Engineering Research Equipment Grant: Purchase of a low Stress Rheometer

建议购买一台流变仪， 稳态、瞬态和动态流变测量 聚合物溶液。 这些设备将支持研究 在液晶、聚电解质、 新型聚合物、硝酸纤维素中的聚集现象以及 羟丙基木质素和用作弹性体的离聚物。 这些材料具有复杂的流变行为， 剪切速率和时间依赖性粘度和弹性。 为了表征这些微结构， 在未预扰动的状态下，必须使流变性 在非常低的应力水平下进行测量。 这些材料 这种低粘度和储存及损耗模量 需要极其灵敏的扭矩传感器。 流变测量与建议的设备服务 两个目的。 首先，可以将聚合物的 微观结构到特定的流变性能， 提供如何改变分子结构的指导 以获得所需的性能。 其次，一 可以确定最佳的加工条件， 获得所需的性能。

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.