• 主题
高级搜索  >
历史搜索 清空历史
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 >Effect of temperature and volume on structural relaxation time: Interpretation in terms of decrease of configurational entropy
【24h】

Effect of temperature and volume on structural relaxation time: Interpretation in terms of decrease of configurational entropy

机译：温度和体积对结构弛豫时间的影响：解释减少结构熵

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We analyze the slowing down of structural relaxation dynamics of two small molecular glass formers and one polymer: o-terphenyl, triphenylchloromethane, and poly(methylmethacrylate). Considering the literature data of expansivity and heat capacity we calculate configurational entropy using a previously proposed relation between the configurational and the excess entropy, and we directly check the Adam and Gibbs theory for glass transition. In particular, we clearly show that using such expression for configurational entropy the predicted linear dependence between the logarithmic of structural relaxation time and the product of temperature with configurational entropy is well satisfied and it does not depend on pressure. Moreover, we also derive an equation for calculating the pressure dependence of the glass transition temperature, which in these systems is in good accordance with the experimental values. (c) 2005 Elsevier B.V. All rights reserved.
机译：我们分析了两种小分子玻璃形成剂和一种聚合物：邻三联苯，三苯基氯甲烷和聚甲基丙烯酸甲酯的结构弛豫动力学的减慢。考虑到膨胀性和热容量的文献数据，我们使用先前提出的构型和过量熵之间的关系来计算构型熵，并且我们直接检查了Adam和Gibbs理论的玻璃化转变。特别是，我们清楚地表明，使用这种表达式进行构型熵预测，可以很好地满足结构弛豫时间的对数与温度与构型熵的乘积之间的线性预测关系，并且它与压力无关。此外，我们还导出了用于计算玻璃化转变温度的压力依赖性的方程式，该方程式在这些系统中很好地符合了实验值。 （c）2005 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号