Highly Robust and Low Frictional Double-Network Ion Gel
Highly Robust and Low Frictional Double-Network Ion Gel
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DOI：
10.1002/admi.201700074
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发表时间：
2017-05-09
影响因子：
5.4
通讯作者：
Sato, Takaya
中科院分区：
文献类型：
--
作者：
Arafune, Hiroyuki;Honma, Saika;Sato, Takaya
减少摩擦对于提高机械系统的寿命和能量效率是重要的。由于具有凝胶状结构的人体关节具有低至10（-3）的摩擦系数，因此凝胶材料被认为是设计低摩擦材料的有用示例。由于离子液体具有较高的热稳定性和可忽略的挥发性，即使在苛刻的条件下也能保持凝胶的溶胀状态，因此，将离子液体作为溶胀剂的离子凝胶有望成为稳定的凝胶润滑剂。在本研究中，我们新合成了一种由离子液体N，N-二乙基-N-（2-甲氧基乙基）-N-甲基双铵三氟甲磺酰亚胺（DEME-TFSI）和由DEME-TFSI的衍生物、聚（N、N-二乙基- N-（2-甲基丙烯酰乙基）-N-甲基双铵（三氟甲基磺酰基）酰亚胺）作为第一网络和中性聚（甲基丙烯酸甲酯）作为第二网络。所获得的DN离子凝胶显示出高的压缩强度，并且其在300 ℃之前是热稳定的。在高温或真空条件下重复测量后的稳定COF表明DN离子凝胶即使在苛刻条件下也具有耐久性。本研究的结果为制备具有高机械强度和鲁棒性的润滑剂凝胶提供了依据，有望成为节能的新候选材料。
Reducing friction is important to improve the lifetime and energy efficiency of mechanical systems. Since human joints with gel-like structure possess a coefficient of friction as low as 10(-3), gel materials are recognized as a useful example for designing low frictional materials. Ion gels incorporating ionic liquids (ILs) as swelling agent is expected to be stable gel lubricant since high thermal stability and negligible volatility of ILs can maintain swelled state of gels even under harsh conditions. In this study, we newly synthesized a double network (DN) ion gel composed of an ionic liquid, N,N-diethyl-N-(2-methoxyethyl)- N-methylammonium bis (trifluoromethylsulfonyl) imide (DEME-TFSI) and an ionic liquid polymer composed of the derivative of DEME-TFSI, poly (N, N-diethyl- N-(2- methacryloylethyl)-N-methylammonium bis (trifluoromethylsulfonyl)imide) as a first network and neutral poly(methyl methacrylate) as a second network. The obtained DN ion gel showed high compression strength and it was thermally stable until 300 degrees C. The stable COF after repeated measurements at high temperature or vacuum conditions showed the durability of DN ion gels even under harsh conditions. The results obtained in this study shed light on the fabrication of lubricant gels with high mechanical strength and robustness, which are expected to be new candidates for enegy conservation.