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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Temperature and pressure effects on molecular mobility and ionic conductivity in telechelics based on poly(ethylene oxide) capped with hydroxyl groups at both ends
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Temperature and pressure effects on molecular mobility and ionic conductivity in telechelics based on poly(ethylene oxide) capped with hydroxyl groups at both ends

机译：温度和压力对基于两端带有羟基封端的聚环氧乙烷的远距离螯合物分子迁移率和离子电导率的影响

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Functionalized telechelics based on poly(ethylene oxide) capped with OH-groups, with protons (H+) in the terminals have been prepared and the effects of structure on molecular mobility and protonic conductivity have been investigated. Molecular mobility and protonic conductivity were measured by means of broadband dielectric relaxation spectroscopy (10(-2)-10(9) Hz). Pressure effects were also studied by using a multianvil apparatus to generate conditions up to 5 kbar. The features of relaxation, associated to the glass transition, and of dc conductivity sigma(dc), determined from ac conductivity (sigma(ac)(f)) plots, were analysed in detail. Protonic conductivity is governed by the motion of the polymeric chains, however a decoupling between translational and rotational motion is observed, as the temperature decreases towards the glass transition temperature. Dc conductivity was found to decrease with increasing pressure. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 24]
机译：制备了基于羟基封端的聚环氧乙烷，末端带有质子（H +）的功能化远螯化合物，并研究了结构对分子迁移率和质子传导性的影响。分子迁移率和质子电导率通过宽带介电弛豫谱法（10（-2）-10（9）Hz）进行测量。还通过使用多砧装置产生高达5 kbar的条件来研究压力效应。详细分析了与玻璃化转变相关的弛豫特征，以及从交流电导率（sigma（ac）（f））图确定的直流电导率sigma（dc）。质子传导性受聚合物链的运动支配，然而，随着温度朝着玻璃化转变温度降低，观察到了平移运动与旋转运动之间的去耦。发现直流电导率随压力增加而降低。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：24]

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