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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 >Relaxations in polystyrene below the glass transition studied by internal friction measurement
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Relaxations in polystyrene below the glass transition studied by internal friction measurement

机译：通过内部摩擦测量研究玻璃化转变温度以下的聚苯乙烯中的弛豫

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摘要

The results of internal friction (1F) measurement for polystyrene made over a wide frequency range of 0.001-10 Hz and in a temperature range of 11-74 degrees C were analyzed. At lower frequencies and higher temperatures, 1F increases when the frequency is decreased, and the increase is larger for higher temperatures; 1F increases when the temperature is increased, and the increase is larger for lower frequencies. These behaviors were explained by the viscosity relaxation based on the Maxwell model causing 1F inversely proportional to frequency and viscosity. The relaxation time was experimentally determined as functions of temperature and frequency. The observed relaxation time could be represented as tau = tau(0)exp(E/k(B)T) (thermal activation); a combination of two relaxations was seen (double relaxation); tau(0) and E were dependent on the frequency; log tau(0) linearly decreased with increasing E (compensation effect). The relaxing elements were considered to jump cooperatively, and the element could be a part of molecular chains in the material. The results of the present study were compared with those obtained from our previous viscosity experiment. (c) 2005 Elsevier B.V. All rights reserved.
机译：分析了在0.001-10 Hz的宽频率范围和11-74摄氏度的温度范围内制得的聚苯乙烯的内摩擦（1F）测量结果。在较低的频率和较高的温度下，频率降低时1F增加，而在较高的温度下增加幅度更大;当温度升高时，1F升高，而对于较低的频率，升高幅度更大。这些行为可以通过基于Maxwell模型的粘度弛豫来解释，从而导致1F与频率和粘度成反比。弛豫时间通过实验确定为温度和频率的函数。观察到的弛豫时间可以表示为tau = tau（0）exp（E / k（B）T）（热激活）;观察到两种松弛的组合（双重松弛）; tau（0）和E取决于频率; log tau（0）随E的增加（补偿效应）线性降低。松弛元素被认为是协同跳跃的，并且该元素可能是材料中分子链的一部分。将本研究的结果与从我们先前的粘度实验获得的结果进行比较。 （c）2005 Elsevier B.V.保留所有权利。

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