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Article

Mono–Material 4D Printing of Digital Shape–Memory Components

1
Architecture Department, Faculty of Engineering, Ain Shams University, Cairo 11566, Egypt
2
Design and Production Engineering Department, Faculty of Engineering, Ain Shams University, Cairo 11566, Egypt
*
Author to whom correspondence should be addressed.
Academic Editors: Somen K. Bhudolia, Andrea Ehrmann and Sunil Chandrakant Joshi
Polymers 2021, 13(21), 3767; https://doi.org/10.3390/polym13213767
Received: 7 September 2021 / Revised: 27 October 2021 / Accepted: 28 October 2021 / Published: 30 October 2021
(This article belongs to the Special Issue Advanced Thermoplastic Polymers and Composites)
Dynamic shading systems in buildings help reduce solar gain. Actuated systems, which depend on renewable energy with reduced mechanical parts, further reduce building energy consumption compared to traditional interactive systems. This paper investigates stimuli-responsive polymer application in architectural products for sustainable energy consumption, complying with sustainable development goals (SDGs). The proposed research method posits that, by varying the infill percentage in a pre-determined manner inside a 3D-printed mono-material component, directionally controlled shape change can be detected due to thermal stimuli application. Thus, motion behavior can be engineered into a material. In this study, PLA+, PETG, TPU and PA 6 printed components are investigated under a thermal cycle test to identify a thermally responsive shape-memory polymer candidate that actuates within the built environment temperature range. A differential scanning calorimetry (DSC) test is carried out on TPU 95A and PA 6 to interpret the material shape response in terms of transitional temperatures. All materials tested show an anisotropic shape-change reaction in a pre-programmed manner, complying with the behavior engineered into the matter. Four-dimensional (4D)-printed PA6 shows shape-shifting behavior and total recovery to initial position within the built environment temperature range. View Full-Text
Keywords: 4D printing; material programming; digital fabrication; shape-memory polymers 4D printing; material programming; digital fabrication; shape-memory polymers
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MDPI and ACS Style

Niazy, D.; Elsabbagh, A.; Ismail, M.R. Mono–Material 4D Printing of Digital Shape–Memory Components. Polymers 2021, 13, 3767. https://doi.org/10.3390/polym13213767

AMA Style

Niazy D, Elsabbagh A, Ismail MR. Mono–Material 4D Printing of Digital Shape–Memory Components. Polymers. 2021; 13(21):3767. https://doi.org/10.3390/polym13213767

Chicago/Turabian Style

Niazy, Dalia, Ahmed Elsabbagh, and Mostafa R. Ismail. 2021. "Mono–Material 4D Printing of Digital Shape–Memory Components" Polymers 13, no. 21: 3767. https://doi.org/10.3390/polym13213767

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