高温度）即可快速自修复的能力。
