Effect of Salt on the Dynamics of Polymers Measured by Nuclear Magnetic Resonance

这项研究的目的是描述在存在和不存在低分子溶剂分子的情况下，离子对聚合物的链段和局部运动的影响。感兴趣的聚合物和盐是那些表现出高离子导电性的聚合物和盐，如聚环氧乙烷和高氯酸锂。将在不同的聚合物/盐体系上进行多场、多核和变温核自旋晶格驰豫实验。生成的T1数据将使用聚合物的分段和局部运动的动态模型进行分析。这项技术将用来研究聚合物运动和离子导电性之间的关系。根据动态键渗流理论，聚合物的链段运动有助于聚合物/盐体系的高离子导电性；某些聚合物和盐之间的相互作用是特定部位相互作用在决定聚合物材料性能方面的重要性的一个例子。本研究通过动态而不是静态的方法研究特定地点的交互作用，以揭示这些交互作用的影响。最终，本研究的结果将为全面分析理论的现状提供基础，并鼓励理论的进一步发展。

The objective of this research is to describe the effect of ions on the segmental and local motions of polymers in the presence and absence of low-molecular-weight solvent molecules. The polymers and salts of interest are those that exhibit high ionic conduction such as poly(ethylene oxide) and lithium perchlorate. Multifield, multinuclear, and variable temperature nuclear spin lattice relaxation experiments will be performed on different polymer/salt systems. The resulting T1 data will be analyzed using dynamic models for the segmental and local motions of the polymer. The relationship between polymer motion and ionic conduction will be investigated by this technique. Segmental motion of the polymer contributes to high ionic conduction in polymer/salt systems according to dynamic bond percolation theory;. The interaction between certain polymers and salts is an example of the importance of site-specific interactions in determining the properties of polymer-based materials. This study investigates site-specific interactions by a dynamic rather than static approach to reveal the impact of these interactions. Ultimately, the results of this research will provide the basis for a comprehensive analysis of the present state of theory and encourage further theoretical development.