Research Initiation Award: Molecular-Level Engineering of Polymer Interfaces in Colloidal Suspensions

研究启动奖：胶体悬浮液中聚合物界面的分子级工程

• 批准号: 9009754
• 负责人: Harry Ploehn
• 金额: $ 7万
• 依托单位: Texas A&M University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-01 至 1993-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9009754&HistoricalAwards=false
• 关键词: Research; Initiation; Award; Molecular; Level

The goal of this research is to explore the microstructural details and macroscopic consequences of polymer grafted colloidal particles in aqueous media. Novel grafting techniques utilizing biochemical linking agents will be used to graft poly(ethylene oxide) or other polymers onto functionalized polystyrene or silica particles. The efficacy of the analytical techniques, including UV absorbance, NMR spectroscopy, static and dynamic light scattering, and dielectric spectroscopy. Rheological measurements, including capillary viscometry, steady shear and constant stress viscometry, oscillation, and stress relaxation, yield insights regarding polymer-mediated interparticle forces and the suspension microstructure. The dielectric spectroscopy technique will be extended to concentrated suspensions containing grafted polymer. These measurements will be combined with extended theoretical models of polymer layer structure, interparticle forces, and suspension rheology in order to rationalize the observed equilibrium properties and dynamic behavior.

本研究的目的是探索微结构 聚合物接枝的细节和宏观结果 水介质中的胶体颗粒。 新型嫁接 将使用利用生物化学连接剂的技术 将聚（环氧乙烷）或其它聚合物接枝到 官能化聚苯乙烯或二氧化硅颗粒。 疗效 分析技术，包括UV吸光度、NMR 光谱学、静态和动态光散射，以及 介电谱 流变测量，包括 毛细管粘度、定常剪切和恒应力 粘度、振荡和应力松弛， 关于聚合物介导的颗粒间力和 悬浮微结构 介电谱 技术将扩展到浓悬浮液 含有接枝聚合物。 这些测量将是 结合聚合物层的扩展理论模型 结构、颗粒间力和悬浮液流变学 为了使观察到的平衡性质合理化， 动态行为