Research Institute of Materials Science, South China University of Technology, Guangzhou, 510640, China.
Research Institute of Materials Science, South China University of Technology, Guangzhou, 510640, China.
Carbohydr Polym. 2018 Aug 1;193:54-61. doi: 10.1016/j.carbpol.2018.03.039. Epub 2018 Mar 15.
A new supramolecular hydrogel with superior self-healing and shape memory properties was synthesized via in-situ copolymerization of the adamantane-containing monomer N-adamantylacrylamide (Ad-AAm) and monomer acrylic acid (AAc) in the polycyclodextrin (PCD) aqueous solution, where PCD served as the polyfunctional physical cross-linker. The PCD-Ad hydrogels showed strength of 40 kPa with breaking strain of 600%, but small tensile loading-unloading hysteresis and residual deformation benefited from the reversible crosslinking structure. Excellent self-healing property was realized at 70 °C and humid condition. The healing percentage reached over 70% after 120 min, which showed enhanced self-healing efficiency compared with the reported supramolecular hydrogels crosslinked by CD and Ad. This may benefit from the polyfunctional PCD crosslinking reagent, which provided more host sites and binding opportunities for the complexation during the self-healing process. Shape memory behavior was also realized through the reversible second crosslinked network by the carboxyl groups of PAAc with Fe ions. The present study provides a new method to improve self-healing ability of the supramolecular hydrogels, which will find the applications in self-healing coating, biomedical materials and soft actuators.
一种具有优异自修复和形状记忆性能的新型超分子水凝胶是通过在聚环糊精（PCD）水溶液中原位共聚含金刚烷单体 N-金刚烷基丙烯酰胺（Ad-AAm）和单体丙烯酸（AAc）合成的，其中 PCD 用作多功能物理交联剂。PCD-Ad 水凝胶的强度为 40kPa，断裂伸长率为 600%，但较小的拉伸加载-卸载滞后和残余变形得益于可逆交联结构。在 70°C 和潮湿条件下实现了优异的自修复性能。在 120 分钟后，自修复百分比超过 70%，与报道的由 CD 和 Ad 交联的超分子水凝胶相比，显示出增强的自修复效率。这可能得益于多功能 PCD 交联试剂，它在自修复过程中为络合提供了更多的主体位置和结合机会。通过 PAAc 的羧基与 Fe 离子的可逆二次交联网络也实现了形状记忆行为。本研究为提高超分子水凝胶的自修复能力提供了一种新方法，将在自修复涂层、生物医学材料和软致动器中找到应用。
