Presidential Young Investigator Award

总统青年研究员奖

• 批准号: 8957386
• 负责人: Frank Bates
• 金额: $ 31.2万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-07-01 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8957386&HistoricalAwards=false
• 关键词: Presidential; Young; Investigator; Award

This Presidential Young Investigator research program will be developed along three lines: investigation of the thermodynamics of polymer mixing, evaluation of the dynamics of polymer-polymer phase separation and block copolymer ordering, and establishment of a synthesis and characterization facility for the development of model materials. In the area of thermodynamics two classes of mixtures are of principal interest: binary polymer mixtures and block copolymers. Research efforts will be directed at advancing our understanding of polymer segment interactions using model systems, and at correlating this knowledge with experimentally determined excess thermodynamics properties, phase diagrams, and interfacial phenomena. Such information will be obtained using neutron, x-ray and light scattering methods, along with electron and optical microscopy techniques. Two projects will be initiated in the dynamics category: spinodal decomposition, and nucleation and growth of binary polymer mixtures, and rheological characterization of order and disorder in block copolymers. These investigations take advantage of our thermodynamic results in developing the appropriate phase diagrams with which to explore issues relating to the dynamics of phase separation, and the properties of the resulting materials. Isotopic polymer mixtures represent one example of an ideal model system which we will be using in study -ing spinodal decomposition by light and neutron scattering. Investigation of block copolymers dynamics will rely mainly on the combined use of a mechanical spectrometer and small-angle x- ray and neutron scattering. Achieving these thermodynamics and dynamics goals depend upon the ability to manipulate the molecular weight, microstructure, isotopic constitution, and chain architecture of model polymers. This requirement will be met through the development of an anionic polymerization facility, augmented by a catalytic hydrogenation and molecular characterization capability. Thus, information regarding polymer thermodynamics and dynamics can be applied directly to materials optimization.

这项总统青年研究计划将 沿着三条路线发展： 聚合物混合的热力学， 聚合物-聚合物相分离和嵌段共聚物有序化， 以及建立一个合成和特性鉴定设施 用于模型材料的开发。 在热力学领域，有两类混合物， 主要兴趣：二元聚合物混合物和嵌段 共聚物。 研究工作将致力于推进我们的 利用模型理解聚合物链段相互作用 系统，并将这些知识与实验 确定的过剩热力学性质，相图， 界面现象 这些信息将通过使用 中子、X射线和光散射法，沿着电子 和光学显微镜技术。 将在动力学类别中启动两个项目： 亚稳分解以及二元化合物的成核和生长 聚合物混合物，和流变特性的秩序和 嵌段共聚物中的无序。 这些调查需要 我们的热力学结果的优势，在发展 适当的相图，以探讨有关问题 到相分离的动力学以及相分离的性质 所得材料。 同位素聚合物混合物代表一种 一个理想的模型系统的例子，我们将使用在研究 - 通过光和中子散射进行旋节线分解。 嵌段共聚物动力学的研究将主要依赖于 机械光谱仪和小角度x-射线的结合使用 射线和中子散射。 实现这些热力学和动力学目标取决于 根据操纵分子量的能力， 微结构、同位素组成和链结构 模型聚合物。 这一要求将通过 阴离子聚合设施的开发，通过 催化加氢及分子表征 能力。 因此，关于聚合物热力学的信息 动力学可以直接应用于材料优化。