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4D Printing of Electroactive Triple-Shape Composites.

Muhammad Yasar Razzaq1, Joamin Gonzalez-Gutierrez1, Muhammad Farhan2

  • 1Department of Materials Research and Technology, Luxembourg Institute of Science and Technology, ZAE Robert Steichen, L-4940 Hautcharage, Luxembourg.

Polymers
|February 28, 2023
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Summary

This study presents 4D printing of electro-active triple-shape polymers using polyester urethane (PEU) and polylactic acid (PLA) blends with carbon nanotubes. These 3D printed materials can achieve multiple shape changes triggered by electricity, enabling advanced applications.

Keywords:
4D printingadditive manufacturingelectro-active compositesshape-memory polymerstriple-shape effect

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Area of Science:

  • Materials Science
  • Polymer Science
  • Additive Manufacturing

Background:

  • Triple-shape polymers exhibit dual shape memory capabilities, enabling complex form changes.
  • Electro-active materials offer remote and precise shape control.
  • 4D printing integrates time-dependent shape transformations into 3D printed objects.

Purpose of the Study:

  • To develop and characterize electro-active triple-shape composites for 4D printing.
  • To demonstrate the controlled, stepwise shape recovery of 3D printed composites using electrical stimuli.
  • To explore the potential of these materials in advanced applications requiring shape memory and actuation.

Main Methods:

  • Preparation of thermoplastic blends of polyester urethane (PEU), polylactic acid (PLA), and multiwall carbon nanotubes (MWCNTs) via melt processing.
  • Characterization of composite morphology and thermal properties (T_m, T_g).
  • Fused filament fabrication (FFF) for 3D printing of triple-shape composite demonstrators.
  • Thermo-mechanical programming and stepwise electrical stimulation for shape recovery.

Main Results:

  • Successfully fabricated electro-active triple-shape composites with uniform MWCNT dispersion.
  • Identified distinct transition temperatures (T_m ~50°C for PEU, T_g ~61°C for PLA) suitable for programming.
  • Demonstrated controlled, stepwise shape recovery of 3D printed parts via resistive heating from electrical current.
  • Quantified the triple-shape effect in single and multi-material 3D printed objects.

Conclusions:

  • 4D printing of electro-active PEU/PLA/MWCNT composites enables programmable dual shape memory effects.
  • Electrical triggering provides a novel and precise method for actuating complex 3D printed structures.
  • These materials hold significant promise for applications in robotics, space exploration, and smart actuation systems.