Dynamics of Rodlike Polymers in Complex Media

复杂介质中棒状聚合物的动力学

• 批准号: 9634713
• 负责人: Paul Russo
• 金额: $ 30.83万
• 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: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2000-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9634713&HistoricalAwards=false
• 关键词: Dynamics; Rodlike; Polymers; Complex; Media

9634713 Russo Entanglement of rodlike polymers will be investigated by diffusion measurements on model rods in binary solutions, liquid crystals, ternary mixtures with other polymers, and dispersions in permanent, inflexible gels. The methods to be employed include dynamic light scattering, fluorescence photobleaching recovery and analytical ultracentrifugation. These studies will illuminate the effects of molecular shape on entanglement, which is an important determinant of the processibility of rodlike polymers. By comparison to an extensive literature on entanglement in random flight polymers, the effects of molecular rigidity can be realized. This proposed work also bears on the nature of molecular composite precursor solutions and on anisotropic diffusion in polymer liquid crystals, while illuminating how matrix topography governs diffusion. %%% This grant falls in the area of molecular-level understanding of polymer molecules in various processing environments, such as solutions, blends, gels, etc., with emphasis on rigid-rod molecules such as liquid crystals. ***

棒状聚合物的缠结将通过在二元溶液、液晶、与其他聚合物的三元混合物和永久的、不灵活的凝胶分散体中的模型棒上的扩散测量来研究。采用的方法包括动态光散射法、荧光光漂白法和分析超离心法。这些研究将阐明分子形状对纠缠的影响，这是棒状聚合物可加工性的重要决定因素。通过与大量关于随机飞行聚合物缠结的文献进行比较，可以认识到分子刚性的影响。这项工作还涉及到分子复合前体溶液的性质和聚合物液晶中的各向异性扩散，同时阐明了基质形貌如何控制扩散。该资助落在对各种加工环境（如溶液、混合物、凝胶等）中的聚合物分子的分子水平理解领域，重点是液晶等刚性棒分子。＊＊＊