Engineering Research Equipment Grant: Purchase of a low Stress Rheometer

工程研究设备补助金：购买低应力流变仪

• 批准号: 9008425
• 负责人: Donald Baird
• 金额: $ 5万
• 依托单位: Virginia Polytechnic Institute and State 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: 1990-08-15 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9008425&HistoricalAwards=false
• 关键词: Engineering; Research; Equipment; Grant; Purchase

It is proposed to purchase a rheometer capable of making steady, transient, and dynamic rheological measurements of polymer solutions. This equipment would support research in liquid crystals, polyelectrolytes, characterization of novel polymers, aggregation phenomena in nitrocellulose and hydrozpropyl lignins, and ionomers used as elastomers. These materials have complex rheological behavior including shear rate- and time-dependent viscosity and elasticity. In order to characterize these microstructures in their unpreturbed state, it is essential to make rheological measurements at very low stress levels. These materials such low viscosities and storage and loss moduli that extremely sensitive torque transducers are needed. Rheological measurements with the proposed equipment serve two purposes. First, one can relate a polymer's microstructure to specific rheological properties, providing guidance on how to alter the molecular structure of a polymer to obtain a desired property. Secondly, one can determine the optimum processing conditions for obtaining desired properties.

提议购买能够对聚合物溶液进行稳定，瞬态和动态流变学测量的结变仪。 该设备将支持液晶，聚电解质，新型聚合物的表征，硝酸纤维素和氢二丙基木质素的聚集现象以及用作弹性体的离子体。 这些材料具有复杂的流变行为，包括剪切速率和时间依赖性的粘度和弹性。 为了在其无扰动状态下表征这些微观结构，必须以非常低的应力水平进行流变学测量。 这些材料如此低的粘度和存储和损耗模量，需要极灵敏的扭矩传感器。 拟议设备的流变测量可实现两个目的。 首先，可以将聚合物的微观结构与特定的流变特性联系起来，从而提供有关如何改变聚合物的分子结构以获得所需特性的指导。 其次，可以确定获得所需属性的最佳处理条件。