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

该项目的目的是确定添加的纳米颗粒对纳米复合材料中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，即使在最高填充率下也没有聚集。这使得在没有纳米颗粒聚集干扰影响的情况下，首次对纳米复合材料性能进行定量研究。该项目将特别关注纳米颗粒诱导的聚合物链动力学阻滞及其对纳米复合材料动态力学性能的影响。特别关注的是覆盖在纳米颗粒表面的聚合物层，它介导了纳米颗粒与聚合物基体之间的相互作用，有望在纳米复合材料的结构-性能关系中发挥关键作用。该层的结构，即密度和厚度，可以很好地进行综合控制。期望这些研究能够为相关机制提供一个基本的理解，从而导致经常报道的添加纳米颗粒对纳米复合材料力学性能的高效率。

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.