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

本研究的目的是描述在存在和不存在低分子量溶剂分子的情况下，离子对聚合物的节段运动和局部运动的影响。感兴趣的聚合物和盐是那些表现出高离子导电性的，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、多核和变温度核自旋晶格弛豫实验。得到的T1数据将使用聚合物的节段和局部运动的动态模型进行分析。聚合物运动与离子传导之间的关系将通过该技术进行研究。根据动态键渗透理论，聚合物的节段运动有助于聚合物/盐体系中的高离子导电性；某些聚合物和盐之间的相互作用是确定聚合物基材料性质中特定位点相互作用重要性的一个例子。本研究通过动态而非静态的方法来研究特定位点的相互作用，以揭示这些相互作用的影响。最终，本研究的结果将为全面分析理论现状提供基础，并鼓励进一步的理论发展。

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.