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4D Printed Shape-Memory Elastomer for Thermally Programmable Soft Actuators.

Qingchuan Song1,2, Yunong Chen1, Viacheslav Slesarenko2

  • 1Laboratory of Process Technology, Department of Microsystems Engineering (IMTEK), NeptunLab, Georges-Köhler-Allee 103, Freiburg 79110, Germany.

ACS Applied Materials & Interfaces
|August 18, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel 3D printed shape-memory elastomer with elasticity below and above its transition temperature. This breakthrough enables elastic shape recovery across a wide temperature range, expanding material applications.

Keywords:
4D printingdigital light processingprogrammable pneumatic actuatorsshape memory elastomersshape memory polymers

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Additive Manufacturing

Background:

  • Polymeric shape-memory elastomers (SMEs) recover programmed shapes via external stimuli.
  • Current 3D printed SMEs lack elasticity below their transition temperature, limiting low-temperature applications.
  • Achieving elasticity across a broad temperature range in 3D printed SMEs is a significant challenge.

Purpose of the Study:

  • To develop a 3D printable shape-memory elastomer exhibiting elasticity both below and above its transition temperature.
  • To demonstrate the potential of this novel material for advanced actuator applications.

Main Methods:

  • Fabrication of a custom polyethylene glycol-based shape-memory elastomer using digital light processing (3D printing).
  • Characterization of the material's mechanical properties (Young's modulus) across a wide temperature range.
  • Programming and testing of pneumatic actuators fabricated from the developed elastomer.

Main Results:

  • The 3D printed shape-memory elastomer exhibits elasticity and stretchability below and above its transition temperature.
  • A significant difference (up to two orders of magnitude) in Young's modulus was observed at different temperatures.
  • This tunable modulus enabled the programming of pneumatic actuators for distinct movement modes.

Conclusions:

  • The developed polyethylene glycol-based shape-memory elastomer overcomes the limitations of existing 3D printed SMEs.
  • The material's temperature-dependent elasticity allows for versatile programming of shape-memory actuators.
  • This innovation broadens the application scope of shape-memory materials in elastic systems operating across diverse temperatures.