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U.S.-Italy Cooperative Research: Rheology of Liquid Crystalline Polymers

美意合作研究：液晶聚合物流变学

基本信息

批准号：
8814033
负责人：
Donald Baird
金额：
$ 0.65万
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：
1988
资助国家：
美国
起止时间：
1988-12-01 至 1991-11-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8814033&HistoricalAwards=false
关键词：
U.S.Italy Cooperative Research Rheology

项目摘要

This U.S.-Italy award will support a research collaboration between Professor Donald G. Baird of the Virginia Polytechnic Institute and State University and Professor Giuseppe Marrucci of the University of Naples. The investigators plan to evaluate an existing molecular theory for describing the flow behavior of liquid crystalline polymers (LCP's) and to develop an alternative approach, if necessary. More specifically, the investigators plan to: (1) evaluate and test a theory first proposed by Doi, comparing theoretical predictions with experimental results for both lyotropic and thermo-tropic systems; (2) carry out simultaneous rheological experiments and structural measurements in order to develop relations between stress (deformation) and fluid structure; and (3) determine possible directions for developing constitutive theories reflecting the structure found in LCP's. There is considerable interest in the high aromatic polyestesters and polyamides that exhibit liquid crystalline order. High modulus fibers and films, and in some cases injection-molded parts, can be produced with these polymers. During the processing of these polymers, structure and orientation are generated during flow to a degree not found in flexible chain polymers. Consequently, in order to design processes for liquid crystalline polymers, it is necessary to establish the relation between stress and flow generated structure. By combining the experimental expertise of the U.S. side in understanding the rheology of LCP's with the theoretical strengths of the University of Naples group, the researchers should be able to provide deeper insights into the relation between deformation and structure for LCP's.

这项美国-意大利奖将支持弗吉尼亚理工学院和国立大学的Donald G.Baird教授与那不勒斯大学的Giuseppe Marrucci教授之间的研究合作。研究人员计划评估现有的描述液晶聚合物(LCP)流动行为的分子理论，并在必要时开发另一种方法。更具体地说，研究人员计划：(1)评估和检验由Doi首次提出的理论，将理论预测与实验结果进行比较，用于溶致和热致体系；(2)同时进行流变学实验和结构测量，以建立应力(变形)和流体结构之间的关系；以及(3)确定反映液晶结构的本构理论的可能发展方向。人们对具有液晶有序的高芳香族聚酯酸酯和聚酰胺有相当大的兴趣。用这些聚合物可以生产高模数纤维和薄膜，在某些情况下还可以生产注塑零件。在这些聚合物的加工过程中，在流动过程中会产生结构和取向，这种程度是柔性链聚合物所没有的。因此，为了设计液晶聚合物的工艺，有必要建立应力与流动产生的结构之间的关系。通过将美方在理解LCP流变学方面的实验专业知识与那不勒斯大学研究小组的理论优势相结合，研究人员应该能够为LCP的变形和结构之间的关系提供更深层次的见解。