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A Fast-Responding Electro-Activated Shape Memory Polymer Composite with Embedded 3D Interconnected Graphene Foam.

Yucheng Zhou1, Jianxin Zhou1, Jiasheng Rong1

  • 1State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education, Institute of Nanoscience and College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

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|October 27, 2022
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Summary
This summary is machine-generated.

This study introduces a novel shape memory composite integrating graphene foam into polymers. This material enables rapid, internal shape control and recovery using simple electrical heating, overcoming limitations of traditional shape memory polymers.

Keywords:
electro-activatedelectrothermal responseshape memory polymersthree-dimensional interconnected graphene foam

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Shape memory polymers (SMPs) are intelligent morphing materials but require external heating for deformation and temperature control.
  • Polymers' inherent electrical insulation and poor thermal conductivity limit their practical applications and design flexibility.
  • Current methods for SMP control often involve complex external devices, leading to design challenges and interface fragility.

Purpose of the Study:

  • To develop a shape memory composite with integrated, reliable temperature and shape control functions.
  • To overcome the limitations of conventional SMPs by incorporating a conductive filler.
  • To demonstrate rapid shape recovery using an internal heating mechanism.

Main Methods:

  • Fabrication of a composite material by integrating three-dimensional interconnected graphene foam (3DGF) into a resin-based SMP matrix.
  • Characterization of the composite's electrical conductivity, thermal conductivity, tensile strength, and shape memory properties.
  • Evaluation of shape recovery performance using a Joule heating scheme with varying graphene foam content (0.26 wt%).

Main Results:

  • The composite exhibited significantly enhanced electrical conductivity (15 orders of magnitude increase) and thermal conductivity (180% improvement).
  • Tensile strength was improved by 64.8%, and the shape recovery speed increased by 154% compared to the base polymer.
  • Decimeter-sized samples demonstrated rapid shape deformation and recovery in under 10 seconds via Joule heating.

Conclusions:

  • The developed shape memory composite effectively integrates shape and temperature control within the material itself.
  • The incorporation of a small amount of 3DGF dramatically enhances the performance of SMPs, enabling efficient Joule heating.
  • This novel composite offers a promising solution for advanced morphing applications requiring fast, reliable, and internally controlled shape changes.