Poly(ethyleneoxyd) networks: synthesis, network structure and crystallization

聚环氧乙烷网络：合成、网络结构和结晶

• 批准号: 245736274
• 负责人: Professor Dr. Jörg Kreßler
• 金额: --
• 依托单位: Fachgruppe Biophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/245736274?language=en
• 关键词: Poly; ethyleneoxyd; networks; synthesis; network

The aim of the previous project was to obtain a molecular picture of the polymer crystallization in PEO networks and its obstruction by the presence of the network structures. We are planning to continue these works in a 2nd period. A main topic will be to study the effect of dissolved slats on the crystallization behavior and the ionic conductivity. This will be achieved by SAXS and WAXS experiments which will deliver a detailed picture of the structures and a phase diagram. NMR line-shape analysis and CODEX experiments will provide insight into the molecular mobility of the PEO chains in the crystallites of the doped polymer that will be correlated with the ionic conductivity. A second emphasis will be the syntheses of PEO networks with ionic connection points, realized by the alkylation of the triazole rings. It is very likely that these materials will have rather different properties, in particular related to the crystallization behavior that will be investigated by x-ray scattering and solid-state NMR. Ionic conductivity as measured by impedance spectroscopy will be related to the diffusion behavior of the ions, obtained from PFG NMR. At the end, we are planning to investigate the effect of mechanical deformation (stretching) on the crystallization behavior. We expect a phase transition of the helical structure of the PEO crystals into the zick-zack conformation that can be detected by WAXS. Temperature depended NMR experiments will provide insight into the molecular mobility of the stretched networks.

先前项目的目的是获得PEO网络中聚合物结晶的分子图像以及网络结构存在对其的阻碍。我们计划在第二阶段继续这些工作。一个主要的课题将是研究溶解的板条对结晶行为和离子电导率的影响。这将通过SAXS和WAXS实验来实现，这将提供详细的结构图片和相图。核磁共振线形分析和CODEX实验将深入了解掺杂聚合物晶体中PEO链的分子迁移率，这将与离子电导率相关。第二个重点将是合成具有离子连接点的PEO网络，通过三唑环的烷基化实现。这些材料很可能具有相当不同的性质，特别是与结晶行为有关的性质，这将通过x射线散射和固态核磁共振进行研究。通过阻抗谱测量的离子电导率将与从PFG NMR获得的离子的扩散行为有关。最后，我们计划研究机械变形（拉伸）对结晶行为的影响。我们期望PEO晶体的螺旋结构转变为可以通过WAXS检测到的zick-zack构象。温度相关的核磁共振实验将提供深入了解拉伸网络的分子迁移率。