EAPSI: Elucidating the Role of Ionic Aggregate Structure on Polymer Dynamics for Charge Transport Applications

全球和美国的能源消耗每年都在增加，因此大量的研究工作致力于改进下一代能源解决方案，以满足需求并提高效率。目前，人们对含酸和含离子聚合物非常感兴趣，因为这类聚合物可以用于下一代电池、薄膜电容器和燃料电池中的质子交换膜。这个项目的目标是在一个模型含离子聚合物系统中获得离子运动和聚合物动力学之间耦合的基本理解。为了优化离子传输动力学，这是这些应用中至关重要的性能瓶颈，人们必须了解这种耦合的性质。野崎龙助博士在复杂液体物理方面的专业知识和仪器能力？他在日本北海道大学的实验室对于研究这类聚合物的动力学至关重要。这些聚合物激发了人们对离聚体和其他带有酸、离子和极性基团的聚合物的兴趣？选择性输送带电物质的能力。介质弛豫光谱（DRS）将用于研究一系列与金属盐（如锂）中和的同源酸共聚物的各种弛豫。DRS将在离子传导和聚合物运动的时间尺度上测量弛豫。该技术将与最近合成的一类具有高水平分子控制的酸共聚物相结合，在合成过程中探测聚合物和离子之间运动的耦合。这些精确的共聚物和离聚体提供了前所未有的分子控制，产生了明确的形态，从而促进了对结构-性能关系的更好理解。具体来说，离散和渗透离子聚集形态之间的差异将被研究，目的是加速离子运动相对于聚合物动力学。NSF EAPSI奖是与日本科学促进会合作资助的。

Global and US energy consumption increases every year and consequently substantial research efforts have been devoted to improving next-generation energy solutions to keep up with demand and improve efficiency. Currently, there is intense interest in acid-containing and ion-containing polymers as this class of polymers could enable the next generation of batteries, thin film capacitors, and proton exchange membranes in fuel cells. The goal of this project is to gain fundamental understanding of the coupling between ion motion and polymer dynamics in a model ion-containing polymer system. To optimize the ion transport kinetics, a performance bottleneck in these critically important to applications, one must understand the nature of this coupling. The specific expertise in the physics of complex liquids and instrumental capabilities of Dr. Ryusuke Nozaki?s lab at Hokkaido University in Japan will be essential to investigate dynamics in this class of polymers.Interest in ionomers and other polymers with acid, ionic and polar groups is fueled by these polymers? ability to selectively transport charged species. Dielectric relaxation spectroscopy (DRS) will be used to investigate the various relaxations in a series of homologous acid copolymers neutralized with metal salts such as lithium. DRS will measure relaxations on the timescales of ion conduction and polymer motion. This technique will be combined with a recently synthesized category of acid copolymers with high levels of molecular control during synthesis to probe the coupling of motion between polymer and ion. These precise copolymers and ionomers provide unprecedented molecular control that produces well-defined morphologies and thereby facilitate the improved understanding of structure-property relationships. Specifically, the differences between discrete and percolated ionic aggregate morphologies will be investigated with the goal of accelerating ion motion relative to polymer dynamics. This NSF EAPSI award is funded in collaboration with the Japan Society for the Promotion of Science.