...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Journal of Chemical Physics >Glassy dynamics of two poly(ethylene glycol) derivatives in the bulk and in nanometric confinement as reflected in its inter- and intra-molecular interactions
【24h】

Glassy dynamics of two poly(ethylene glycol) derivatives in the bulk and in nanometric confinement as reflected in its inter- and intra-molecular interactions

机译：两种聚（乙二醇）衍生物的玻璃状动态和纳米限制在其间和分子间相互作用中反映

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

The inter-and intra-molecular interactions as they evolve in the course of glassy solidification are studied by broadband dielectric-and Fourier-transform infrared-spectroscopy for oligomeric derivatives of poly(ethylene glycol) derivatives, namely, poly(ethylene glycol) phenyl ether acrylate and poly(ethylene glycol) dibenzoate in the bulk and under confinement in nanoporous silica having mean pore diameters 4, 6, and 8 nm, with native and silanized inner surfaces. Analyzing the spectral positions and the oscillator strengths of specific IR absorption bands and their temperature dependencies enables one to trace the changes in the intra-molecular potentials and to compare it with the dielectrically determined primarily inter-molecular dynamics. Special emphasis is given to the calorimetric glass transition temperature T-g and T-alpha beta approximate to 1.25T(g), where characteristic changes in conformation appear, and the secondary beta-relaxation merges with the dynamic glass transition (alpha-relaxation). Furthermore, the impact of main chain conformations, inter-and intra-molecular hydrogen bonding, and nanometric confinement on the dynamic glass transition is unraveled. Published by AIP Publishing.
机译：通过宽带电介质和傅立叶 - 转化红外光谱研究聚（乙二醇）衍生物的寡聚衍生物，研究了玻璃状凝固过程中的间歇分子相互作用，即聚（乙二醇）苯基醚丙烯酸酯和聚（乙二醇）在体积中的二苯甲酸酯，并在纳米多孔二氧化硅中的限制，其具有平均孔径4,6和8nm，具有天然和硅烷化的内表面。分析特定IR吸收带的光谱位置和振荡器强度及其温度依赖性使得能够追踪分子内电位的变化，并将其与主要间分子间动态的介电确定。特别强调热量玻璃化转变温度T-G和T-αβ近似约为1.25t（g），其中表现的特征变化，并且具有动态玻璃转变（α-松弛）的次级β松弛合并。此外，解开主链构象，和分子间氢键合和纳米判集对动态玻璃化转变的影响。通过AIP发布发布。

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