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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 >Study of dielectric relaxations in cellulose by combined DDS and TSC
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Study of dielectric relaxations in cellulose by combined DDS and TSC

机译：结合DDS和TSC研究纤维素中的介电弛豫

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In this work, thermally stimulated currents (TSC) analyses combined with dynamic dielectric spectroscopy (DDS) have been applied to the investigation of molecular mobility of cellulose. The correlation between results obtained by both methods allows us to attribute the low temperature DDS relaxation mode to the gamma-mode resolved in TSC. The values of its activation parameters point out that the chain mobility remains localized. At high temperature, the various dielectric relaxation phenomena are separated by applying a recent analytical protocol. The comparison between the activation enthalpy values obtained by DDS and TSC leads to the assignment of the so-called alpha-mode to cooperative movements of polymeric sequences. The Arrhenius behavior of alpha-relaxation time is explained using the strong/fragile pattern. The influence of water content on secondary and primary relaxation modes was examined as well. (c) 2007 Elsevier B.V. All rights reserved.
机译：在这项工作中，热激励电流（TSC）分析与动态介电谱（DDS）相结合已被用于研究纤维素的分子迁移率。两种方法获得的结果之间的相关性使我们可以将低温DDS弛豫模式归因于TSC中解析的伽马模式。其激活参数的值指出，链迁移率保持局部化。在高温下，通过应用最新的分析协议可以分离各种介电弛豫现象。通过DDS和TSC获得的活化焓值之间的比较导致将所谓的α-模式分配给聚合物序列的协同运动。使用强/脆弱模式解释了α松弛时间的Arrhenius行为。还检查了水含量对次要和主要松弛模式的影响。 （c）2007 Elsevier B.V.保留所有权利。

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