He Yiyong, Boswell Paul G, Bühlmann Philippe, Lodge Timothy P
Department of Chemistry, University of Minnesota, 207 Pleasant Street SE Minneapolis, Minnesota 55455, USA.
J Phys Chem B. 2007 May 10;111(18):4645-52. doi: 10.1021/jp064574n.
We report a new way of developing ion gels through the self-assembly of a triblock copolymer in a room-temperature ionic liquid. Transparent ion gels were achieved by gelation of a poly(styrene-block-ethylene oxide-block-styrene) (SOS) triblock copolymer in 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) with as low as 5 wt % SOS triblock copolymer. The gelation behavior, ionic conductivity, rheological properties, and microstructure of the ion gels were investigated. The ionic conductivity of the ion gels is only modestly affected by the triblock copolymer network. Its temperature dependence nearly tracks that of the bulk ionic liquid viscosity. The ion gels are thermally stable up to at least 100 degrees C and possess significant mechanical strength. The results presented here suggest that triblock copolymer gelation is a promising way to develop highly conductive ion gels and provides many advantages in terms of variety and processing.
我们报道了一种通过三嵌段共聚物在室温离子液体中自组装来制备离子凝胶的新方法。通过在六氟磷酸1-丁基-3-甲基咪唑鎓（[BMIM][PF6]）中使聚（苯乙烯-嵌段-环氧乙烷-嵌段-苯乙烯）（SOS）三嵌段共聚物凝胶化，以低至5 wt%的SOS三嵌段共聚物实现了透明离子凝胶。研究了离子凝胶的凝胶化行为、离子电导率、流变学性质和微观结构。离子凝胶的离子电导率仅受到三嵌段共聚物网络的适度影响。其温度依赖性几乎与本体离子液体粘度的温度依赖性一致。离子凝胶在至少100℃下热稳定，并具有显著的机械强度。此处给出的结果表明，三嵌段共聚物凝胶化是开发高导电性离子凝胶的一种有前途的方法，并且在种类和加工方面具有许多优势。
