Structure and Dynamics of Polymer Mixtures

聚合物混合物——共混物、共聚物及其组合物——是越来越重要的优质高分子材料来源。确定了四个具体的项目领域。第一个问题涉及段重排的潜在时间尺度，它通过单体摩擦因子影响所有动态特性。第二个项目将研究示踪剂在弱分离共聚物和共混物中的扩散。第三个重点是更强分离的结构，即有序态的嵌段共聚物，以及其中的共聚物、均聚物和小分子探针的示踪扩散。最后一个感兴趣的领域是溶剂浓度和质量在确定嵌段共聚物所采用的形态中的作用。特别强调的是不断变化的溶剂选择性，部分是通过混合溶剂来实现的。这项研究将导致对聚合物和共聚物混合物中聚合物链的结构和相互作用的基本理解，并扩展到可加工性和性能优化。* * *

9528481 Lodge Polymer mixtures - blends, copolymers, and combinations thereof - are an increasingly important source of superior macromolecular materials. Four specific project areas are identified. The first concerns the underlying timescale for segmental rearrangements, which impacts all dynamic properties through the monomeric friction factor. A second project will examine tracer diffusion in weakly-segregated copolymers and blends. The third thrust emphasizes more strongly-segregated structures, namely block copolymers in the ordered state, and the tracer diffusion of copolymers, homopolymers, and small molecule probes therein. The final area of interest is the role of solvent concentration and quality in determining the morphologies adopted by block copolymers. Particular emphasis will be placed on continuously-variable solvent selectivity, to be achieved in part via mixed solvent. %%% This research will lead to fundamental understanding of structures and interactions of polymer chains in mixtures of polymers and copolymers with extensions on processability and property optimization. ***