Chen Lie, Zhao Cong, Huang Jin, Zhou Jiajia, Liu Mingjie
Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100191, China.
Nerve-Machine Integration and Cognitive Competition Center, Beijing Machine and Equipment institute, Beijing, 100854, China.
Nat Commun. 2022 Nov 10;13(1):6821. doi: 10.1038/s41467-022-34677-9.
The rapid development of flexible electronics and soft robotics has an urgent demand for materials with wide-range switchable stiffness. Here, we report a polymer network that can isochorically and reversibly switch between soft ionogel and rigid plastic accompanied by a gigantic stiffness change from about 600 Pa to 85 MPa. This transition is realized by introducing polymer vitrification to regulate the liquid-liquid phase separation, namely the Berghmans' point in the phase diagram of binary gel systems. Regulating the Lewis acid-base interactions between polymer and ionic liquids, the stiffness-changing ratio of polymer network can be tuned from 10 to more than 10. These wide-range stiffness-changing ionogels show excellent shape adaptability and reconfigurability, which can enhance the interfacial adhesion between ionogel and electrode by an order of magnitude and reduce interfacial impedance by 75%.
柔性电子学和软体机器人技术的快速发展对具有宽范围可切换刚度的材料有迫切需求。在此，我们报道了一种聚合物网络，它可以在软离子凝胶和刚性塑料之间进行等容且可逆的切换，同时伴随着从约600帕到85兆帕的巨大刚度变化。这种转变是通过引入聚合物玻璃化来调节液 - 液相分离实现的，即在二元凝胶体系相图中的伯格曼点。通过调节聚合物与离子液体之间的路易斯酸碱相互作用，聚合物网络的刚度变化率可以从10调整到10以上。这些具有宽范围刚度变化的离子凝胶表现出优异的形状适应性和可重构性，可将离子凝胶与电极之间的界面粘附力提高一个数量级，并将界面阻抗降低75%。
