Phase Separation Kinetics of Polyelectrolyte Solutions

聚电解质溶液的相分离动力学

• 批准号: 0605833
• 负责人: Murugappan Muthukumar
• 金额: --
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-07-01 至 2011-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0605833&HistoricalAwards=false
• 关键词: Phase; Separation; Kinetics; Polyelectrolyte; Solutions

Thermodynamic stability of aqueous solutions of charged macromolecules is of central importance in all forms of life. Polyelectrolyte solutions in water exhibit complex behavior and present many intellectual challenges. We propose to perform experiments using light scattering and neutron scattering, and to carry out complementary theoretical calculations, pertinent to a fundamental understanding of the kinetics of phase separation in polyelectrolyte solutions. The specific experimental system of the proposed research is aqueous solutions of sodium polystyrene sulfonate containing known amounts of barium chloride. Our ongoing research on this subject points towards a breakthrough in our fundamental understanding of how charged macromolecules undergo phase separation. Clustering of similarly charged polymer chains is found to play an intermediary role during the primordial stages of the nucleation of the new stable phase, based on the limited preliminary data. The pro-posed research will establish the validity and general applicability of this newly discovered phenomenon.%%%The proposed research will have impact in medical research on disease control and a number of key industries including food, cosmetics, personal care products, and pharma-ceuticals. Furthermore, polyelectrolytes are emerging to be the most important, but least understood, materials. Training of graduate students in this important research area is the strong educational component of the proposed activity.

带电大分子水溶液的热力学稳定性对所有生命形式都至关重要。聚电解质水溶液表现出复杂的行为，并提出了许多智力挑战。我们建议使用光散射和中子散射进行实验，并进行补充的理论计算，有关的基本理解的动力学相分离在pH1.5解决方案。具体的实验系统的拟议研究是聚苯乙烯磺酸钠的水溶液中含有已知量的氯化钡。我们正在进行的关于这个主题的研究指出了我们对带电大分子如何进行相分离的基本理解的突破。根据有限的初步数据，发现相似电荷的聚合物链的聚类在新稳定相的成核的原始阶段期间发挥中介作用。拟议的研究将确立这一新发现现象的有效性和普遍适用性。%拟议的研究将对疾病控制的医学研究和一些关键行业产生影响，包括食品，化妆品，个人护理产品和制药。此外，聚电解质正在成为最重要但了解最少的材料。在这一重要研究领域培养研究生是拟议活动的重要教育组成部分。