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In Situ WAXD and SAXS during Tensile Deformation Of Moulded and Sintered Polyamide 12

1
Department of Mechanical Engineering, Materials Technology Institute, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
2
Brightlands Materials Center (BMC), P.O. Box 18, 6160 MD Geleen, The Netherlands
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(6), 1001; https://doi.org/10.3390/polym11061001
Received: 1 May 2019 / Revised: 24 May 2019 / Accepted: 27 May 2019 / Published: 5 June 2019
(This article belongs to the Special Issue Additive Manufacturing of Polymeric Materials)
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Abstract

To provide knowledge to improve the mechanical performance of Polyamide 12 (PA12) sintered products, we have studied experimentally the mechanical response and structure development under constant strain rate of compression moulded and laser sintered PA12 by means of in situ small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) experiments. It is found that at low temperatures, i.e., below the glass transition temperature, the brittle failure of laser sintered samples is determined by the fast formation of voids that originate at the beginning of the macroscopic plastic deformation. This effect appears to be faster at temperatures below room temperature and it is less effective at higher temperatures. When tested at 120 C, sintered PA12 shows a better mechanical response in terms of yield stress and a comparable strain at break with respect to moulded PA12. This can be explained by considering that sintered samples have slightly thicker crystals that can sustain higher stress at high temperature. However, this also leads to the formation of a larger number of voids at low testing temperatures. This work does not attempt to quantify the micromechanics behind crystals deformation and disruption, but it provides a deeper insight in the difference between the mechanical response of moulded and sintered PA12. View Full-Text
Keywords: SLS; mechanical properties; Polyamide 12; SAXS; WAXD SLS; mechanical properties; Polyamide 12; SAXS; WAXD
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Paolucci, F.; Govaert, L.; Peters, G. In Situ WAXD and SAXS during Tensile Deformation Of Moulded and Sintered Polyamide 12. Polymers 2019, 11, 1001.

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