Influence of nanoparticles on the polymer chain dynamics in model polymer nanocomposites

该项目的目的是确定纳米复合材料中添加的纳米颗粒对聚合物链动力学的影响。所研究的模型纳米复合材料由聚合物稳定的纳米颗粒组成，即使在最高的填充率下也没有聚集。这使得第一次的纳米复合材料的性能没有干扰的纳米粒子聚集的影响进行定量调查。该项目将特别关注纳米颗粒引起的聚合物链动力学延迟及其对纳米复合材料动态力学性能的影响。特别注意的是，聚合物层覆盖的纳米粒子，介导的纳米粒子和聚合物基体之间的相互作用，预计将发挥关键作用的纳米复合材料的结构-性能关系。该层的结构，即其密度和厚度，可以很好地综合控制。预计这些研究提供了相关机制的基本理解，导致经常报道的添加的纳米颗粒对纳米复合材料的机械性能的高效率。

The aim of the proposed project Is to identify the effect of added nanoparticles on the polymer chain dynamics in nanocomposites. The investigated model nanocomposites consist of polymer-stabilized nanoparticles that show no aggregation even at the highest filling ratios. This allows for the first time a quantitative investigation of nanocomposite properties without the interfering influence of nanoparticle aggregation. The project will in particular focus on nanoparticle-induced retardation of polymer chain dynamics and its effect on the dynamic-mechanical properties of the nanocomposite. Special attention is given to the polymer layer covering the nanoparticles which mediates the interactions between the nanoparticles and the polymer matrix is expected to play a keyrole in the structure-property relation of nanocomposites. The structure of this layer, I.e. its density and thickness, can be well controlled synthetically. It is expected that these studies provide a fundamental understanding of the relevant mechanisms leading to the frequently reported high efficiency of added nanoparticles on the mechanical properties of nanocompsoites.