GHz-THz Dynamics and the Glass Transition in Polymers

GHz-THz 动力学和聚合物中的玻璃化转变

• 批准号: 0315388
• 负责人: Alexei Sokolov
• 金额: $ 35.5万
• 依托单位: University of Akron
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0315388&HistoricalAwards=false
• 关键词: GHz; THz; Dynamics; Glass; Transition

Understanding the fundamentals of molecular motions is crucial for understanding many properties of polymers from macro- to nano- scale. Among various aspects of polymer dynamics the dynamics in the GHz-THz frequency range deserves particular attention because of its importance for applications in information and communication technologies and in photonics. The GHz-THz dynamics of polymeric systems in a broad temperature range, from deep in a solid state up to deep in a liquid state, is studied in this program. Three experimental techniques, light and neutron scattering and dielectric relaxation spectroscopy, are employed. This combination provides detailed microscopic information on the fast dynamics and helps to understand its relationship with macroscopic properties of polymers. This program will advance understanding of microscopic mechanisms behind GHz-THz properties of polymeric materials and molecular motions on a nanometer scale. It will create a solid experimental basis for developments of new theoretical approaches. Expected results will have significant implications on polymer science, and in broader aspect on dynamics of complex systems, Materials Science and Physics in general, and also on Biophysics through better understanding of bio-polymers dynamics. The program includes broad collaborations with a few groups in the US and in Europe.%%%Advanced knowledge of the GHz-THz dynamics has significant impact on design and synthesis of materials for current and future communication, information and computation technologies, on developments of materials for photonic applications, and on a progress in some bio-technologies. The proposed program has also significant impact on education of specialists for future technologies through active involvement of graduate and undergraduate students in this research, developments of graduate courses. Advances in the proposed directions will impact various fields of Materials Science, Physics and Biophysics. The proposed program promotes active international cooperation and collaboration with national multi-user facilities at NIST and ANL. ***

了解分子运动的基本面对于了解从宏到纳米尺度的许多特性至关重要。在聚合物动力学的各个方面中，GHz-THz频率范围的动力学值得特别关注，因为它对信息和通信技术和光子学的应用重要性。该程序在该程序中研究了聚合系统的GHz-THZ动力学，从固态到深处的深度范围内。采用了三种实验技术，即光和中子散射以及介电弛豫光谱。这种组合提供了有关快速动态的详细微观信息，并有助于了解其与聚合物的宏观特性的关系。该程序将进一步了解聚合物材料和分子运动的GHz-THZ性质背后的微观机制。它将为新理论方法的发展创造一个可靠的实验基础。预期结果将对聚合物科学以及对复杂系统，材料科学和物理学的动力学以及通过更好地理解生物聚合物动力学的更广泛的影响。该计划包括与美国和欧洲的几个小组的广泛合作。%%％对GHZ-THZ动力学的高级知识对当前和未来的通信，信息和计算技术，光子应用材料的开发以及某些生物技术的进展对设计和材料的材料进行了重大影响。拟议的计划还通过积极参与研究生和本科生的研究，研究生课程的发展，对未来技术的专家教育也有重大影响。拟议方向的进步将影响材料科学，物理和生物物理学的各个领域。拟议的计划促进了与NIST和ANL的国家多用户设施的积极合作与合作。 ***