Specific Interactions In Polymer Systems

聚合物系统中的特定相互作用

• 批准号: 0901180
• 负责人: Paul Painter
• 金额: $ 39.9万
• 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: 2009
• 资助国家: 美国
• 起止时间: 2009-06-01 至 2013-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0901180&HistoricalAwards=false
• 关键词: Specific; Interactions; Polymer; Systems

TECHNICAL SUMMARYThis research involves studies of specific interactions in polymer systems. One part of the proposed work seeks to obtain a fundamental understanding of the interplay between microstructure and the fraction of same chain contacts, or self-concentration, in hydrogen bonded polymer blends. Measurements of the fraction of hydrogen-bonded groups in these mixtures will also be used to determine the effect of hydrogen bonding on rheological properties. This work will be complemented by the second part of the proposed research, which involves studies of the shapes and widths of bands in these strongly interacting systems and how these are affected by interactions and relaxation processes. Infrared bands and Raman lines are sensitive to local environment and picosecond scale dynamics. The extent to which useful information can be obtained from the spectra of polymers will be evaluated by comparing the results of band shape analysis to those obtained by applying ultrafast two-dimensional infrared spectroscopic (2D-IR) techniques. NON-TECHNICAL SUMMARYThe factors that govern both the mixing of polymer materials and so-called relaxation phenomena (which govern their mechanical and rheological behavior) is of considerable practical importance. Finding polymers that mix at the molecular level (most do not) can lead to materials with novel properties. Even polymers that phase-separate can have important properties, such as enhanced impact resistance, providing that the size of the phase separated domains are controlled. This research will use infrared spectroscopy to study both specific interactions and relaxation behavior in polymers and their mixtures. The work will also contribute to education through the mechanism of involving both undergraduate and graduate students in laboratory work, thus teaching them the fundamentals of spectroscopic and other techniques. More uniquely, work supported on previous NSF awards that resulted in CD based monographs, complete with animations and interactive programs, will be extended to produce sets of lectures that will be freely accessible over the web.

本研究涉及聚合物体系中特定相互作用的研究。所提出的工作的一部分，旨在获得一个基本的理解微观结构和相同的链接触，或自我集中，在氢键聚合物共混物的分数之间的相互作用。在这些混合物中的氢键基团的分数的测量也将用于确定氢键对流变性能的影响。这项工作将得到拟议研究的第二部分的补充，该部分涉及研究这些强相互作用系统中的带的形状和宽度，以及它们如何受到相互作用和弛豫过程的影响。红外波段和拉曼谱线对局部环境和皮秒尺度动力学敏感。在何种程度上可以从聚合物的光谱中获得有用的信息将通过比较的结果，通过应用超快二维红外光谱（2D-IR）技术得到的带形分析进行评估。 控制聚合物材料的混合和所谓的松弛现象（控制它们的机械和流变行为）的因素具有相当大的实际重要性。发现在分子水平上混合的聚合物（大多数不混合）可以产生具有新特性的材料。即使是相分离的聚合物也可以具有重要的性能，例如增强的抗冲击性，只要相分离区域的尺寸得到控制。这项研究将使用红外光谱来研究聚合物及其混合物中的特定相互作用和弛豫行为。这项工作还将通过让本科生和研究生参与实验室工作的机制来促进教育，从而教授他们光谱和其他技术的基础知识。更独特的是，以前的NSF奖项支持的工作，导致基于CD的专著，完成动画和互动程序，将被扩展到制作讲座集，将在网络上免费访问。