Hua Ziyu, Chen Guangxue, Zhao Kai, Li Ren'ai, He Minghui
State Key Laboratory of Pulp and Paper Engineering, School of Light Industry and Engineering, South China University of Technology, Guangzhou 510640, China.
Jiangsu Co-innovation Center for Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab Pulp & Paper Science and Technology, Nanjing Forestry University, Nanjing, 210037, China.
ACS Appl Mater Interfaces. 2022 May 18;14(19):22418-22425. doi: 10.1021/acsami.2c00950. Epub 2022 May 9.
Liquid-free ionic conductors (LFICs) have promising applications in flexible electronics because most ionic conductors currently suffer from ionic liquid leakage or water evaporation issues. However, it has been a formidable challenge for LFICs to achieve long-term repeated self-adhesion on different substrates, especially on soft biological tissues. Based on the double-network design concept, we first fabricate a series of repeatable self-adhesive liquid-free double-network ionic conductors (SALFDNICs), consisting of stretchable first poly(AA-ChCl)-type supramolecular deep eutectic polymer networks and stiff second polydopamine (PDA) networks, which can maintain sufficient dynamic hydrogen bonds and catechol groups in the ionic conductors by preventing the overoxidation of dopamine, thus balancing the contradiction between adhesion and cohesion in liquid-free ionic conductors. Therefore, SALFDNICs can instantly form various interface interaction forces with multiple substrates (adhesion strength up to 757 N/m) and firmly adhere to various substrates for 20 detachment-reattachment cycles with a reduction in adhesion strength of less than 15%. Furthermore, SALFDNICs also have other comprehensive properties, such as optimum self-healing properties (self-healing efficiency of 90%), good stretchability (strain at break of 1200%), and promising conductivity (2.31 × 10 S m). Therefore, we believe that the extraordinary performance of SALFDNICs is important for improving device integration and the further development of flexible electronics.
无液离子导体（LFICs）在柔性电子领域具有广阔的应用前景，因为目前大多数离子导体都存在离子液体泄漏或水蒸发问题。然而，对于LFICs来说，在不同基材上实现长期重复自粘，尤其是在柔软的生物组织上，一直是一项艰巨的挑战。基于双网络设计理念，我们首次制备了一系列可重复自粘的无液双网络离子导体（SALFDNICs），它由可拉伸的第一类聚（AA-ChCl）型超分子深共晶聚合物网络和刚性的第二类聚多巴胺（PDA）网络组成，通过防止多巴胺过度氧化，能在离子导体中保持足够的动态氢键和儿茶酚基团，从而平衡无液离子导体中粘附力和内聚力之间的矛盾。因此，SALFDNICs能与多种基材瞬间形成各种界面相互作用力（粘附强度高达757 N/m），并能牢固地粘附在各种基材上，进行20次分离-重新粘附循环，粘附强度降低不到15%。此外，SALFDNICs还具有其他综合性能，如最佳的自愈性能（自愈效率为90%）、良好的拉伸性（断裂应变达1200%）和可观的导电性（2.31×10 S m）。因此，我们认为SALFDNICs的卓越性能对于提高器件集成度和柔性电子的进一步发展具有重要意义。
