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首页> 外文期刊>ACS Macro Letters >Relationship between Segmental Dynamics Measured by Quasi-Elastic Neutron Scattering and Conductivity in Polymer Electrolytes
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Relationship between Segmental Dynamics Measured by Quasi-Elastic Neutron Scattering and Conductivity in Polymer Electrolytes

机译:准塑性中子散射测量的分段动力学与聚合物电解质中的电导率之间的关系

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摘要

Quasi-elastic neutron scattering experiments on mixtures of poly(ethylene oxide) and lithium bis-(trifluoromethane)sulfonimide salt, a standard polymer electrolyte, led to the quantification of the effect of salt on segmental dynamics in the 1-10 angstrom length scale. The monomeric friction coefficient characterizing segmental dynamics on these length scales increases exponentially with salt concentration. More importantly, we find that this change in monomeric friction alone is responsible for all of the observed nonlinearity in the dependence of ionic conductivity on salt concentration. Our analysis leads to a surprisingly simple relationship between macroscopic ion transport in polymers and dynamics at monomeric length scales.
机译:用于聚(环氧乙烷)和双 - (三氟甲烷)磺酰亚胺盐,标准聚合物电解质的混合物的准弹性中子散射实验导致盐在1-10埃长尺中的节段性动力学的效果。 在这些长度尺度上表征节段动力学的单体摩擦系数随盐浓度的呈指数增加。 更重要的是,我们发现单独的单体摩擦的这种变化是对离子电导率对盐浓度的依赖性的所有观察到的非线性负责。 我们的分析导致宏观离子转运在单体长度尺度的聚合物和动力学之间的令人惊讶的简单关系。

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