Preparation of tough, thermally stable, and water-resistant double-network ion gels consisting of silica nanoparticles/poly(ionic liquid)s through photopolymerisation of an ionic monomer and subsequent solvent removal
Preparation of tough, thermally stable, and water-resistant double-network ion gels consisting of silica nanoparticles/poly(ionic liquid)s through photopolymerisation of an ionic monomer and subsequent solvent removal
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DOI：
10.1039/c9sm02213a
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发表时间：
2020-02-14
期刊：
影响因子：
3.4
通讯作者：
Ono, Tsutomu
中科院分区：
文献类型：
--
作者：
Watanabe, Takaichi;Takahashi, Ruri;Ono, Tsutomu
我们报道了坚韧、热稳定且防水的双网络（DN）离子凝胶的制备方法，该凝胶由部分簇状二氧化硅纳米粒子网络和容纳离子液体的聚（离子液体）（PIL）网络组成。二氧化硅纳米粒子/聚([Evim][Tf2N])DN离子凝胶是通过在含有二氧化硅纳米粒子、[Bmim][Tf2N]、离子液体基交联剂[(VIM)(2)C-4][Tf2N](2)和乙酸乙酯的混合物中进行[Evim][Tf2N]的光诱导自由基聚合，然后蒸发溶剂来制备的。拉伸强度测量表明，PIL DN 离子凝胶的机械性能高于 PIL 单网络 (SN) 离子凝胶。流变学研究表明，当二氧化硅纳米粒子在 [Bmim][Tf2N] 中形成部分簇时，可以增强 PIL DN 离子凝胶的机械强度。 PIL DN 离子凝胶的循环应力-应变测量显示出磁滞回线，表明当 PIL DN 离子凝胶经历大变形时，二氧化硅纳米粒子簇破裂并耗散负载能量。 PIL DN 离子凝胶的断裂强度和杨氏模量随着二氧化硅纳米粒子直径的减小而增加。热重分析测量表明，PIL DN离子凝胶具有约400℃的高分解温度。此外，溶胀测试表明，由于PIL骨架的疏水性，PIL DN离子凝胶具有优异的防水性能。我们相信，这种坚韧、热稳定且防水的 PIL DN 离子凝胶可用作软机器人的二氧化碳分离膜、传感器和执行器。
We report the preparation of tough, thermally stable, and water-resistant double-network (DN) ion gels, which consist of a partially-clustered silica nanoparticle network and poly(ionic liquid) (PIL) network holding an ionic liquid. Silica nanoparticles/poly([Evim][Tf2N]) DN ion gels are prepared by photo-induced radical polymerisation of [Evim][Tf2N] in a mixture containing silica nanoparticles, [Bmim][Tf2N], ionic liquid based cross-linker [(VIM)(2)C-4][Tf2N](2), and ethyl acetate, followed by subsequent solvent evaporation. Tensile strength measurements show that the mechanical properties of the PIL DN ion gels were higher than those of the PIL single-network (SN) ion gel. A rheological study indicates that an enhancement in mechanical strength of the PIL DN ion gels can be achieved when silica nanoparticles form partial clusters in [Bmim][Tf2N]. The cyclic stress-strain measurement of the PIL DN ion gels shows hysteresis loops, suggesting that the silica nanoparticle clusters rupture and dissipate the loading energy when the PIL DN ion gels undergo a large deformation. The fracture strength and Young's modulus of the PIL DN ion gels increase as the diameter of the silica nanoparticles is decreased. Thermogravimetric analysis measurement shows that the PIL DN ion gel has a high decomposition temperature of approximately 400 degrees C. Moreover, the swelling test shows that the PIL DN ion gel possesses an excellent water-resistant property because of the hydrophobic nature of the PIL backbone. We believe that such tough, thermally stable, and water-resistant PIL DN ion gels can be used as carbon dioxide separation membranes, sensors, and actuators for soft robotics.