Kamio Eiji, Minakata Masayuki, Nakamura Hinako, Matsuoka Atsushi, Matsuyama Hideto
Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan.
Research Center for Membrane and Film Technology, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan.
Soft Matter. 2022 Jun 29;18(25):4725-4736. doi: 10.1039/d2sm00410k.
Constructing crosslinked polymer networks reversible interactions is a promising approach to recover the mechanical strength of damaged gels. In addition, by designing effective reversible crosslinks, the mechanical strength of the gel can be enhanced through energy dissipation based on the destruction of the crosslinks by an applied force. In this study, we introduced zeolitic imidazole framework-8 nanoparticles (ZIF-8 NPs), which acted as multifunctional crosslinkers, to provide multipoint coordination bonding with a poly(,-dimethylacrylamide)-based polymer network in a gel containing an ionic liquid. The mechanical strength of the gel increased with an increase in the content of ZIF-8 NPs up to 6 wt%. It was confirmed that the energy loaded onto the gel was dissipated through the desorption of the polymer network from the surface of the ZIF-8 NPs. Owing to the reversible destruction and reconstruction of the coordinative crosslinking between the polymer network and ZIF-8 NPs, the mechanical strength of the damaged gel was almost fully recovered through annealing.
构建具有可逆相互作用的交联聚合物网络是恢复受损凝胶机械强度的一种很有前景的方法。此外，通过设计有效的可逆交联，凝胶的机械强度可以通过基于外力破坏交联而产生的能量耗散来提高。在本研究中，我们引入了作为多功能交联剂的沸石咪唑框架-8纳米颗粒（ZIF-8 NPs），以在含有离子液体的凝胶中与基于聚（N，N-二甲基丙烯酰胺）的聚合物网络提供多点配位键合。凝胶的机械强度随着ZIF-8 NPs含量增加至6 wt%而增加。证实加载到凝胶上的能量通过聚合物网络从ZIF-8 NPs表面的解吸而耗散。由于聚合物网络与ZIF-8 NPs之间配位交联的可逆破坏和重建，受损凝胶的机械强度通过退火几乎完全恢复。
