Influence of Polymer-Solid Contacts on Chain Order and Dynamics Probed by Advanced NMR Spectroscopy

通过先进核磁共振波谱探测聚合物-固体接触对链序和动力学的影响

• 批准号: 67458822
• 负责人: Professor Dr. Hans Wolfgang Spiess
• 金额: --
• 依托单位: Max-Planck-Institut für Polymerforschung
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/67458822?language=en
• 关键词: Influence; Polymer; Solid; Contacts; Chain

Advanced solid state NMR provides unique information about the conformation, chain order and dynamics of polymers in bulk, at the interface to solids and in the interphase in nanocomposites. Recent developments such as 1H-1H- or 1H-13C- double quantum NMR together with studies of 13C chemical shift anisotropy, 2H quadrupole coupling, or the Nuclear Overhauser Effect (NOE) offer ample opportunities to investigate extended chain conformations and their dynamics in systems with high selectivity, which are also studied in other projects of the Priority Programme. The spatial extension of the altered polymer behaviour will be probed by NMR spin diffusion. The focus will be on poly(butadiene) poly(n-alkylmethacrylates), poly(n-alkylacrylates), and poly(styrene), which have recently been shown to exhibit different tendencies to form extended chain conformations and nanostructures in bulk. In mixtures with sub-micron particles of inorganic oxides such as SiO2 or TiO2 we will study how the local structure and dynamics is influenced by the presence of the surface and how this changes the properties of the composites. In order to maximize the interface, the solids will be introduced as nanoparticles, with and without decoration by short chains of the polymers themselves. The NMR studies will performed in collaborations within the Priority Programme studying the same systems by X-ray scattering, optical spectroscopy, dielectric and mechanical relaxation and last, but not least computer simulation.

先进的固态NMR提供了关于聚合物在本体、固体界面和纳米复合材料界面中的构象、链序和动力学的独特信息。最近的发展，如1H-1H-或1H-13 C-双量子NMR以及13 C化学位移各向异性、2 H四极耦合或核奥弗豪泽效应（NOE）的研究，为研究高选择性系统中的延伸链构象及其动力学提供了充足的机会，优先计划的其他项目也对这些进行了研究。改变的聚合物行为的空间延伸将通过NMR自旋扩散来探测。重点将是聚（丁二烯）聚（N-烷基甲基丙烯酸酯），聚（N-烷基丙烯酸酯），和聚（苯乙烯），最近已被证明表现出不同的倾向，形成扩展链构象和纳米结构的散装。在与无机氧化物（如SiO2或TiO 2）的亚微米颗粒的混合物中，我们将研究表面的存在如何影响局部结构和动力学，以及这如何改变复合材料的性能。为了使界面最大化，固体将作为纳米颗粒引入，具有或不具有聚合物本身的短链装饰。核磁共振研究将在优先计划内合作进行，通过X射线散射，光谱学，介电和机械弛豫以及最后但并非最不重要的计算机模拟研究相同的系统。

项目成果

Chemical Mapping of Silica Prepared via Sol-Gel Reaction in Rubber Nanocomposites

• DOI: 10.1021/ma5020929
• 发表时间: 2015-01
• 期刊: Macromolecules
• 影响因子: 5.5
• 作者: E. Miloskovska;Cornelius Friedrichs;D. Hristova-Bogaerds;Olivier Persenair;M. Duin;M. Hansen

Solid-State NMR of Polymers

聚合物的固态核磁共振

• DOI: 10.1016/b978-0-444-53349-4.00025-x
• 发表时间: 2012
• 作者: K. Saalwächter;H. W. Spiess
• 通讯作者: H. W. Spiess

Glass transition of poly(ethylmethacrylate) admixed and bound to nanoparticles.

混合并结合到纳米颗粒上的聚（甲基丙烯酸乙酯）的玻璃化转变

• DOI: 10.1063/1.4769252
• 发表时间: 2013
• 期刊: The Journal of chemical physics
• 作者: C. Friedrichs;S. Emmerling;G. Kircher;R. Graf;H. W. Spiess
• 通讯作者: H. W. Spiess