US-Czechoslovakia Research: Identification and Utilization of Critical Conditions for Polymer Characterizations

美国-捷克斯洛伐克研究：聚合物表征关键条件的识别和利用

• 批准号: 9208552
• 负责人: David Hunkeler
• 金额: $ 3.23万
• 依托单位: Vanderbilt University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-12-15 至 1996-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9208552&HistoricalAwards=false
• 关键词: US; Czechoslovakia; Research; Identification; Utilization

This U.S.-Czechoslovakia research project in chemistry is between Dr. David Hunkeler of Vanderbilt University and Dr. Dusan Berek of the Polymer Institute, Slovak Academy of Science. The researchers will use the concept of chromotographic invisibility to identify critical conditions where the retention volume of a polymer in a mixed element is independent of molecular weight. They will compare two approaches for generating critical conditions: (1) Belenki's method where the elution strength of the binary mixture is varied to control the adsorption and exclusion of the macromolecules and (2) the Hunkeler-Macko-Berek technique where the thermodynamic quality of the mobile phase is varied to balance the free energy of adsorption and precipitation with that of redissolution and exclusion. The influence of temperature, pressure and sample concentration on the behavior of selected polymers at their critical conditions will also be evaluated. The critical conditions will be correlated with properties which characterize the macromolecule in solution. The identified critical conditions will then be applied to the separation and identification of polymer blends and block and graft copolymers according to their molecular weight and composition. This project in polymer research fulfills the program objective of advancing scientific knowledge by enabling leading experts in the United States and Eastern Europe to combine complementary talents and pool resources in areas of strong mutual interest and competence.

这个美国-捷克斯洛伐克化学研究项目是 范德比尔特大学的大卫·亨克尔博士和 斯洛伐克科学院聚合物研究所的Dusan Berek博士 科学。 研究人员将使用 彩色隐形识别关键 聚合物在聚合物溶液中的保留体积 混合元素与分子量无关。 他们 我将比较两种方法， 条件：（1）Belenki方法，其中洗脱 改变二元混合物的强度以控制 吸附和排斥的大分子和（2） Hunkeler-Macko-Berek技术，其中热力学 改变移动的相的质量 吸附能和沉淀能 再溶解和排斥。 的影响 温度、压力和样品浓度 选定聚合物在临界条件下的行为 也将进行评估。 临界条件将是 与表征 溶液中的大分子。 确定的关键 然后将条件应用于分离， 聚合物共混物及嵌段和接枝物鉴定 根据其分子量的共聚物， 混合物. 本项目在聚合物的研究实现了计划 促进科学知识的目标， 美国和东欧的主要专家， 联合收割机互补人才，集中资源 有着强烈的共同利益和能力。