Acquisition of a Rheometer and Materials Processing Equipment

小行星9305286 流变仪是测量材料粘弹性的最常用和最可靠的技术。 这款流变仪是一款流变固体分析仪，它可以容纳熔融聚合物、玻璃状薄膜、纤维、浓缩溶液、橡胶和复合材料，满足了校园内许多研究人员的样品配置要求。 加工设备包括用于组合各种组分的熔融混合器和小型挤出机，以形成用于随后的结构和机械评价的样品。 在整个工程与应用科学学院和艺术与科学学院，这种新设备将补充宾夕法尼亚大学教师目前使用的实验技术。 在我们的研究实验室中，我们通过使用挥发性溶剂制备共聚物/均聚物共混物，这是工业上避免的做法，并使用透射电子显微镜和小角X射线散射评估形态和相行为。 与拟议的设备，共混物将制备不使用溶剂和我们广泛的形态学研究将涉及到新的流变学研究。 在另一个例子中，目前在宾夕法尼亚大学通过使用合成技术元素和热分析以及广角X射线散射来研究预陶瓷聚合物。 新设备将提供一种使用挤出机制造纤维的方法，并使用流变仪研究陶瓷聚合物预制体的机械性能。 其他研究项目包括：将导电聚合物的结晶度百分比和导电性与材料的粘弹性相关联，比较通过扩散和零剪切粘度测量的聚合物共混物中的分子运动，并通过中子散射和流变学测试离聚物溶液的理论模型。 该项目的一个重要目标是通过使用类似的加工技术和更加强调微观结构和宏观性质的相互依赖性，使宾夕法尼亚大学的研究与工业问题更加相关。 ***

9305286 Winey Rheometry is the most common and reliable technique for measuring viscoelastic properties of materials. This rheometer, a Rheometrics Solids Analyzer, satisfies the sample configuration requirements of many researchers on campus, in that it can accommodate molten polymers, glassy thin films, fibers, concentrated solutions, rubber, and composites. The processing equipment, includes a melt mixer for combining a variety of components and a small extruder to form samples for subsequent structural and mechanical evaluation. Throughout the School of Engineering and Applied Science and the School of Arts and Sciences, this new equipment will compliment the experimental techniques currently used by Penn faculty. In our research laboratories we prepare copolymer/homopolymer blends by using a volatile solvent, a practice which is avoided by industry, and evaluate the morphology and phase behavior using transmission electron microscopy and small angle x-ray scattering. With the proposed equipment, blends will be prepared without using a solvent and our extensive morphological studies will be related to new rheological studies. In another example, preceramic polymers are currently studied at Penn by using synthetic techniques elemental and thermal analysis, and wide angle x-ray scattering. The new equipment will provide a means of fabricating fibers, using the extruder, and studying the mechanical properties of the preceramic polymers, using the rheometer. Other research projects include: relating the percent crystallinity and conductivity of a conducting polymer with the viscoelastic properties of the materials, comparing the molecular motion in polymer blends as measured by both diffusion and zero shear viscosity, and testing theoretical models of ionomer solutions by neutron scattering and rheology. An important goal of this project is to make the research at Penn more relevant to industrial concerns by using similar processing techniques and g iving more emphasis to the interdependence of microscopic structure and macroscopic properties. ***