Dynamic Aspects of Rodlike Polymer Solutions and Gels

棒状聚合物溶液和凝胶的动态方面

• 批准号: 9221585
• 负责人: Paul Russo
• 金额: $ 28.88万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-05-01 至 1996-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9221585&HistoricalAwards=false
• 关键词: Dynamic; Aspects; Rodlike; Polymer; Solutions

Rodlike polymers are the basic components of various high -- temperature, high -- strength materials. Conventional processing methods are often inadequate for rods, so they must be processed from concentrated solutions -- most often into fibers and films. However, the solution behavior or rodlike polymers remains poorly studied compared to random coil polymers. Additionally, it is important to understand the dynamics of mixtures of rodlike and random coil polymers, as these mixtures are the precursors to composite materials in which rodlike polymers reinforce a conventional random coil matrix. Optical studies of the diffusion of helical polypeptides have already revealed much about concentrated, isotropic solutions. These studies will be extended to mixtures with random coils and also to liquid crystalline solutions. A special class of polypeptide, the poly(alkylglutamate)s, will facilitate these studies. Thermoreversible gelation of rodlike polymers is a baffling phenomenon, but an important one if rodlike polymers are to be developed into three -- dimensional materials and not just fibers and films. Poly(alkylglutamate)s and other polypeptides will be used to study the gelation of rodlike polymers. Light scattering and tracer diffusion measurements will help to establish the relative importance of aggregation and phase separation in gelation.

棒状聚合物是各种高分子材料的基本组成部分， 高温、高强度材料。 常规处理 方法通常不适用于棒，因此必须对棒进行处理， 从浓缩溶液--最常见的是变成纤维和薄膜。 然而，棒状聚合物的溶液行为仍然很差 与无规卷曲聚合物相比。 此外，还 重要的是要了解混合物的棒状和 无规卷曲聚合物，因为这些混合物是 复合材料，其中棒状聚合物增强 常规无规卷曲矩阵。 扩散的光学研究 已经揭示了很多关于 浓缩的各向同性溶液。 这些研究将被延长 涉及具有无规卷曲的混合物， 解决方案 一类特殊的多肽， 聚（烷基谷氨酸盐）将促进这些研究。 棒状聚合物的热可逆凝胶化是一个令人困惑的问题， 现象，但一个重要的，如果棒状聚合物是 发展成三维材料而不仅仅是纤维 和电影。 聚（烷基谷氨酸盐）和其它多肽将是优选的。 用于研究棒状聚合物的凝胶化。 光散射 和示踪剂扩散测量将有助于建立 聚集和相分离的相对重要性 凝胶化