Yasui Tomoki, Kamio Eiji, Matsuyama Hideto
Research Center for Membrane and Film Technology, Department of Chemical Science and Engineering, Kobe University 1-1 Rokkodai-cho, Nada-ku Kobe Hyogo 657-8501 Japan
RSC Adv. 2020 Apr 9;10(24):14451-14457. doi: 10.1039/d0ra02478c. eCollection 2020 Apr 6.
We have previously reported tough inorganic/organic nanocomposite (NC) ion gels composed of silica particles and poly(,-dimethylacrylamide) (PDMAAm) networks and a large amount of ionic liquid. In this study, the network structure and toughening mechanism of NC ion gels were investigated. The NC ion gels showed characteristic mechanical properties; the stress was significantly increased at a highly elongated state. In addition, the NC ion gels showed an almost elastic mechanical property, which was completely different from that of our other developed inorganic/organic tough ion gels named double-network (DN) ion gels. It was found from structural observation that secondary silica nanoparticles dispersed well in the NC ion gel. It was also found that some of the secondary silica nanoparticles had a ring-like structure which would incorporate PDMAAm chains. From the silica particle content dependency on stress-strain curves of inorganic/organic NC ion gels, it was inferred that the secondary silica particles could serve as a movable cross-linker of PDMAAm chains in the NC ion gel.
我们之前报道过由二氧化硅颗粒、聚（N，N-二甲基丙烯酰胺）（PDMAAm）网络和大量离子液体组成的坚韧无机/有机纳米复合（NC）离子凝胶。在本研究中，对NC离子凝胶的网络结构和增韧机理进行了研究。NC离子凝胶表现出独特的力学性能；在高度拉伸状态下应力显著增加。此外，NC离子凝胶表现出几乎弹性的力学性能，这与我们开发的其他无机/有机坚韧离子凝胶——双网络（DN）离子凝胶完全不同。通过结构观察发现，二次二氧化硅纳米颗粒在NC离子凝胶中分散良好。还发现一些二次二氧化硅纳米颗粒具有环状结构，该结构会包含PDMAAm链。从无机/有机NC离子凝胶的应力-应变曲线对二氧化硅颗粒含量的依赖性推断，二次二氧化硅颗粒可作为NC离子凝胶中PDMAAm链的可移动交联剂。
