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Molecular mobility and Li+ conduction in polyester copolymer ionomersbased on poly(ethylene oxide)

机译:基于聚环氧乙烷的聚酯共聚物离聚物的分子迁移率和Li +传导

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摘要

We investigate the segmental and local dynamics as well as the transport of Li+ cations in a seriesof model poly(ethylene oxide)-based single-ion conductors with varying ion content, usingdielectric relaxation spectroscopy. We observe a slowing down of segmental dynamics and anincrease in glass transition temperature above a critical ion content, as well as the appearance of anadditional relaxation process associated with rotation of ion pairs. Conductivity is strongly coupledto segmental relaxation. For a fixed segmental relaxation frequency, molar conductivity increaseswith increasing ion content. A physical model of electrode polarization is used to separate ionicconductivity into the contributions of mobile ion concentration and ion mobility, and a model for theconduction mechanism involving transient triple ions is proposed to rationalize the behavior of thesequantities as a function of ion content and the measured dielectric constant.
机译:我们使用介电弛豫谱研究了一系列具有不同离子含量的模型聚(环氧乙烷)基单​​离子导体中的分段和局部动力学以及Li +阳离子的传输。我们观察到节段动力学的减慢和玻璃化转变温度在临界离子含量以上的升高,以及与离子对旋转相关的附加弛豫过程的出现。电导率与节段松弛密切相关。对于固定的分段弛豫频率,摩尔电导率随离子含量的增加而增加。使用电极极化的物理模型将离子电导率分为移动离子浓度和离子迁移率的贡献,并提出了涉及瞬态三重离子的传导机理模型,以合理化这些量随离子含量和所测介电常数的变化不变。

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