Simulation of Solidification of a Nucleated Isotactic Polypropylene in a Quiescent Condition
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Nucleating agents play an important role as additives in the production of injection-moulded components from semi-crystalline thermoplastics. To date, however, no work has been published in the scientific literature, which simulates the influence of nucleating agents on the formation of the microstructure of semi-crystalline thermoplastics. This research gap is to be closed within the framework of the research.
The aim of previous researches at the Institute for Plastics Processing (IKV) was to predict the microstructure of injection-moulded components using an in-house developed model to describe the crystallisation of semi-crystalline thermoplastics, which was implemented into software, called “SphaeroSim”. Although, it was able to simulate only a homogeneous pure melt without any additive. Within this work, the SphaeroSim is further developed to consider the additives and to distinguish between alpha- and beta nucleating agents. To consider the nucleating agents, the possibility to set up predefined nuclei is added to the model. Finally, the growth rate of beta crystals is measured on the hot stage at different temperatures to realise the consideration of beta nucleating agents. Finally, the solidification process on the hot stage is simulated and compared to the experimental results.
KeywordsCrystallisation Semi-crystalline thermoplastics Multi-scale simulation
This dedicated research has been funded by the Deutsche Forschungsgemeinschaft (DFG) as a part of the project “Simulation of the development of the microstructure of injection-moulded semi-crystalline thermoplastics by means of a multi-scale approach under consideration of shear-induced crystal forms (alpha and beta)” (Project-ID: HO 4776/53-1). We would like to extend our thanks to the DFG.
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