Viscoelastic Properties, Ionic Conductivity, and Materials Design Considerations for Poly(styrene-b-ethylene oxide-b-styrene)-Based Ion Gel Electrolytes
Viscoelastic Properties, Ionic Conductivity, and Materials Design Considerations for Poly(styrene-b-ethylene oxide-b-styrene)-Based Ion Gel Electrolytes
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DOI：
10.1021/ma201356j
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发表时间：
2011-10
期刊：
影响因子：
5.5
通讯作者：
Sipei Zhang;Keun Hyung Lee;Jingru Sun;C. Frisbie;T. Lodge
中科院分区：
文献类型：
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作者：
Sipei Zhang;Keun Hyung Lee;Jingru Sun;C. Frisbie;T. Lodge
基于聚乙烯自组装的离子凝胶的粘弹性能和离子导电性（苯乙烯-b-环氧乙烷-b-苯乙烯）（SOS）三嵌段共聚物（Mn，S = 3kDa，Mn，O = 35 kDa）在离子液体1-乙基-3-甲基咪唑双中在10- 50wt%SOS的组成范围和25-160 °C的温度范围内研究了（三氟甲基磺酰基）酰胺（[EMI][TFSA]）。聚（苯乙烯）（PS）的末端嵌段缔合成胶束，而聚（环氧乙烷）（PEO）的中间嵌段被这种离子液体很好地溶剂化。具有10重量% SOS的离子凝胶在54 °C下熔化，其中最长的弛豫时间表现出与本体PS的粘度相似的温度依赖性。然而，凝胶弛豫时间的实际值比本体PS的弛豫时间大4个数量级以上。这归因于将PS末端嵌段拉过PEO/[EMI][TFSA]基质的热力学惩罚。SOS含量为20- 50wt%的离子凝胶在贮存过程中不熔化，并出现两个平台期。
The viscoelastic properties and ionic conductivity of ion gels based on the self-assembly of a poly(styrene-b-ethylene oxide-b-styrene) (SOS) triblock copolymer (Mn,S = 3 kDa, Mn,O = 35 kDa) in the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([EMI][TFSA]) were investigated over the composition range of 10–50 wt % SOS and the temperature range of 25–160 °C. The poly(styrene) (PS) end-blocks associate into micelles, whereas the poly(ethylene oxide) (PEO) midblocks are well-solvated by this ionic liquid. The ion gel with 10 wt % SOS melts at 54 °C, with the longest relaxation time exhibiting a similar temperature dependence to that of the viscosity of bulk PS. However, the actual values of the gel relaxation time are more than 4 orders of magnitude larger than the relaxation time of bulk PS. This is attributed to the thermodynamic penalty of pulling PS end-blocks through the PEO/[EMI][TFSA] matrix. Ion gels with 20–50 wt % SOS do not melt and show two plateaus in the storage mo...