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- W4288808832 abstract "This research exposes a new methodology to follow the evolution of polymer crystallinity during material extrusion thanks to the use of thermocouples and fast scanning calorimetry (FSC). Micrometric thermocouples allowed recording the thermal history at different locations on a polypropylene (PP) part, which was then used to reproduce the thermal process conditions in FSC. This method allows to precisely study the evolution of PP crystallinity as function of time, which is an important feature to predict the printability of polymers, since crystallization is known to restrain fusion between beads. The results highlighted the dependence of the periodic thermal stress undergone by PP on several characteristics ( e.g. layer surface area, location in the part, filling strategy). Therefore, the crystallization behavior was found to be different depending on the location in the part. Crystallization was delayed at the center of the part compared to the edges because the nozzle sweep frequency was higher at the center, resulting in lower cooling kinetics. • The evolution of a polymer crystallinity was measured during a production run. • The crystallization kinetics of a polymer depend on the location in the part. • The crystallization kinetics could be controlled by adjusting the deposition pathway. • A partial crystal re-melt was observed during the deposition of successive layers." @default.
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- W4288808832 date "2022-10-01" @default.
- W4288808832 modified "2023-09-26" @default.
- W4288808832 title "On the temperature evolution and related crystallinity of polypropylene parts processed via material extrusion" @default.
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- W4288808832 doi "https://doi.org/10.1016/j.addma.2022.103065" @default.
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