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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 >Correlation between temperature-pressure dependence of the alpha-relaxation and configurational entropy for a glass-forming polymer
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Correlation between temperature-pressure dependence of the alpha-relaxation and configurational entropy for a glass-forming polymer

机译：α-松弛的温度-压力依赖性与玻璃形成聚合物的构型熵之间的相关性

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In this work we investigated the temperature-pressure dependence of the relaxation time of the alpha-relaxation process of poly(vinyl acetate) (PVAc). By means of dielectric spectroscopy technique the relaxation time of the alpha-process was measured over a broad range of frequencies (10(-1 -) 10(7) Hz), pressures (0-300 MPa) and temperatures (320-460 K). Two different approaches were used to analyze the temperature-pressure dependence of the relaxation time: the phenomenological Vogel-Fulcher-Tammann (VFT) equation and the pressure extended Adam-Gibbs (PEAG) equation recently proposed. We compared both results and discussed the validity of the VFT approach for PVAc at different pressures. We found an excellent agreement between the experimental data and the PEAG equation, which only needs four parameters to describe the complete temperature-pressure dependence of the relaxation time of the alpha-process. Finally, we showed that the thermal and volumetric contributions to the configurational entropy are clearly separated for PVAc. (c) 2005 Elsevier B.V. All rights reserved.
机译：在这项工作中，我们研究了聚醋酸乙烯酯（PVAc）的α松弛过程的弛豫时间的温度-压力依赖性。通过介电谱技术，在很宽的频率范围（10（-1-）10（7）Hz），压力（0-300 MPa）和温度（320-460 K）下测量了Alpha过程的弛豫时间）。两种不同的方法被用来分析弛豫时间对温度-压力的依赖性：最近提出的现象学上的Vogel-Fulcher-Tammann（VFT）方程和压力扩展Adam-Gibbs（PEAG）方程。我们比较了两个结果，并讨论了在不同压力下VFT方法对PVAc的有效性。我们在实验数据和PEAG方程之间找到了极好的一致性，该方程仅需要四个参数来描述α过程的弛豫时间的完整温度-压力依赖性。最后，我们证明了PVAc对构型熵的热和体积贡献明显分开。 （c）2005 Elsevier B.V.保留所有权利。

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