Injection Molding and Morphology
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Leibniz-Institut für Polymerforschung Dresden Leibniz Gemeinschaft Injection Molding and Morphology Thermal and microscopic investigation methods are of essential importance to determine the process-structure- property relationships of the raw materials and the injection molded components. At the Leibniz-Institut fuer Polymerforschung Dresden e.V. they are used for the investigation of crystallization processes, process-induced morphology, interface effects, phase morphology and micromechanical failure behavior. The further development of preparation methods and investigation methods (correlative methods) are challenges that need to be addressed. Crystallization Processes corrected heat flow [J/gK] Crystallization Colling rate 10 K/min exothermic temperature 0 50 100 150 200 250 300 30 min 50 µm 45 min 50 µm isothermal Crystallization of PLA 50 µm 20 min Crystallization curves of different semi-crystalline thermoplastics [1]. Method: Differential Scanning Calorimetry (DSC). Isothermal spherulite growth of polylactide (PLA) [2]. Method: Thermal stage experiment on a light microscope with polarized light. -90 J/g -88 J/g -58 J/g -182 J/g -103 J/g -213 J/g 10 J/gK PA66 PA6 PBT POM PP PEHD Photo © Döring
Transcript of Injection Molding and Morphology
Leibniz-Institutfür PolymerforschungDresden
LeibnizGemeinschaft
Injection Molding and Morphology
Thermal and microscopic investigation methods are of essential importance to determine the process-structure-property relationships of the raw materials and the injection molded components. At the Leibniz-Institut fuer Polymerforschung Dresden e.V. they are used for the investigation of crystallization processes, process-induced morphology, interface effects, phase morphology and micromechanical failure behavior. The further development of preparation methods and investigation methods (correlative methods) are challenges that need to be addressed.
Crystallization Processes
corr
ecte
d h
eat
flo
w [
J/gK
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Crystallization Colling rate 10 K/min
exo
ther
mic
temperature
0 50 100 150 200 250 300
30 min
50 µm
45 min
50 µm
iso
the
rma
l C
ryst
all
iza
tio
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f P
LA
50 µm
20 min
Crystallization curves of different semi-crystalline thermoplastics [1]. Method: Differential Scanning Calorimetry (DSC).
Isothermal spherulite growth of polylactide (PLA) [2].Method: Thermal stage experiment on a light microscope with polarized light.
-90 J/g
-88 J/g
-58 J/g
-182 J/g
-103 J/g
-213 J/g
10 J/gK
PA66PA6PBTPOMPPPEHD
Photo © Döring
Process-Induced Morphology
Literature
1 Kuehnert, I., Schoenfeldt, A., Auf der Landwehr, M., New Insights into interfaces in injection molded parts, Proceedings ANTEC, Cincinnati, USA (2013)
2 Kuehnert, I., Berger, M., Zimmermann, M. Weld Line Behavior in Injection Molded Parts, Proceedings PPS31, Jeju Island, Korea (2015)
3 Spoerer, Y., Blanco, C., Zimmermann, M., Kuehnert, I, Morphology-property behavior of semi crystalline polymers in injection molded parts. AIP Conference Proceedings 2055 (2019)
4 Fischer, M., Ausias, G., Kuehnert, I. Investigation of interfacial behavior on injection molded parts. AIP Conference Proceedings 1713 (2016)
Injection molded polyamide interface under a polarized light microscope.Left: skin area (standard injection molding), center: weld line, V-notch at the skin [3], right: cold interface (multi-component injection molding)
Correlative Microscopy of the morphology of polyvinylidene fluoride (PVDF) - Polymethylmethacrylate (PMMA).Left: Polarized Light Microscopy, right: Scanning Electron Microscopy with element distribution of fluorine (red) and oxygen (blue).
Failure Behavior
Left: Thin-section tensile device in a polarized light microscope, center: PP / PP interface in tensile test, Scanning Electron Microscopy (SEM) [4] and necking in a tensile test on a thin section, Light Microscopy.
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Contact
Leibniz-Institut für Polymerforschung Dresden e. V.Department Processing TechnologyDr.-Ing. Ines KühnertE-Mail: [email protected] +49 (0)351 4658 368F +49 (0)351 4658 290
Hohe Straße 6 . 01069 Dresden . Germanywww.ipfdd.de
