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Electrospun Multiple-Chamber Nanostructure and Its Potential Self-Healing Applications.

Yubo Liu1, Xinkuan Liu1, Ping Liu1

  • 1School of Materials Science & Engineering, University of Shanghai for Science & Technology, Shanghai 200093, China.

Polymers
|October 23, 2020
PubMed
Summary

New nanofibers encapsulate healing agents within an epoxy matrix, significantly enhancing material lifespan and providing effective anti-corrosion properties for structural applications.

Keywords:
complicated nanostructurecore-sheath nanofiberepoxy resinmultifluid electrospinningpolymeric composite

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Materials degradation limits the lifespan of products during daily use.
  • Developing self-healing materials is crucial for extending durability and reducing waste.

Purpose of the Study:

  • To create a novel self-healing epoxy matrix using advanced nanofiber technology.
  • To investigate the efficacy of encapsulated epoxy resin and amine curing agents within nanofibers for material repair.

Main Methods:

  • Multifluid electrospinning was employed to fabricate polyacrylonitrile (PAN) sheath-core nanofibers containing separate epoxy and amine cores.
  • Structural characterization utilized scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
  • Chemical composition and thermal properties were analyzed using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC).
  • Electrochemical corrosion experiments evaluated the anti-corrosion performance of the self-healing coatings.

Main Results:

  • Core-shell nanofibers with a three-chamber structure (PAN sheath, epoxy core, amine core) were successfully synthesized with an average diameter of 300 ± 140 nm.
  • Characterization confirmed the presence and separation of epoxy resin and amine curing agents within the nanofiber cores.
  • TGA revealed specific percentages of triethylenetetramine (9.06%) and cured epoxy (20.71%) within the nanofibers.
  • Self-healing coatings incorporating these nanofibers demonstrated superior anti-corrosion properties compared to control samples.

Conclusions:

  • The developed core-shell nanofibers act as effective nanoreactors for encapsulating reactive fluids.
  • Multifluid electrospinning provides a viable method for creating complex, multi-chamber nanostructures for self-healing applications.
  • This innovative approach holds significant potential for enhancing the durability and self-healing capabilities of structural materials.