Interaction between epoxy matrix and nanoparticle

TP1在第一个资助期的核心任务是对纳米颗粒(NP)改性纤维增强聚合物(FRP)的机械性能进行定量成像分析。基于AFM的玻璃钢局部物理化学性能分析表明，颗粒-基质界面对玻璃钢的力学性能有很大的影响，这是表面改性的结果。在亚微米尺度上的计算结果与宏观力学实验结果，如弯曲弹性、拉伸弹性、断裂伸长率和断裂拉应力等，都有很好的一致性。第一个周期集中在初生颗粒(14 Nm)及其与基质的界面上。在第二阶段，还将对凝聚体进行测量。根据纳米颗粒之间的界面进行了研究，并评估了它们在机械载荷下的作用。此外，这项工作将从两个方向进行，以全面了解通过嵌入NP来使FRP沿工艺链的性能变化。为了详细地研究颗粒表面的影响，Garnweitners教授小组以高度明确的方式对NP进行了化学修饰。这些纳米粒子被嵌入实验室规模，并通过原子力显微镜和介电光谱学方法在Silbernagl/Sturm组中进行检查。这里，保留了交互方法，以提供嵌入纳米颗粒的机械属性图，用于数值建模(TP2，Rolfes教授小组)。此外，分析组合还配有宽带介电光谱分析(BDS；Group Silbernagl/Sturm)。与原子力显微镜不同的是，这种方法不是基于成像的，而是在毫米？区域内对材料体积进行整体测量。然而，这种方法提供了分子迁移率，因此在分子水平上提供了更高的灵敏度，就像原子力显微镜：在不同颗粒浓度下的频率依赖研究显示了颗粒的数量以及它们的基质相互作用或界面。依赖于温度的BDS可以得出分子的流动性是局域的还是合作的结论。除了分析和合成核心任务外，TP1还与TP4合作，引入了一种新技术，利用该技术，可以使用纳米载体羊毛在复合材料的关键点将NP包括在内。这些NP被嵌入到电纺热塑性纤维中。最终的织物可以放置在模具中，纤维溶解在注射的热环氧树脂中，将纳米颗粒留在基质中(Silbernagl/Sturm组)。

The core task of the TP1 in the first funding period was the quantitative imaging analysis of the mechanical properties of a nanoparticle (NP)-modified fiber-reinforced polymer (FRP). AFM-based local analysis of physico-chemical properties of the FRP showed the strong influence of the particle-matrix interphase on the mechanical properties as a function of surface modification. It has also shown that the results on the sub-micron scale agree very well with the results of macroscopic mechanical experiments such as flexural modulus, tensile modulus, elongation at break and tensile stress at break. The first period was focused on primary particles (14nm) and their interphase to the matrix. In the second period also measurements on agglomerates will be performed. These are studied in terms of the interphase between the nanoparticles and evaluated for their role under mechanical load. In addition, the work will be developed in two directions in order to obtain a comprehensive understanding of the property change of FRP along the process chain by embedding the NP.In order to investigate the influence of the particle surface in detail, chemical modification of the NP in a highly defined manner is carried out by Prof. Garnweitners group. These nanoparticles are embedded on a laboratory scale and examined by AFM and dielectric spectroscopy methods in the group Silbernagl/Sturm. Here, the interactive approach is retained to provide mechanical property maps of the embedded nanoparticles for use in numerical modelling (TP2, group of Prof. Rolfes). In addition, the analysis portfolio is complemented with broadband dielectric spectroscopy (BDS; group Silbernagl/Sturm). In contrast to AFM this method is not imaging-based but measures integrally over a material volume in mm³ area. However, this method provides molecular mobilities and thus even offers a higher sensitivity at the molecular level as the AFM: Frequency-dependent studies at various particle concentrations show the amount of particles and separately their matrix interactions or interphase. Temperature-dependent BDS allows conclusions whether molecular mobility is localized or cooperative. In addition to the analytical and synthetic core task TP1 cooperates with TP4 for introducing a new technique with which NP can be included at critical points in the composite material using nano-carrier fleece. These NP are embedded in electrospun thermoplastic fibers. The resulting fabric can be placed in the mold specifically, the fiber dissolves in the injected hot epoxy resin, leaving the nanoparticles in the matrix (Silbernagl/Sturm group).