Dynamics, Microviscosity, and Length Scales in Aqueous Polymer Solutions

聚合物水溶液中的动力学、微粘度和长度尺度

• 批准号: 0239390
• 负责人: Edward Castner
• 金额: $ 38.25万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-01-01 至 2005-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0239390&HistoricalAwards=false
• 关键词: Dynamics; Microviscosity; Length; Scales; Aqueous

In this project funded by the Experimental Physical Chemistry Program of the Chemistry Division, Castner will investigate friction in polymer and polymer-based complex fluids experimentally using time-dependent optical techniques. In these experiments a simple hypothesis relating the microviscosity of a polymer solution to the microviscosity of the monomer will be tested, and related behavior in triblock co-polymers will be explored. Optical-heterodyne detected Raman-induced Kerr effect spectroscopy will be used to measure the microviscosities. Recent advances in femtosecond spectroscopic techniques will help improve the measurements. The widely variable shear viscosity of these triblock co-polymer gels system will allow incisive tests of the microviscosity hypothesis. A second set of experiments will explore dynamics in thermoreversible hydrophilic polymer gels.Results of these experiments will lead to better understanding of aqueous polymer solutions and are of relevance to the design of improved polymer gels for drug delivery and other applications. This research will be be conducted in collaboration with theorist Robert Cave of Harvey Mudd College, an undergraduate institution. The PI also mentors first-year women students from Douglass College in an Introduction to Scientific Research course. As a result, undergraduates from Rutgers University, Douglass College, and Harvey Mudd College can obtain experience in this forefront research area.

在这个由化学部实验物理化学计划资助的项目中，Castner将使用随时间变化的光学技术实验性地研究聚合物和基于聚合物的复杂流体中的摩擦。 在这些实验中，将测试一个简单的假设，即聚合物溶液的微粘度与单体的微粘度之间的关系，并探讨三嵌段共聚物的相关行为。 光外差探测拉曼诱导克尔效应光谱将用于测量微粘度。 飞秒光谱技术的最新进展将有助于改善测量。 这些三嵌段共聚物凝胶体系的广泛变化的剪切粘度将允许对微粘度假设进行深入的测试。 第二组实验将探索热可逆亲水性聚合物凝胶的动力学，这些实验的结果将导致更好地理解聚合物水溶液，并与药物输送和其他应用的改进聚合物凝胶的设计有关。 这项研究将与哈维穆德学院（Harvey Mudd College）的理论家罗伯特·凯夫（Robert Cave）合作进行。 PI还指导道格拉斯学院一年级女学生学习科学研究入门课程。 因此，罗格斯大学、道格拉斯学院和哈维穆德学院的本科生可以获得这一前沿研究领域的经验。