Zhang Jun, Wang Wenxiang, Zhang Yan, Wei Qiang, Han Fei, Dong Shengyi, Liu Dongqing, Zhang Shiguo
College of Materials Science and Engineering, Hunan University, Changsha, 410082, China.
College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China.
Nat Commun. 2022 Sep 5;13(1):5214. doi: 10.1038/s41467-022-32997-4.
Low-molecular-weight adhesives (LMWAs) possess many unique features compared to polymer adhesives. However, fabricating LMWAs with adhesion strengths higher than those of polymeric materials is a significant challenge, mainly because of the relatively weak and unbalanced cohesion and interfacial adhesion. Herein, an ionic liquid (IL)-based adhesive with high adhesion strength is demonstrated by introducing an IL moiety into a Y-shaped molecule replete with hydrogen bonding (H-bonding) interactions. The IL moieties not only destroyed the rigid and ordered H-bonding networks, releasing more free groups to form hydrogen bonds (H-bonds) at the substrate/adhesive interface, but also provided electrostatic interactions that improved the cohesion energy. The synthesized IL-based adhesive, Tri-HT, could directly form thin coatings on various substrates, with high adhesion strengths of up to 12.20 MPa. Advanced adhesives with electrical conductivity, self-healing behavior, and electrically-controlled adhesion could also be fabricated by combining Tri-HT with carbon nanotubes.
与聚合物粘合剂相比，低分子量粘合剂（LMWAs）具有许多独特的特性。然而，制备具有高于聚合物材料粘附强度的LMWAs是一项重大挑战，主要是因为内聚力和界面粘附力相对较弱且不平衡。在此，通过将离子液体（IL）部分引入充满氢键（H键）相互作用的Y形分子中，展示了一种具有高粘附强度的基于离子液体的粘合剂。IL部分不仅破坏了刚性且有序的H键网络，释放出更多自由基团以在基材/粘合剂界面形成氢键（H键），还提供了改善内聚能的静电相互作用。合成的基于IL的粘合剂Tri-HT可以直接在各种基材上形成薄涂层，具有高达12.20 MPa的高粘附强度。通过将Tri-HT与碳纳米管结合，还可以制备具有导电性、自修复行为和电控粘附性的先进粘合剂。
