Investigation of In Situ Interfacial Polymer Structure by Surface Sum-Frequency Generation

通过表面和频生成研究原位界面聚合物结构

• 批准号: 9709386
• 负责人: Marie Messmer
• 金额: $ 1.8万
• 依托单位: Lehigh University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-01 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9709386&HistoricalAwards=false
• 关键词: Investigation; Situ; Interfacial; Polymer; Structure

This Research Planning Grant is supported by the Analytical and Surface Chemistry Program. Professor Messmer and her students at Lehigh University will study the structure of polymeric interfaces with the aim to understand how the structure of polymeric chains affects the tribological properties of these surfaces. This work will correlate the orientation of surface chemical bonds and their conformation with properties such as phase transitions and frictional characteristics. In situ sum-frequency generation spectrometry will be used to determine the degree of bond order and structure for these polymeric surfaces because this second order optical method is sensitive only to interfacial regions and not to bulk properties that often dominate signals in surface spectroscopy. The work will begin with model diblock polymers composed of polyolefins and polyethylene oxide films on fused silica surfaces so that C-H stretching, and C-C bending and rocking modes can be quantified as a function of compositional and environmental variables. Results from this work will identify surface properties that strongly influence the frictional character of these interfaces. This work aims to develop a foundation for predicting the surface frictional properties of polymeric materials through the use of a surface sensitive spectroscopic method, in situ sum-frequency spectrometry. Model diblock polymers will be studied initially. Through sensitive measurements of the composition and structure of these polymeric surfaces, small features that greatly control surface friction will be established. This work has broad application in many important technological areas such as lubrication, anti-flocculating agents, and protective coatings.

这项研究计划补助金由分析和表面化学计划支持。 利哈伊大学的Messmer教授和她的学生将研究聚合物界面的结构，目的是了解聚合物链的结构如何影响这些表面的摩擦学特性。 这项工作将表面化学键的方向和它们的构象与相变和摩擦特性等性质相关联。 原位和频发生光谱法将用于确定这些聚合物表面的键序和结构的程度，因为这种二阶光学方法仅对界面区域敏感，而不对通常在表面光谱中占主导地位的信号的本体性质敏感。 这项工作将开始与模型二嵌段聚合物组成的聚烯烃和聚环氧乙烷膜上的熔融石英表面，使C-H拉伸，C-C弯曲和摇摆模式可以量化的组成和环境变量的函数。 这项工作的结果将确定强烈影响这些接口的摩擦特性的表面特性。 本工作的目的是发展一个基础，通过使用表面敏感的光谱方法，在现场和频光谱预测聚合物材料的表面摩擦性能。 模型二嵌段聚合物将进行初步研究。 通过对这些聚合物表面的组成和结构的灵敏测量，将建立大大控制表面摩擦的小特征。 这项工作在许多重要的技术领域，如润滑，抗腐蚀剂和保护涂层中有广泛的应用。