Crystallization and Structure Formation in Model Polymer Blends

9900638 Runt控制聚合物共混物的固态微观结构和结晶的关键因素不如纯半结晶体系的那些因素那么清楚，部分原因是这种混合物固有的复杂性。最近的工作PI（主要使用小角度X射线散射测量）模型熔融混溶共混物含有弱相互作用和强相互作用的无定形聚合物提供了深入了解这些系统中的最终微观结构的影响因素。这项初步工作，沿着其他初步实验，指出了一些重要的方向，为进一步的研究。拟议的研究福尔斯分为两个主要领域。主要的重点是发展的结晶和微观结构的发展模型共混物中的聚（环氧乙烷）[PEO”的基本理解。这方面的工作将主要使用同时进行的小角度和广角X射线散射实验。此外，PI将进行共混物中PEO球晶生长动力学的平行研究，特别强调强分子间相互作用的影响。第二个重点领域涉及的单晶和熔融结晶的PEO和共混物的固态结构之间的关系，和它们的介电弛豫行为。从这项工作中得出的原则应该是完全通用的，并提供了多组分聚合物系统的性能的最佳剪裁的基础。

9900638RuntThe key factors controlling the soid-state microstructure and crystallization of polymer blends are less well understood than those of neat semi-crystalline systems, due in part to the inherent complexity of such mixtures. Recent work by the PI (using principally small angle x-ray scattering measurements) on model melt-miscible blends containing weakly-and strongly-interacting amorphous polymers has provided insight into the factors that influence the final microstructure in these systems. This initial work, along with other preliminary experiments, point to a number of important directions for further research.The proposed research falls into two main areas. The primary focus is on developing a fundamental understanding of crystallization and microstructure development of poly(ethylene oxide) [PEO" in model blends. This aspect of the work will be conducted primarily using simultaneous small-and wide-angle x-ray scattering experiments. In addition, the PI will undertake a parallel study of the kinetics of spherulitic growth of PEO in blends, with particular emphasis on the influence of strong intermolecular interactions. The second focus area concerns the relationship between the solid-state structure of single crystalline and melt-crystallized PEO and blends, and their dielectric relaxation behavior. The principles derived from this work should be completlely general and provide a basis for optimal tailoring of properties in multicomponent polymer systems.