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，在基于激光的粉末床熔融（PBF-LB/P）市场中尚未完全确立地位，因为现有系统尚未充分利用聚丙烯材料的潜力。这是联合项目目标的出发点，主要包括通过有针对性的微观和宏观结构改性来提高聚丙烯构件的力学性能。因此，使用成核剂来调节零件的结晶改性和球晶尺寸。首先，在实验室的工艺条件下研究了选定的特定成核剂的结晶行为，以确保在工艺边界条件下相是稳定的。然后，对所选体系进行工艺研究，并对其力学性能进行分析。利用这些结果，确定了聚丙烯在PBF-LB/P中的最佳改性。此外，还对PBF-LB/P中微观结构的影响作了一般性的论述。由于整个过程链是从合成开始的，聚丙烯的化学结构是通过原位合成（异相共聚物，丙烯-1-丁烯-乙烯的三元共聚物）来确定的，并且考虑了各种具有弹性体含量的聚丙烯的机械复合（非原位）。这样就可以对在聚丙烯基体中加入弹性成分的各种方法对工艺的影响进行彻底的检查。同样，定制材料合成的潜力使得研究各种弹性成分成为可能，从而使系统能够专门针对需求进行定制。总的来说，充分利用这种复杂材料系统的机械性能是可能的，揭示了需要延展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.