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Shape Memory Composite Sandwich Structures with Self-Healing Properties.

Fabrizio Quadrini1, Denise Bellisario1, Leandro Iorio1

  • 1Department of Industrial Engineering, University of Rome 'Tor Vergata', Via del Politecnico 1, 00133 Rome, Italy.

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|September 28, 2021
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Summary
This summary is machine-generated.

This study developed a self-healing shape memory polymer composite sandwich structure. It utilizes Polyurea/Formaldehyde microcapsules for rapid, thermally activated shape recovery and structural restoration up to 98%.

Keywords:
PU foamsmicro-capsulessandwich composite structuresself-healing capsuleshape memory polymer compositesshape memory properties

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Area of Science:

  • Materials Science
  • Polymer Science
  • Composite Materials

Background:

  • Thermosetting polyurethane (PU) foams are utilized in sandwich structures.
  • Shape memory polymers (SMPs) offer potential for self-healing applications.
  • Microcapsules can encapsulate healing agents for material repair.

Purpose of the Study:

  • To develop a self-healing shape memory polymer composite (SMPC) sandwich structure.
  • To investigate the shape memory (SM) and self-healing (SH) properties of the composite.
  • To assess the impact of Polyurea/Formaldehyde (PUF) microcapsules on the material's performance.

Main Methods:

  • Fabrication of PUF microcapsules containing Dicyclopentadiene (DCPD).
  • Incorporation of microcapsules into a PU foam core (<2 wt%).
  • Manufacturing of SMPC laminate skins using carbon fiber-reinforced (CFR) prepregs.
  • Mechanical testing and damage assessment via compression and bending.
  • Evaluation of SM and SH responses at 120 °C.

Main Results:

  • The composite structure exhibited excellent SM properties, with shape recovery up to 99%.
  • Integration of 0.5 wt% microcapsules enabled SH functionality, achieving structural restoration up to 98%.
  • Both SM and SH responses were rapid and thermally activated.

Conclusions:

  • The developed sandwich structure demonstrates significant shape memory and self-healing capabilities.
  • The combination of PU foam core and CFR-SMPC skins enhances SM properties.
  • The simple fabrication process makes this material suitable for various industrial applications.