Dynamic Behavior of Complex Solutions Containing Semiflexible Polymers

含有半柔性聚合物的复杂溶液的动态行为

• 批准号: 8914604
• 负责人: Paul Russo
• 金额: $ 19.8万
• 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: 1990
• 资助国家: 美国
• 起止时间: 1990-02-15 至 1993-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8914604&HistoricalAwards=false
• 关键词: Dynamic; Behavior; Complex; Solutions; Containing

This research focuses on dynamical aspects of rod-bearing polymer solutions. Tracer self-diffusivities of fluorescently tagged rodlike polymers will be measured by fluorescence photobleaching recovery to verify the large data set already obtained via light-scattering methods, and to test existing theories of self diffusion and its relationship to mutual diffusion. Solvent mobility in such solutions will be measured by pulsed-field-gradient nuclear magnetic resonance techniques, in order to account for the increasing resistance offered by solvent as polymer concentration is increased. This will, enable a comparison with theoretical predictions made by Doi and Edwards a decade ago, as well as more recent developments. The diffusion of rigid asymmetric probes through solutions of less stiff polymers will be measured. Finally, an initiative into the behavior of rods with long, flexible sidechains-"furry rods"-is planned. These experiments will open research into the molecular dynamics of rods in the molten state, which relates to the processing of thermotropic liquid crystals.

本研究的重点是动力学方面的杆轴承 聚合物溶液。 荧光染料的示踪剂自扩散系数 标记的棒状聚合物将通过荧光测量 光漂白恢复，以验证大数据集已经 通过光散射方法获得，并测试现有的 自扩散理论及其相互关系 扩散 将测量此类溶液中的溶剂迁移率 通过脉冲场梯度核磁共振技术， 为了解释 溶剂作为聚合物的浓度增加。 这将使 与土井和爱德华兹的理论预测的比较 十年前，以及最近的发展。 扩散 刚性不对称探头的解决方案， 将测量聚合物。 最后，一项倡议， 具有长的柔性侧链的杆-“毛茸茸的杆”-的行为是 计划好了 这些实验将开启对 动力学棒在熔融状态，这涉及到 热致液晶的加工。