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Ultrastretchable Elastic Shape Memory Fibers with Electrical Conductivity.

Sungjune Park1, Neil Baugh2, Hardil K Shah2

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Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
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Researchers developed novel shape memory elastomeric fibers using a gallium core. This innovation enables precise control over fiber shape and stiffness through mild heating, offering advanced material properties.

Keywords:
elastic shape memory fibersliquid metalsstretchable electronics

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Shape memory materials offer unique properties for advanced applications.
  • Previous shape memory fibers often utilized waxes, limiting their performance and tunability.
  • A need exists for more robust and controllable shape memory fiber technologies.

Purpose of the Study:

  • To introduce a novel method for creating shape memory elastomeric fibers.
  • To investigate the use of a gallium core for shape memory properties.
  • To demonstrate the tunability of fiber modulus and shape using gallium's phase transition.

Main Methods:

  • Gallium was injected into the core of hollow elastic fibers via melt processing.
  • The phase transition of the gallium core (solid to liquid) was induced by mild heating.
  • The change in fiber modulus and shape recovery were measured after deformation and heating.

Main Results:

  • The effective fiber modulus increased significantly from 4 MPa to 1253 MPa upon gallium solidification.
  • The gallium core enabled shape fixity and elastic energy storage in the polymer shell.
  • Local regions of the fiber could be melted and reshaped by hand due to gallium's melting point.

Conclusions:

  • Elastomeric fibers with shape memory properties were successfully fabricated using a gallium core.
  • Gallium offers advantages over waxes, including metallic conductivity and perfect shape fixity.
  • The developed fibers provide a tunable platform for advanced material applications requiring shape memory effects.