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Article

Influence of Atmospheric Conditions on Mechanical Properties of Polyamide with Different Content of Recycled Material in Selective Laser Sintering

1
Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, 10000 Zagreb, Croatia
2
Probotica d.o.o., 10000 Zagreb, Croatia
*
Author to whom correspondence should be addressed.
Academic Editors: Giovanni Gómez-Gras and Marco A. Pérez
Polymers 2022, 14(12), 2355; https://doi.org/10.3390/polym14122355
Received: 21 May 2022 / Revised: 6 June 2022 / Accepted: 7 June 2022 / Published: 10 June 2022
The price of material is an important factor when selecting the additive polymer procedure. In selective laser sintering (SLS), the price can be reduced by the recycling of material, i.e., with different shares of original and recycled material, as well as by the orientation of the product during manufacturing. Numerous tests warn that orientation in the direction of z axis should be as low as possible to reduce the total price of the product. The product also has to satisfy the influence of atmospheric conditions to which it is exposed during its lifetime, i.e., UV radiation and humid environment. UV light, with sun being its most common source, and average humidity in different parts of the world can be approximately from 20% to 90%, depending on time, day and geographic location. In this work, the test specimens have been made of original, mixed and 100% recycled material and then exposed to the influences of UV radiation and water absorption. After having been exposed to atmospheric conditions for a longer time, the mechanical properties of the polyamide products made by selective laser sintering were tested. The results show that exposure to UV radiation reduces tensile elongation at all ratios of recycled material and orientation of 70–90% except in the z direction, while in flexural deformation it is the other way around. The effect of water was observed only between the 7th–14th day of absorption with a decrease in strength until the deformation did not change. View Full-Text
Keywords: ageing; atmospheric conditions; flexural properties; orientation; polyamide; recycling; selective laser sintering; tensile properties; weathering conditions; water absorption ageing; atmospheric conditions; flexural properties; orientation; polyamide; recycling; selective laser sintering; tensile properties; weathering conditions; water absorption
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MDPI and ACS Style

Pilipović, A.; Ilinčić, P.; Bakić, A.; Kodvanj, J. Influence of Atmospheric Conditions on Mechanical Properties of Polyamide with Different Content of Recycled Material in Selective Laser Sintering. Polymers 2022, 14, 2355. https://doi.org/10.3390/polym14122355

AMA Style

Pilipović A, Ilinčić P, Bakić A, Kodvanj J. Influence of Atmospheric Conditions on Mechanical Properties of Polyamide with Different Content of Recycled Material in Selective Laser Sintering. Polymers. 2022; 14(12):2355. https://doi.org/10.3390/polym14122355

Chicago/Turabian Style

Pilipović, Ana, Petar Ilinčić, Ante Bakić, and Janoš Kodvanj. 2022. "Influence of Atmospheric Conditions on Mechanical Properties of Polyamide with Different Content of Recycled Material in Selective Laser Sintering" Polymers 14, no. 12: 2355. https://doi.org/10.3390/polym14122355

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