Polypropylene components with improved mechanical properties through adjustment of the morphologies (T10# (Antr.T04))

聚丙烯是一种商品聚合物，由于现有系统尚未充分开发聚丙烯材料的潜力，因此尚未完全在激光粉末床熔融(PBF-LB/P)市场上占据一席之地。这是联合项目目标的起点，主要包括通过有针对性的微观和宏观结构修改来改善聚丙烯组件的机械性能。因此，使用成核剂来调整零件的结晶变质和球晶尺寸。首先，在实验室的工艺条件下研究特定选择的成核剂的结晶行为，以确保相在工艺边界条件下是稳定的。其次，对选定的体系进行了工艺研究，并对其力学性能进行了分析。利用这些结果，确定了PBF-LB/P中对PP的最佳改性。此外，还对PBF-LB/P中微观结构的影响作了概括性的论述。由于整个工艺链是从合成开始的，所以通过原位合成(多相共聚物、丙烯-1-丁烯-乙烯三元共聚物)来确定聚丙烯的化学结构，并考虑了各种具有弹性体含量的聚丙烯的机械复合(非原位)。这使得能够彻底检查在聚丙烯基质中加入弹性组分的各种方法对工艺的影响。同样，定制材料合成的可能性使研究各种弹性组件成为可能，从而使系统能够根据需要进行专门的定制。总体而言，充分利用这一复杂材料系统的机械性能是可能的，揭示了需要延性材料行为的新应用。

Polypropylene is a commodity polymer that has not completely established a position in the laser-based powder bed fusion (PBF-LB/P) market since existing systems do not yet exploit the full potential of the polypropylene material. This is the starting point for the joint project's objectives, which mainly include improving the mechanical performance of polypropylene components through targeted micro and macrostructure modification. As a result, nucleating agents are used to adjust the crystallization modification and spherulite size of the part. First, the crystallization behavior of specific selected nucleating agents is investigated under process conditions in the laboratory to ensure that the phases are stable under process boundary conditions. Next, the process investigations are conducted with selected systems, and the mechanical properties are analyzed. Using these results, the best modifications for Polypropylene in PBF-LB/P are determined. Furthermore, a general statement about the influence of the microstructure in PBF-LB/P is made. Since the entire process chain is represented beginning with synthesis the chemical structure of polypropylene is set via in situ synthesizing (heterophasic copolymers, terpolymer of propylene-1-butene-ethylene), and the mechanical compounding (ex situ) of various polypropylene with elastomeric contents is considered. This enables a thorough examination on the impact of the various approaches to incorporating the elastic components in the polypropylene matrix on the process. Similarly, the potential for a tailored material synthesis makes it possible to investigate various elastic components, enabling the system to be specifically tailored to the needs. Overall, it is possible to fully utilize the mechanical properties of this intricate material system, revealing new applications that call for ductile material behaviors.