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. 2020 Feb 2;12(2):293.
doi: 10.3390/polym12020293.

The Effect of Crystallinity on the Toughness of Cast Polyamide 6 Rods With Different Diameters

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Free PMC article

The Effect of Crystallinity on the Toughness of Cast Polyamide 6 Rods With Different Diameters

Miklós Odrobina et al. Polymers (Basel). .
Free PMC article

Abstract

The present paper concentrates on the toughness and the degree of crystallinity of the magnesium-catalyzed polyamide 6 rods cast in different diametres, which are commonly used for gear manufacturing. Its toughness cannot be regarded as a constant feature due to the casting technology. The mechanical properties of the semi-finished products are sensitive to the manufactured dimension, e.g., cast diameter, which are investigated by the Charpy impact test and tensile impact test. It is generally accepted that the impact strength and tensile-impact strength correlate with the degree of crystallinity beside many other material's feature. Crystallinity is evaluated by Differential Scanning Calorimetry. The aim of this study is to determine the relationship between toughness and crystallinity of the magnesium-catalyzed cast PA6 rods with different diameters. For the research cast rods between 40 and 300 mm diameter were selected in seven-dimensional steps. Based on the results, it was found that the toughness depends strongly on the diameter size. Furthermore, it is proved that the crystallinity explains 62.3% of the variation of the Charpy's impact strengths, while the tensile impact method was not suitable to detect the difference between the test samples.

Keywords: Charpy’s impact test; degree of crystallinity; magnesium-catalyzed; polyamide 6; toughness.

Conflict of interest statement

The authors declare no known conflict of interest associated with this publication.

Figures

Figure A1
Figure A1
Scanning electron micrographs of the fracture surface of Charpy specimens, the highest impact strength for the 60 mm rod at magnification of 500 times.
Figure A2
Figure A2
Scanning electron micrographs of the fracture surface of Charpy specimens, the highest impact strength for the 60 mm rod at magnification of 1000 times.
Figure A3
Figure A3
Scanning electron micrographs of the fracture surface of Charpy specimens, the lowest impact strength for the 300 mm rod at magnification of 500 times.
Figure A4
Figure A4
Scanning electron micrographs of the fracture surface of Charpy specimens, the lowest impact strength for the 300 mm rod at magnification of 1000 times.
Figure 1
Figure 1
Scheme of the sample location.
Figure 2
Figure 2
Charpy impact strength in the range from 40 to 300 mm.
Figure 3
Figure 3
Tensile impact strength in the range from 40 to 300 mm.
Figure 4
Figure 4
Scanning electron micrographs of the fracture surface of the Charpy specimens, the highest impact strength for the 60 mm rod at a magnification of 200 times.
Figure 5
Figure 5
Scanning electron micrographs of the fracture surface of the Charpy specimens, the lowest impact strength for the 300 mm rod at magnification of 200 times.
Figure 6
Figure 6
Detailed toughness test for a 300 mm diameter rod.
Figure 7
Figure 7
The relationship between the degree of crystallinity and Charpy impact strength in the case of magnesium-catalyzed semi-finished rods.
Figure 8
Figure 8
The relationship between Charpy impact strength and crystallinity in the 300 mm diameter of magnesium-catalyzed cast semi-finished rods.
Figure 9
Figure 9
The measure data and fitted function.

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