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Mono-Material 4D Printing of Digital Shape-Memory Components.

Dalia Niazy1, Ahmed Elsabbagh2, Mostafa R Ismail1

  • 1Architecture Department, Faculty of Engineering, Ain Shams University, Cairo 11566, Egypt.

Polymers
|November 13, 2021
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Summary

This study explores 4D-printed polymers for dynamic building shading. PA6 demonstrated shape-shifting abilities within typical building temperatures, offering a sustainable solution for energy efficiency.

Keywords:
4D printingdigital fabricationmaterial programmingshape-memory polymers

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Area of Science:

  • Materials Science
  • Sustainable Architecture
  • Polymer Engineering

Background:

  • Dynamic shading systems reduce solar gain in buildings.
  • Actuated systems using renewable energy offer energy savings over traditional interactive systems.
  • Sustainable Development Goals (SDGs) emphasize energy efficiency in the built environment.

Purpose of the Study:

  • To investigate stimuli-responsive polymers for architectural applications.
  • To engineer motion behavior into 3D-printed materials via controlled shape change.
  • To identify a thermally responsive shape-memory polymer for dynamic shading systems.

Main Methods:

  • 3D printing of mono-material components with varied infill percentages (PLA+, PETG, TPU, PA6).
  • Thermal cycle testing to evaluate shape change under temperature variations.
  • Differential Scanning Calorimetry (DSC) to analyze transitional temperatures of selected polymers (TPU 95A, PA6).

Main Results:

  • All tested materials exhibited anisotropic, pre-programmed shape-change reactions.
  • Four-dimensional (4D)-printed PA6 demonstrated shape-shifting behavior.
  • PA6 showed complete recovery to its initial shape within the built environment's temperature range.

Conclusions:

  • Motion behavior can be successfully engineered into 3D-printed materials through controlled infill variations.
  • PA6 is a promising candidate for 4D-printed architectural components due to its thermal responsiveness.
  • The developed technology aligns with sustainable energy consumption and SDG targets for buildings.