Polymer Dynamics at Interfaces and in Complex Environments

界面和复杂环境中的聚合物动力学

• 批准号: 0907018
• 负责人: Steve Granick
• 金额: $ 65.5万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-05-01 至 2015-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0907018&HistoricalAwards=false
• 关键词: Polymer; Dynamics; Interfaces; Complex; Environments

TECHNICAL SUMMARY This research focuses on a central problem of polymer physics ? how polymers diffuse along the solid-liquid interface and in confined geometries. This will be studied using novel experimental platforms of fluorescence spectroscopy, sometimes with single-molecule resolution (FCS, fluorescence correlation spectroscopy), sometimes with FRAP (fluorescence recovery after photobleaching), sometimes with FRET (Förster resonance energy transfer), sometimes with single-particle imaging. As implemented, these experiments will yield spatially-resolved measurements with spatial resolution 0.5 μm. The research will focus on the polymer side of the interface ? the dependence of polymer translational diffusion on chain length, polymer surface coverage, and in the case of confined polymer melts, on film thickness -- seeking to understand the universal aspects of this problem. The intellectual merit is to develop new understanding of how polymers diffuse at surfaces and in confined geometries, which is fundamental in many scientific and technical applications, including adhesion, interdiffusion, friction, the mechanical behavior of composite and nanocomposite materials, and functional properties of other kinds, and also to develop new experimental tools to quantify polymer mobility in ultra-thin films that are impossible to characterize by conventional methods. The graduate students will be part of an interdisciplinary research group with other students from chemistry, chemical engineering, physics, and materials science, integrating research and education. NON-TECHNICAL SUMMARYThis research seeks new fundamental understanding of how polymers and plastics move about at surfaces and in confined geometries. One of the most pressing unsolved problems of polymer science, to solve it will open the door to technical applications and technological improvement in areas including adhesion, friction, composite and nanocomposite materials, and functional materials. This research will produce new experimental tools to quantify polymer mobility impossible to characterize by conventional methods. This will improve research infrastructure in the polymer field. This laboratory has an excellent track record regarding diversity, especially in involving women undergraduate and graduate researchers, and integrating research with education. The broader impact of this research involves strong connections with industry, with international collaborators, and the promotion of educational diversity.

本研究的重点是聚合物物理学的一个中心问题？聚合物如何沿固-液界面沿着扩散和在受限的几何形状中扩散。 这将使用新的荧光光谱实验平台进行研究，有时使用单分子分辨率（FCS，荧光相关光谱），有时使用FRAP（光漂白后的荧光恢复），有时使用FRET（Förster共振能量转移），有时使用单粒子成像。 如所实施的，这些实验将产生空间分辨率为0.5 μ m的空间分辨测量。 研究将集中在界面的聚合物侧？聚合物平移扩散对链长、聚合物表面覆盖率的依赖性，以及在受限聚合物熔体的情况下对膜厚度的依赖性--试图理解这个问题的普遍方面。 其智力价值是发展对聚合物如何在表面和受限几何形状中扩散的新理解，这在许多科学和技术应用中是基础，包括粘合，相互扩散，摩擦，复合材料和纳米复合材料的机械行为，以及其他类型的功能特性，并开发新的实验工具来量化超薄膜中的聚合物迁移率，这是不可能通过常规方法表征的。 研究生将与来自化学，化学工程，物理和材料科学的其他学生组成跨学科研究小组，将研究与教育相结合。 非技术总结这项研究寻求对聚合物和塑料如何在表面和受限几何形状中移动的新的基本理解。 聚合物科学最紧迫的未解决的问题之一，解决它将打开技术应用和技术改进的大门，包括粘合，摩擦，复合材料和纳米复合材料以及功能材料。 这项研究将产生新的实验工具，以量化聚合物的流动性不可能通过传统的方法来表征。 这将改善聚合物领域的研究基础设施。 该实验室在多样性方面有着良好的记录，特别是在吸收女本科生和研究生研究人员参与以及将研究与教育相结合方面。 这项研究的更广泛的影响涉及与行业，与国际合作者的紧密联系，以及促进教育多样性。