RUI: Synthesis and Characterization of Dicarboximide-functionalized Oxanorbornyl Polymers for Use in Ion Transport Membranes

技术概要：将合成新材料，以改善锂离子电池中固体聚合物电解质载体的功能和安全性。基于两种类型的二甲酰亚胺氧杂降冰片基单体的聚合物将使用开环复分解技术合成，产生相当刚性和庞大的主链。该主链可有助于更有效地将离子运动与聚合物链段运动解耦。 将研究具有不同长度的环氧乙烷侧链和分子量的聚合物以最大化锂离子电导率。因此，优化的单体将与具有显著更高的玻璃化转变温度的第二单体结合到二嵌段和无规共聚物中。将在离子电导率与由于较高玻璃化转变单体而增加的模量平衡的组合物下评价无规共聚物。将研究具有使用最佳环氧乙烷侧链的一个嵌段和具有高玻璃化转变的另一个嵌段的二嵌段共聚物体系的相图，以理解微相分离形态（例如，圆柱体或圆柱体）可能有益于离子导电性。聚合物结构和动力学的表征将包括介电光谱、X射线和中子散射、原子力显微镜，可能还有固态NMR。这项研究还包括一个共享组件，其中一些表征将在NSF资助的设备上进行，并与其他大学和国家用户设施实验室的合作者进行。本科生研究人员将在三年的时间内开展这项研究。非技术性总结：本研究项目将创造和研究战略定制材料，用作锂离子电池的隔膜。这些新膜可能会提高锂离子电池的安全性和性能，从而有利于更好、更安全的储能系统的需求。这些新材料可能使锂电池更轻，更小，并且由比传统材料更不易燃的材料制成。这项研究将包括一些更广泛的影响。我们未来的科学工作者将受益于直接参与和教育的本科生在本研究的各个方面。将与其他地方和国家大学的科学家建立合作关系，在这些研究中将利用联邦政府支助的国家用户设施，如橡树岭国家实验室。此外，将通过涉及数学、工程和科学成就（梅萨）计划的外联活动，增加代表性不足的高中生对科学的接触。这些活动将包括指导本科研究生在聚合物科学体验式学习活动，化学演示，现代科学仪器的演示。

TECHNICAL SUMMARY:New materials will be synthesized with the goal of improving the function and safety of solid polymer electrolyte supports in lithium ion batteries. Polymers based on two types of dicarboximide oxanorbornyl monomers will be synthesized using ring opening metathesis techniques creating a fairly rigid and bulky backbone. This backbone may assist in more effectively decoupling ionic motion from polymer segmental motion. Polymers with varying lengths of ethylene oxide side chains and molecular weights will be investigated to maximize lithium ion conductivity. Accordingly, the optimized monomers will be incorporated into diblock and random copolymers with a second monomer that has a substantially higher glass transition temperature. The random copolymers will be evaluated at compositions where the ionic conductivity is balanced with increased modulus due to the higher glass transition monomer. The phase diagram of a diblock copolymer system with one block using the optimal ethylene oxide side chain and the other block having a high glass transition will be studied to understand how the microphase separated morphology (e.g., lamellae or cylinder) might benefit ionic conductivity. Characterization of the polymer structure and dynamics will include dielectric spectroscopy, X-ray and neutron scattering, atomic force microscopy, and possibly solid-state NMR. This research also includes a shared component where some of the characterization will be conducted on NSF funded equipment and with collaborators at other universities, and at national user facility laboratories. Undergraduate student researchers will carry out this research over the course of three years.NON-TECHNICAL SUMMARY:This research project will create and study strategically tailored materials for use as membranes in lithium ion batteries. These new membranes may lead to improved safety and performance in lithium ion batteries, benefiting the growing necessity for better and safer energy storage systems. These new materials might allow lithium batteries to be lighter, smaller, and constructed out of materials that are much less flammable than conventional materials. This research will include a number of broader impacts. Our future scientific work force will be benefited by direct involvement and education of undergraduate students in all aspects of this research. Collaborations will be established with scientists at other local and national universities, and federally supported national user facilities will be utilized in these studies such as Oak Ridge National Laboratory. Also, increased exposure of underrepresented high school students to science will take place through outreach activities involving the Mathematics, Engineering, and Science Achievement (MESA) program. These activities will include mentoring by undergraduate research students in polymer science experiential learning activities, chemical demonstrations, and demonstrations of modern scientific instrumentation.