Inorganic/Organic Double-Network Gels Containing Ionic Liquids
Inorganic/Organic Double-Network Gels Containing Ionic Liquids
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DOI：
10.1002/adma.201704118
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发表时间：
2017-12-20
影响因子：
29.4
通讯作者：
Matsuyama, Hideto
中科院分区：
文献类型：
--
作者：
Kamio, Eiji;Yasui, Tomoki;Matsuyama, Hideto
制备了一种高度坚固的离子凝胶，称为双网络（DN）离子凝胶，它由无机/有机互穿网络和大量离子液体（ILs）组成。离子液体含量为80 wt%的DN离子凝胶展现出极高的机械强度：压缩断裂应力超过28 MPa。在DN离子凝胶的制备过程中，在离子液体中形成了由物理键合的二氧化硅纳米粒子构成的脆性无机网络和由聚二甲基丙烯酰胺（PDMAAm）构成的韧性有机网络。由于无机/有机网络的反应机制不同，DN离子凝胶可以通过一种简便且可自由成型的一锅法合成来制备。它们不仅可以通过多步工艺，还可以通过单步工艺，通过控制无机和有机网络的形成顺序以可控的方式制备。当二氧化硅粒子在PDMAAm网络形成之前形成网络时，就可以制备出DN离子凝胶。DN离子凝胶中脆性的二氧化硅粒子网络作为牺牲键，在受力时容易断裂以耗散能量，而韧性的PDMAAm网络则通过橡胶弹性保持材料的形状。鉴于二氧化硅粒子之间可逆的物理键合，DN离子凝胶通过退火表现出显著的自恢复程度。
Highly robust ion gels, termed double-network (DN) ion gels, composed of inorganic/organic interpenetrating networks and a large amount of ionic liquids (ILs), are fabricated. The DN ion gels with an 80 wt% IL content show extraordinarily high mechanical strength: more than 28 MPa of compressive fracture stress. In the DN ion gel preparation, a brittle inorganic network of physically bonded silica nanoparticles and a ductile organic network of polydimethylacrylamide (PDMAAm) are formed in the IL. Because of the different reaction mechanisms of the inorganic/organic networks, the DN ion gels can be formed by an easy and free-shapeable one-pot synthesis. They can be prepared in a controllable manner by manipulating the formation order of the inorganic and organic networks via not only multistep but also single-step processes. When silica particles form a network prior to the PDMAAm network formation, DN ion gels can be prepared. The brittle silica particle network in the DN ion gel, serving as sacrificial bonds, easily ruptures under loading to dissipate energy, while the ductile PDMAAm network maintains the shape of the material by the rubber elasticity. Given the reversible physical bonding between the silica particles, the DN ion gels exhibit a significant degree of self-recovery by annealing.