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Solution-Blown Core-Shell Self-Healing Nano- and Microfibers.

Min Wook Lee1, Sam S Yoon2, Alexander L Yarin1,2

  • 1Department of Mechanical and Industrial Engineering, University of Illinois , Chicago, Illinois 60607-7022, United States.

ACS Applied Materials & Interfaces
|February 3, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed faster, industrially scalable self-healing microfibers using a novel solution-blowing technique. These core-shell epoxy microfibers demonstrate effective damage repair through controlled release and polymerization.

Keywords:
adhesioncore−shell fibersnano-/microfibersself-healingsolution blowing

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Self-healing materials offer autonomous damage repair capabilities.
  • Microfibers provide a versatile platform for incorporating healing agents.
  • Previous methods like electrospinning were slow and difficult to scale.

Purpose of the Study:

  • To develop and characterize self-healing microfibers with a core-shell geometry.
  • To investigate the use of solution blowing for efficient microfiber fabrication.
  • To evaluate the self-healing performance and mechanical properties of the developed microfibers.

Main Methods:

  • Fabrication of core-shell microfibers using coaxial nozzles and solution blowing.
  • Encapsulation of a commercial binary epoxy resin and hardener in separate fiber cores.
  • Assessment of fiber diameters ranging from 0.2 to 2.6 μm.
  • Performance evaluation using blister tests to measure adhesion and cohesion energies before and after healing.

Main Results:

  • Solution blowing achieved fabrication speeds at least 30 times faster than electrospinning and is industrially scalable.
  • Core-shell microfibers successfully demonstrated self-healing through epoxy release and polymerization upon damage.
  • Larger fiber diameters accelerated healing agent release and reduced solidification time.
  • The chosen epoxy exhibited superior strength and faster solidification compared to previous materials like PDMS.

Conclusions:

  • Solution-blown core-shell microfibers represent a significant advancement in scalable self-healing material technology.
  • The developed microfibers offer enhanced self-healing efficiency and mechanical integrity.
  • This approach holds promise for applications requiring autonomous damage repair in structural composites and coatings.