Dynamics of Precise Ethylene Copolymers and Ionomers Using Dielectric Spectroscopy

使用介电谱分析精确乙烯共聚物和离聚物的动力学

• 批准号: 1206571
• 负责人: James Runt
• 金额: $ 38.4万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-06-01 至 2015-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1206571&HistoricalAwards=false
• 关键词: Dynamics; Precise; Ethylene; Copolymers; Ionomers

TECHNICAL SUMMARY:This project will explore the fundamental dynamics of a new class of polymer system: copolymers with monodisperse ethylene sequences between very precisely spaced acid (or ionic) functionalities. Motivated by the recent synthesis and self-assembly of poly(ethylene-acrylic acid) [PEAA] precise copolymers and ionomers this study will focus on the comprehensive investigation of polymer and ion dynamics of these novel materials using primarily broadband dielectric spectroscopy. Recent findings demonstrate that these materials exhibit considerably less heterogeneity than traditional ethylene-based copolymers with randomly placed functionality. Significantly narrower dielectric relaxations are anticipated, making these ideal model materials for the fundamental study of polymer dynamics. The role that highly regular self-assembly of ionic domains has on ion transport will be investigated in order to determine whether precise ethylene ionomers offer a unique route to mechanically robust, yet highly conductive, solid polymer membranes. As there is an intimate connection between phase-separated microstructure and molecular dynamics, a thorough understanding of the nanoscale structure of the precise ethylene copolymers and ionomers is required. Consequently, an important component of this project involves collaborations with other institutions on morphological and moedling aspects of these new materials.NON-TECHNICAL SUMMARY:This project focuses on the systematic investigation of polymer and ion motions in a new class of molecularly precise polymeric materials. The study will also enhance the basic understanding of ion transport in solid polymers, of interest for the next generation of membranes for lithium ion batteries, actuators, and other potential applications. Ethylene-based polymers are of strategic industrial importance, representing the largest class of commercial polymers. As this project is the first to investigate polymer and ion motions of precise ethylene-based acid copolymers and ionomers, it will assist in evaluating the commercial potential of these new materials.The project will create learning opportunities for graduate and undergraduate students, the latter participating through senior thesis projects or as part of the NSF-REU Program at Penn State on soft materials. Program participants will engage in outreach activities, particularly those connected with Penn State's Women in Science and Engineering Institute.

技术摘要：本项目将探索一类新的聚合物体系的基本动力学：具有单分散乙烯序列的共聚物，这些序列位于非常精确间隔的酸（或离子）官能团之间。最近的合成和自组装的聚（乙烯-丙烯酸）[PEAA]精确的共聚物和离聚物的动机，本研究将集中在这些新材料的聚合物和离子动力学的综合调查，主要使用宽带介电谱。最近的研究结果表明，这些材料表现出相当少的异质性比传统的乙烯基共聚物与随机放置的功能。预期介电弛豫显著变窄，使得这些理想的模型材料用于聚合物动力学的基础研究。将研究离子域的高度规则自组装对离子传输的作用，以确定精确的乙烯离聚物是否为机械坚固且高导电的固体聚合物膜提供了一种独特的途径。由于相分离的微观结构和分子动力学之间有着密切的联系，因此需要对精确的乙烯共聚物和离聚物的纳米级结构有深入的了解。因此，该项目的一个重要组成部分涉及与其他机构的合作，对这些新材料的形态和moedling方面。非技术摘要：该项目的重点是在一类新的分子精确的聚合物材料的聚合物和离子运动的系统调查。该研究还将增强对固体聚合物中离子传输的基本理解，这对下一代锂离子电池，致动器和其他潜在应用的膜感兴趣。 乙烯基聚合物具有战略工业重要性，代表了最大类别的商业聚合物。由于该项目是第一个研究精确的乙烯基酸共聚物和离聚物的聚合物和离子运动的项目，它将有助于评估这些新材料的商业潜力。该项目将为研究生和本科生创造学习机会，后者将通过高级论文项目或作为宾夕法尼亚州立大学NSF-REU软材料项目的一部分参与。方案参与者将参加外联活动，特别是与宾夕法尼亚州立大学妇女科学和工程研究所有关的活动。