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

上一个项目的目的是获得PEO网络中聚合物结晶的分子图像，以及网络结构的存在对其的阻碍。我们计划在第二阶段继续这些工作。主要研究溶解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，这些实验将提供结构的详细图片和相图。NMR线形分析和CODEX实验将提供深入了解掺杂聚合物的微晶中的PEO链的分子流动性，这将与离子电导率相关。第二个重点将是与离子连接点的PEO网络的合成，实现了三唑环的烷基化。这些材料很可能具有相当不同的性质，特别是与将通过X射线散射和固态NMR研究的结晶行为有关的性质。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相关。最后，我们计划研究机械变形（拉伸）对结晶行为的影响。我们预计的PEO晶体的螺旋结构的zick-zack构象，可以通过WAXS检测到的相变。温度依赖的NMR实验将提供深入了解拉伸网络的分子流动性。

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.