Rheology of nanoparticulate epoxy suspensions

颗粒的分散特性，如一次和二次颗粒尺寸、颗粒尺寸分布、聚集体结构、颗粒形态和表面功能化等，对纤维增强纳米复合材料的加工和应用有重要影响。到目前为止，对于这些相互依赖的描述，只有模糊的模型存在。需要回答的基本问题是分散性质如何影响沿过程链形成的结构以及相应的对所需产品性质的影响。在本项目的第一个资助期内，已经对一些因素的影响进行了表征，为通过CFD-DEM-模拟耦合的方式模拟访问假设的工作原理奠定了基础。在第二个资助期内，应使用和改进这些结果，以作为描述流变性的预测性分析模型的参数。在纤维增强复合材料领域，除了颗粒特性之外，反应动力学也是一个重要因素。反应动力学本身受到许多参数的影响，这些参数应该在扩展的实验表征之后进行建模。此外，还应进一步评估力学应力模型的有效性，以便深入了解层流剪切流中的扩散机制。

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.