Diffraction Studies of the Structure and Structural Evolution in Conducting Polymers

9305289 Winokur这个项目是对存在于各种典型导电聚合物中的链内和链间分子组织的基础研究。这项工作的主要目标是开发定量准确的模型来描述分子组织，识别在合成或加工过程中出现的这种结构的细微变化，并将这种微观结构变化与电学或质量传输性质的变化联系起来。另一个目标将是阐明这些高度各向异性客体-宿主复合材料中各种竞争相互作用在分子水平上的微妙相互作用所产生的关键尺寸-比例关系和其他新特性。X射线和中子散射将与高度精细的建模算法相结合，这些算法已经进行了修改，以适应聚合物材料固有的特殊结构特征。这个项目是对导电聚合物的基本亚微观结构的深入研究，导电聚合物是一种新的和技术上重要的聚合物类别。目标是开发定量准确的模型来描述分子组织，识别在合成或加工过程中出现的这种结构的细微变化，并最终将这些微观结构变化与其他物理性质(例如导电性、机械强度或质量扩散)的变化相关联。除了解决与导电聚合物及其应用直接相关的问题外，本研究开发的实验探头和数据分析技术将使对更传统的聚合物主体材料的结构进行类似的研究。***

9305289 Winokur This project is a fundamental study of the intrachain and interchain molecular organization existing in various prototypical conducting polymers. The primary goals in this undertaking are to develop quantitatively accurate models for describing the molecular organization, to identify subtle changes in this structure which arise during synthesis or processing and to correlate this microstructural variation with changes in the electrical or mass transport properties. An additional goal will be to elucidate key size-scaling relationships and other novel properties that result from the subtle interplay of various competing interactions at the molecular level within these highly anisotropic guest-host composites. Both x-ray and neutron scattering will be employed in combination with highly refined modeling algorithms which have been modified to accommodate the special structure characteristics intrinsic to polymeric materials. %%% This project is an intensive investigation of the fundamental submicroscopic structure of conducting polymers--a novel and technological important class of polymers. Objectives are to develop quantitatively accurate models for describing the molecular organization, to identify subtle changes in this structure which arise during synthesis or processing, and finally to correlate these microstructural variations with changes in other physical properties (e.g., electrical conductivity, mechanical strength, or mass diffusion). In addition to resolving issues directly related to conducting polymers and their applications, the experimental probes and data analysis techniques developed in this research will enable analogous studies of structure in more conventional polymer host materials. ***