Characterization of core-shell microstructure and self-healing performance of electrospun fiber coatings

Thu Q. Doan, L. Suzanne Leslie, Sang Yup Kim, Rohit Bhargava, Scott R. White, Nancy R. Sottos

Research output: Contribution to journalArticle

Abstract

Electrospun fibers are a promising method for encapsulation of reactive agents in self-healing coatings. Healing is initiated by mechanical damage to the coating causing the fibers to rupture and release their core materials into the damage region. Prior work has demonstrated autonomous healing in coatings containing electrospun fibers, but full characterization of the electrospun fiber microstructure and healing performance of the coating is lacking. In this study, we utilize electrospun fibers containing liquid healing agents to achieve a crosslinking reaction of poly(dimethylsiloxane) (PDMS) to a crosslinking agent poly(diethoxysiloxane) (PDES), initiated by the catalyst dibutyltindilaurate (DBTL), to fill a damaged region and reseal the metal substrate. Fiber morphology is characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and confocal fluorescence microscopy (CFM). Successful delivery of healing agents to the damage region and subsequent crosslinking reaction is observed using SEM and chemically using infrared spectroscopy. The performance of the healed coating is evaluated electrochemically using linear polarization, where the coatings were subjected to a corrosive environment. The self-healing electrospun coating exhibits lower corrosion current than in control cases, resulting in an 88% corrosion inhibition efficiency.

Original languageEnglish (US)
Pages (from-to)263-272
Number of pages10
JournalPolymer
Volume107
DOIs
StatePublished - Dec 19 2016

Fingerprint

Coatings
Microstructure
Fibers
Crosslinking
Corrosion
Caustics
Scanning electron microscopy
Confocal microscopy
Fluorescence microscopy
Polydimethylsiloxane
Encapsulation
Infrared spectroscopy
Metals
Polarization
Transmission electron microscopy
Catalysts
Liquids
Substrates

Keywords

  • Coating
  • Core-shell fibers
  • Corrosion
  • Electrospinning
  • Encapsulation
  • Self-healing

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

Characterization of core-shell microstructure and self-healing performance of electrospun fiber coatings. / Doan, Thu Q.; Leslie, L. Suzanne; Kim, Sang Yup; Bhargava, Rohit; White, Scott R.; Sottos, Nancy R.

In: Polymer, Vol. 107, 19.12.2016, p. 263-272.

Research output: Contribution to journalArticle

Doan, Thu Q. ; Leslie, L. Suzanne ; Kim, Sang Yup ; Bhargava, Rohit ; White, Scott R. ; Sottos, Nancy R. / Characterization of core-shell microstructure and self-healing performance of electrospun fiber coatings. In: Polymer. 2016 ; Vol. 107. pp. 263-272.
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