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.

该奖项将支持弗吉尼亚理工学院与州立大学的唐纳德·贝尔德（Donald G. Baird）教授与那不勒斯大学的朱塞佩·马鲁奇教授之间的研究合作。研究人员计划评估现有的分子理论来描述液晶聚合物（LCP）的流动行为，并在必要时开发替代方法。更具体地说，研究人员计划：（1）评估和检验DOI首先提出的理论，将理论预测与溶疗和热质系统的实验结果进行比较；（2）进行同时进行流变学实验和结构测量，以发展压力（变形）和流体结构之间的关系；（3）确定开发反映LCP中发现结构的构成理论的可能方向。对表现出液晶质量的高芳族多酰胺和聚酰胺具有很大的兴趣。高模纤维纤维和膜，在某些情况下可以用这些聚合物产生注射零件。在这些聚合物的加工过程中，在流动至柔性链聚合物中未发现的程度上产生结构和方向。因此，为了设计液晶聚合物的过程，有必要建立应力和流动产生的结构之间的关系。通过将美国方面的实验专业知识结合在一起，将LCP的流变学与那不勒斯大学小组的理论优势相结合，研究人员应该能够更深入地深入了解LCP的变形与结构之间的关系。