Interaction between epoxy matrix and nanoparticle

在第一个资助期，TP1的核心任务是对纳米颗粒（NP）改性纤维增强聚合物（FRP）的力学性能进行定量成像分析。基于afm的FRP的局部理化性能分析表明，颗粒-基体界面相作为表面改性的函数对FRP的力学性能有很强的影响。亚微米尺度上的结果与宏观力学实验结果如弯曲模量、拉伸模量、断裂伸长率和断裂拉应力的结果吻合较好。第一期主要研究初生颗粒（14nm）及其与基体的间相。在第二个阶段，还将对团块进行测量。这些都是根据纳米颗粒之间的界面来研究的，并评估了它们在机械载荷下的作用。此外，该工作将在两个方向上发展，以便通过嵌入NP来全面了解FRP沿着工艺链的性能变化。为了详细研究颗粒表面的影响，Garnweitners教授小组对NP进行了高度明确的化学修饰。这些纳米颗粒在实验室规模上被嵌入，并通过原子力显微镜和介电光谱方法在Silbernagl/Sturm组中进行了检测。在这里，交互式方法被保留以提供用于数值模拟的嵌入纳米颗粒的力学特性图（TP2， Rolfes教授小组）。此外，该分析组合还补充了宽带介电光谱（BDS；集团Silbernagl/Sturm）。与AFM相比，该方法不是基于成像，而是以mm³面积为单位测量材料体积。然而，这种方法提供了分子的流动性，因此甚至在分子水平上提供了更高的灵敏度，因为AFM：不同颗粒浓度下的频率依赖研究显示了颗粒的数量，并分别显示了它们的基质相互作用或间期。依赖温度的北斗系统可以得出分子迁移是局部的还是协同的结论。除了分析和合成核心任务外，TP1还与TP4合作引入了一项新技术，该技术可以使用纳米载体羊毛将NP包含在复合材料的关键点上。这些NP嵌入在电纺丝热塑性纤维中。所得到的织物可以专门放置在模具中，纤维溶解在注入的热环氧树脂中，在基体中留下纳米颗粒（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).