Rheology of nanoparticulate epoxy suspensions

纤维增强纳米复合材料中颗粒的分散特性，如一次和二次粒径、粒径分布、聚集态结构、颗粒形貌和表面功能化等，对纤维增强纳米复合材料的加工和应用有着重要的影响。到目前为止，只有模糊的模型存在这些相互依存关系的描述。需要回答的基本问题是分散性能如何影响沿着工艺链形成的结构以及对所需产品性能的相应后果。在该项目的第一个资助期内，一些因素的影响已经得到了表征，并通过耦合CFD-DEM-模拟为虚拟工作原理的模拟访问奠定了基础。在整个第二个资助期内，应使用并完善这些结果，以作为描述流变特性的预测分析模型的参数。除了颗粒特性外，反应动力学在纤维增强复合材料领域中也是非常重要的。反应动力学本身受到许多参数的影响，这些参数应在扩展的实验表征后进行建模。此外，还应进一步评估机械应力模型的有效性，以便深入了解层流剪切流中的分散机制。

Disperse properties of particles like primary and secondary particle size, particle size distribution, aggregate structure, particle morphology and surface functionalization have significant effect on the processing and application of fiber-reinforced nanocomposites. Up to this time, only vague models exist for the description of these interdependencies. The fundamental question which needs to be answered is how disperse properties affect the structures formed along the process chain and the corresponding consequences on desired product properties. During the first funding period of this project, the influence of some factors was already characterized and the foundation was laid for the simulative access of the hypothesized working principles via coupled CFD-DEM-simulations. Throughout the second funding period, these results shall be used and refined to serve as parameters for a predictive analytical model for the describing the rheological properties. Besides particle properties, reaction kinetics is of major importance in the field of fiber-reinforced composites. The reaction kinetic itself is influenced by numerous parameters which shall be modelled after an extended experimental characterization. In addition, the validity of the mechanistic stress model shall be assessed further in order to gain in-depth understanding of the dispersing mechanisms in laminar shear flow.