GOALI: Rheological Investigation of Polymer Melts in Equibiaxial Elongational Flows

ABSTRACTPROPOSAL没有。目标：聚合物熔体非等双轴伸长流动的流变学研究本合作研究由目标计划资助，涉及一个学术机构和两家公司：一家主要仪器制造商（TA仪器）和一家主要聚合物树脂生产商（BPAmoco化学公司）。这项研究的结果将大大加深我们对聚合物熔体流动行为的理解，并对这类重要材料的工程和科学产生直接影响。一种改进的润滑挤压流动技术，该技术已获得美国专利，该项目的主要研究者将进一步开发，以实现熔融聚合物在等双轴拉伸流动中的定量流变学研究。新技术将能够在一系列参数范围内进行恒定应变速率和恒定应力测试，这些参数等于或超过任何现有的设备或技术，用于等双轴拉伸流动流变测量。新技术将用于研究一系列聚乙烯和聚丙烯熔体在恒应变速率应力增长和恒应力蠕变流中的流变行为。考虑的聚合物包括使用传统和茂金属催化剂合成的树脂，允许系统地研究分支结构和分子量分布对流变行为的影响。等双轴拉伸流数据将由剪切和单轴拉伸流数据补充。这些新数据将为分子结构和流动类型的重要性提供以前无法获得的见解，这将有利于聚合物材料开发的几个方面，从合成到塑料制造。学生在这个涉及学术界和工业界的合作项目中获得的独特教育经验和培训大大提高了他们作为未来工程师或教育工作者做出重大贡献的能力。

ABSTRACTPROPOSAL NO.: CTS-0327955PRINCIPAL INVESTIGATORS: DAVID C. VENERUSINSTITUTION: ILLINOIS INST. OF TECH. GOALI: RHEOLOGICAL INVESTIGATION OF POLYMER MELTS UN EQUIBIAXIAL ELONGATIONAL FLOWSThis collaborative study, funded through the GOALI program, involves an academic institution and two companies: a major instrument manufacturer (TA Instruments), and a major producer of polymer resin (BPAmoco Chemical Company). The results of this study will significantly deepen our understanding of polymer melt flow behavior and have a direct impact on both the engineering and science of this important class of materials. A modified lubricated squeezing flow technique, for which a U.S. Patent was issued to the principal investigator of this project, will be further developed to enable a quantitative rheological study of molten polymers in equibiaxial elongational flows. The new technique will be capable of performing constant strain rate and constant stress tests over a range of parameters that equal or exceed those of any currently available device or technique for equibiaxial elongational flow rheological measurements. The new technique will be used to study the rheological behavior of a series of polyethylene and polypropylene melts in constant strain rate stress growth and constant stress creep flows. The polymers considered include resins synthesized using both conventional and metallocene catalysts allowing for a systematic study of branching structure and molecular weight distribution on rheological behavior. The equibiaxial elongational flow data will be complemented by data from shear and uniaxial elongational flows. These new data will provide previously unavailable insight to the importance of molecular structure and flow type that will benefit several aspects of polymer materials development ranging from synthesis to plastics manufacturing. The unique educational experience and training acquired by students in this collaborative project involving academia and industry greatly enhances their ability to make significant contributions as future engineers or educators.