Dynamics and Phase Equilibra of Polymers: Finite Size Effects

绿色9705101本研究的总体目标是发展的微观理解的限制和表面和界面上的动态和相稳定性的聚合物薄膜混合物的影响。 该策略是使用有关界面的信息作为探针来了解相稳定性和动力学。 该策略的一个关键方面集中在独立地“调节”基底和聚合物的分子参数，以便控制分子相互作用。 这将涉及新的降冰片烯类聚合物与不同的功能，合成新的无机碲二氧化物为基础的玻璃，其反应性可以定制和硅基板的表面处理的新的合成。 该研究分为两部分，第一部分涉及使用可变角椭圆偏振光谱（VASE）和前向反冲光谱（FRES）的组合来研究不同厚度的均聚物双层膜之间的界面厚度的发展，L。 从平衡界面厚度从这方面的研究中了解到的信息将深入了解共聚物（无规和二嵌段）对混合物的相稳定性的影响。 该提案的第二阶段涉及润湿层的形成和共存相在这些聚合物的混合物中的不同特性的基板接触的相关研究，以深入了解的“界面”字段上的润湿层的形成和生长的均聚物混合物的作用。 这项工作的另一个方面是使用有关润湿层的信息，以开发新的见解的影响共聚物的薄膜混合物的相稳定性。 由于薄膜聚合物在许多技术中起着“主动”和“被动”作用，因此对这一领域的兴趣受到技术需求的推动。 例如，它们在微传感器、大面积发光显示器和选择性膜应用中起到“主动”作用。 “被动”应用包括用作磁存储介质的保护涂层和润滑剂、生物相容性和用作薄膜粘合剂。 由于本体性能的信息提供有限的指导，这是至关重要的，以发展在这些条件下的聚合物性能的基本理解。 ***

Green 9705101 The overall goal of this study is the development of a microscopic understanding of the effects of confinement and of surfaces and interfaces on the dynamics and phase stability of polymeric thin film mixtures. The strategy is to use information about the interface as a probe to understand the phase stability and dynamics. A critical aspect of this strategy is focused at independently "tuning" the molecular parameters of the substrate and of the polymers in mrder to have control over the molecular interactions. This will involve novel synthesis of new norborene-like polymers with varying functionalities, synthesis of novel inorganic tellurium dioxide-based glasses whose reactivity can be tailored and surface treatments of a silicon substrate. The proposed study is divided into two parts, the first of which involves using a combination of variable angle spectroscopic ellipsometry (VASE) and forward recoil spectrometry (FRES) to study the development of the interfacial thickness between homopolymer bilayers of varying thickness, L. Information learned from the equilibrium interfacial thickness from this aspect of the study will give insight into the effect of copolymers (random and diblock) on the phase stability of the mixtures. The second phase of this proposal involves a related study of the formation of wetting layers and coexistence phases in mixtures of these polymers in contact with the substrates of varying characteristics in order to gain insight into the role of the "interfacial" fields on the formation and growth of the wetting layer in homopolymer mixtures. An additional aspect of this work is to use information about the wetting layer to develop new insights into the effect of copolymers on the phase stability of the thin film mixtures. %%% Interest in this area is motivated by technological need since thin film polymers serve "active" and "passive" roles in many technologies. For example, they serve "active" roles in microsen sors, large area light emitting displays and selective membrane applications. "Passive" applications include use as protective coatings and lubricants for magnetic storage media, biocompatibility and use as thin film adhesives. Because information about bulk properties provides limited guidance, it is critical to develop a fundamental understanding of polymeric properties under these conditions. ***