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On the Thermomechanical Behavior of 3D-Printed Specimens of Shape Memory R-PETG

From commercial pellets of recycled polyethylene terephthalate glycol (R-PETG), 1.75 mm diameter filaments for 3D printing were produced. By varying the filament’s deposition direction between 10° and 40° to the transversal axis, parallelepiped specimens were fabricated by additive manufacturing. Wh...

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Autores principales: Sava, Ștefan-Dumitru, Lohan, Nicoleta-Monica, Pricop, Bogdan, Popa, Mihai, Cimpoeșu, Nicanor, Comăneci, Radu-Ioachim, Bujoreanu, Leandru-Gheorghe
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10223659/
https://www.ncbi.nlm.nih.gov/pubmed/37242954
http://dx.doi.org/10.3390/polym15102378
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author Sava, Ștefan-Dumitru
Lohan, Nicoleta-Monica
Pricop, Bogdan
Popa, Mihai
Cimpoeșu, Nicanor
Comăneci, Radu-Ioachim
Bujoreanu, Leandru-Gheorghe
author_facet Sava, Ștefan-Dumitru
Lohan, Nicoleta-Monica
Pricop, Bogdan
Popa, Mihai
Cimpoeșu, Nicanor
Comăneci, Radu-Ioachim
Bujoreanu, Leandru-Gheorghe
author_sort Sava, Ștefan-Dumitru
collection PubMed
description From commercial pellets of recycled polyethylene terephthalate glycol (R-PETG), 1.75 mm diameter filaments for 3D printing were produced. By varying the filament’s deposition direction between 10° and 40° to the transversal axis, parallelepiped specimens were fabricated by additive manufacturing. When bent at room temperature (RT), both the filaments and the 3D-printed specimens recovered their shape during heating, either without any constraint or while lifting a load over a certain distance. In this way, free-recovery and work-generating shape memory effects (SMEs) were developed. The former could be repeated without any visible fatigue marks for as much as 20 heating (to 90 °C)-RT cooling–bending cycles, while the latter enabled the lifting of loads over 50 times heavier than the active specimens. Tensile static failure tests revealed the superiority of the specimens printed at larger angles over those printed at 10°, since the specimens printed at 40° had tensile failure stresses and strains over 35 MPa and 8.5%, respectively. Scanning electron microscopy (SEM) fractographs displayed the structure of the successively deposited layers and a shredding tendency enhanced by the increase in the deposition angle. Differential scanning calorimetry (DSC) analysis enabled the identification of the glass transition between 67.5 and 77.3 °C, which might explain the occurrence of SMEs in both the filament and 3D-printed specimens. Dynamic mechanical analysis (DMA) emphasized a local increase in storage modulus of 0.87–1.66 GPa that occurred during heating, which might explain the development of work-generating SME in both filament and 3D-printed specimens. These properties recommend 3D-printed parts made of R-PETG as active elements in low-price lightweight actuators operating between RT and 63 °C.
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spelling pubmed-102236592023-05-28 On the Thermomechanical Behavior of 3D-Printed Specimens of Shape Memory R-PETG Sava, Ștefan-Dumitru Lohan, Nicoleta-Monica Pricop, Bogdan Popa, Mihai Cimpoeșu, Nicanor Comăneci, Radu-Ioachim Bujoreanu, Leandru-Gheorghe Polymers (Basel) Article From commercial pellets of recycled polyethylene terephthalate glycol (R-PETG), 1.75 mm diameter filaments for 3D printing were produced. By varying the filament’s deposition direction between 10° and 40° to the transversal axis, parallelepiped specimens were fabricated by additive manufacturing. When bent at room temperature (RT), both the filaments and the 3D-printed specimens recovered their shape during heating, either without any constraint or while lifting a load over a certain distance. In this way, free-recovery and work-generating shape memory effects (SMEs) were developed. The former could be repeated without any visible fatigue marks for as much as 20 heating (to 90 °C)-RT cooling–bending cycles, while the latter enabled the lifting of loads over 50 times heavier than the active specimens. Tensile static failure tests revealed the superiority of the specimens printed at larger angles over those printed at 10°, since the specimens printed at 40° had tensile failure stresses and strains over 35 MPa and 8.5%, respectively. Scanning electron microscopy (SEM) fractographs displayed the structure of the successively deposited layers and a shredding tendency enhanced by the increase in the deposition angle. Differential scanning calorimetry (DSC) analysis enabled the identification of the glass transition between 67.5 and 77.3 °C, which might explain the occurrence of SMEs in both the filament and 3D-printed specimens. Dynamic mechanical analysis (DMA) emphasized a local increase in storage modulus of 0.87–1.66 GPa that occurred during heating, which might explain the development of work-generating SME in both filament and 3D-printed specimens. These properties recommend 3D-printed parts made of R-PETG as active elements in low-price lightweight actuators operating between RT and 63 °C. MDPI 2023-05-19 /pmc/articles/PMC10223659/ /pubmed/37242954 http://dx.doi.org/10.3390/polym15102378 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Sava, Ștefan-Dumitru
Lohan, Nicoleta-Monica
Pricop, Bogdan
Popa, Mihai
Cimpoeșu, Nicanor
Comăneci, Radu-Ioachim
Bujoreanu, Leandru-Gheorghe
On the Thermomechanical Behavior of 3D-Printed Specimens of Shape Memory R-PETG
title On the Thermomechanical Behavior of 3D-Printed Specimens of Shape Memory R-PETG
title_full On the Thermomechanical Behavior of 3D-Printed Specimens of Shape Memory R-PETG
title_fullStr On the Thermomechanical Behavior of 3D-Printed Specimens of Shape Memory R-PETG
title_full_unstemmed On the Thermomechanical Behavior of 3D-Printed Specimens of Shape Memory R-PETG
title_short On the Thermomechanical Behavior of 3D-Printed Specimens of Shape Memory R-PETG
title_sort on the thermomechanical behavior of 3d-printed specimens of shape memory r-petg
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10223659/
https://www.ncbi.nlm.nih.gov/pubmed/37242954
http://dx.doi.org/10.3390/polym15102378
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