Uchida Junya, Yoshio Masafumi, Kato Takashi
Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo Hongo Bunkyo-ku Tokyo 113-8656 Japan
Chem Sci. 2021 Mar 22;12(17):6091-6098. doi: 10.1039/d0sc06676a.
We here report a new approach to develop self-healing shape memory supramolecular liquid-crystalline (LC) networks through self-assembly of molecular building blocks combination of hydrogen bonding and coordination bonding. We have designed and synthesized supramolecular LC polymers and networks based on the complexation of a forklike mesogenic ligand with Ag ions and carboxylic acids. Unidirectionally aligned fibers and free-standing films forming layered LC nanostructures have been obtained for the supramolecular LC networks. We have found that hybrid supramolecular LC networks formed through metal-ligand interactions and hydrogen bonding exhibit both self-healing properties and shape memory functions, while hydrogen-bonded LC networks only show self-healing properties. The combination of hydrogen bonds and metal-ligand interactions allows the tuning of intermolecular interactions and self-assembled structures, leading to the formation of the dynamic supramolecular LC materials. The new material design presented here has potential for the development of smart LC materials and functional LC membranes with tunable responsiveness.
我们在此报告一种通过分子构建块的自组装、氢键和配位键相结合来开发自愈合形状记忆超分子液晶（LC）网络的新方法。我们基于叉状介晶配体与银离子和羧酸的络合设计并合成了超分子LC聚合物和网络。对于超分子LC网络，已获得形成层状LC纳米结构的单向排列纤维和独立膜。我们发现，通过金属-配体相互作用和氢键形成的混合超分子LC网络兼具自愈合性能和形状记忆功能，而氢键连接的LC网络仅表现出自愈合性能。氢键和金属-配体相互作用的结合使得分子间相互作用和自组装结构得以调节，从而导致动态超分子LC材料的形成。此处提出的新材料设计对于开发具有可调响应性的智能LC材料和功能性LC膜具有潜力。
