Fast Dynamics in Polymers

在这个程序中，聚合物系统的动态实验研究在一个广泛的温度范围内，从深在固态到深在液态。 该计划的主要课题是分析不同聚合物中的快速动力学。 这种动力学包括纳米尺度上的合作分子运动。 这种运动是许多较慢过程的必要前兆，并强烈影响材料的宏观性质。 主要的方法是光和中子散射光谱学。 这两种技术的结合给出了详细的信息的快速动力学谱和特殊的运动在分子水平上。 不同的理论方法，从模式耦合理论的非对称双阱势模型，进行了测试和用于分析的实验数据。 新的模型近似，一致地描述在广泛的温度和频率范围内的数据进行了讨论和开发。 该计划是在聚合物动力学领域工作的不同团体（实验，理论和计算机模拟）之间广泛合作的起点。 该计划的结果将带来更好的理解微观图像的快速动力学及其特点，在聚合物系统，并将导致发展一致的理论描述的动力学在固体和液体状态%分子运动是一个关键的许多宏观材料的性能。 这里建议的研究集中在分子频率（GHz-太赫兹范围）和长度（纳米）尺度上的合作分子运动的分析。 研究结果将对高分子动力学、无序材料动力学和生物高分子动力学领域的发展产生重大影响。 从该计划的结果中获得的知识可以用于设计具有所需性能的新塑料，特别是用于高频应用（光通信，计算机，光存储器存储设备）。

In this program the dynamic of polymeric systems is studied experimentally in a broad temperature range, from deep in a solid state up to deep in a liquid state. The main subject of the program is analysis of the fast dynamics in different polymers. This dynamics includes cooperative molecular motion on a nanometer scale. This motion is a necessary precursor of many slower processes and strongly influences macroscopic properties of the material. The main methods are light and neutron scattering spectroscopy. The combination of these two techniques gives detailed information on the fast dynamics spectra and on peculiarities of the motion on a molecular level. Different theoretical approaches, from Mode-Coupling Theory to model of Asymmetric Double-Well Potentials, are tested and used for analysis of the experimental data. New model approximations that would consistently describe the data in a broad temperature and frequency ranges are discussed and developed. The program is a starting point for broad collaboration between different groups (experimental, theory and computer simulations) working in the field of polymer dynamics. The results of the program will bring better understanding of microscopic picture of the fast dynamics and its peculiarities in polymeric systems and will lead to development of consistent theoretical description of the dynamics in solid and liquid states%%%Molecular motion is a key for many macroscopic materials properties. The proposed here research is concentrated on analysis of cooperative molecular motion on a molecular frequency (GHz-THz range) and length (nanometer) scales. The results of the research will strongly influence the development of the field of polymer dynamics and dynamics of disordered materials and bio-polymers in general. The knowledge received I the result of the program can be useful for designing of new plastics with desired properties, especially for high-frequency applications (optical comunications, computers, optical memory storage devices).