Crystallization and Structure Formation in Model Polymer Blends

模型聚合物共混物中的结晶和结构形成

• 批准号: 9900638
• 负责人: James Runt
• 金额: $ 27.9万
• 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: 1999
• 资助国家: 美国
• 起止时间: 1999-06-01 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9900638&HistoricalAwards=false
• 关键词: Crystallization; Structure; Formation; Model; Polymer

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.

9900638运行控制聚合物共混物固态微结构和结晶的关键因素与纯净的半结晶体系相比，人们了解得较少，部分原因是此类混合物本身的复杂性。PI(主要使用小角X射线散射测量)最近对含有弱相互作用和强相互作用的无定形聚合物的模型熔融共混体系的工作提供了对这些体系最终微结构的影响因素的洞察。这项初步工作以及其他初步实验为进一步研究指明了一些重要方向。拟议的研究分为两个主要领域。主要的重点是发展对模型共混物中聚氧乙烯[PEO]结晶和微结构发展的基本了解。这方面的工作将主要利用同时进行的小角和广角X射线散射实验来进行。此外，PI还将对PEO在共混物中的球晶生长动力学进行平行研究，特别是强调强烈的分子间相互作用的影响。第二个焦点领域涉及单晶和熔晶PEO及其共混物的固态结构与其介电松弛行为之间的关系。从这项工作中得出的原则应该是完全通用的，并为多组分聚合物体系中性能的最佳剪裁提供基础。