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Self-healing of polymers and composites

Self-healing of polymers and composites

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Since the first report of the self-repairing composites systems in the literature [1], a conventional strategy was developed by embedding a microencapsulated liquid healing agent and solid catalytic chemical materials within a polymer matrix. Thus, when there is damage induced cracking in the matrix, the microcapsules release their encapsulated liquid healing agent into the crack planes. All the materials involved must be carefully engineered. For example, the encapsulation procedure must be chemically compatible with the reactive healing agent, and the liquid healing agent must not diffuse out of the capsule shell during its shelf-life. At the same time, the microcapsule walls must be resistant to the processing conditions of the host composite. At the same time excellent adhesion with the cured polymer matrix has to be maintained to ensure that the capsules rupture upon composite fracture.

Chapter Contents:

  • 4.1 Microcapsules
  • 4.1 Microcapsules
  • 4.1.1 Effects of the size and the materials of microcapsules on self-healing reaction performance
  • 4.1.1 Effects of the size and the materials of microcapsules on self-healing reaction performance
  • 4.1.2 Retardation of fatigue cracks
  • 4.1.2 Retardation of fatigue cracks
  • 4.1.3 Delaminating substrate
  • 4.1.3 Delaminating substrate
  • 4.2 Choice of the healing agent/catalyst system
  • 4.2 Choice of the healing agent/catalyst system
  • 4.2.1 Healing agent
  • 4.2.1 Healing agent
  • 4.2.2 Ring opening metathesis polymerisation catalyst
  • 4.2.2 Ring opening metathesis polymerisation catalyst
  • 4.3 Free catalyst-based epoxy/hardener and solvent encapsulation systems
  • 4.3 Free catalyst-based epoxy/hardener and solvent encapsulation systems
  • 4.3.1 Epoxy/hardener system
  • 4.3.1 Epoxy/hardener system
  • 4.3.2 Solvent encapsulation
  • 4.3.2 Solvent encapsulation
  • 4.4 Hollow glass fibres systems – two component epoxies
  • 4.4 Hollow glass fibres systems – two component epoxies
  • 4.5 Microvascular networks systems
  • 4.5 Microvascular networks systems
  • 4.6 Self-healing coatings for metallic structures
  • 4.6 Self-healing coatings for metallic structures
  • References
  • References

Inspec keywords: polymerisation; cracks; adhesion; resins; encapsulation; curing; fracture; filled polymers

Other keywords: microencapsulated liquid healing agent; conventional strategy; host composite; encapsulated liquid healing agent; reactive healing agent; microcapsule walls; composites systems; encapsulation procedure; solid catalytic chemical materials; crack planes; microcapsules; damage induced; composite fracture; cured polymer matrix

Subjects: Polymer reactions and polymerization; Textbooks; Fatigue, brittleness, fracture, and cracks; Fatigue, embrittlement, and fracture

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