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

Min Wook Lee, Suk Goo Yoon, Alexander Yarin

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Self-healing microfibers with core-shell geometry were studied. A commercial binary epoxy was encased in solution-blown polymer nano-/microfibers in the 0.2-2.6 μm diameter range. The core-shell microfibers were formed by coaxial nozzles, which encapsulated the epoxy resin and its hardener in separate cores. Solution blowing, the fiber-forming process used in this work, was at least 30 times faster than the electrospinning method used previously and has already been scaled up to the industrial level. These core-shell microfibers show self-healing capability, in which epoxy and hardener are released from the cores of damaged fibers, resulting in polymerization. The epoxy used had a higher strength and shorter solidification time than poly(dimethylsiloxane) (PDMS) used previously. Also, the larger fiber diameters in the present study facilitated faster release of the epoxy resin and its hardener from the fiber cores, shortening the solidification time in comparison to the previous studies. Blister tests were conducted, which measured the adhesion energy of microfiber mats to substrates and the cohesion energy between layers of microfiber mats before and after fatigue damage followed by self-healing.

Original languageEnglish
Pages (from-to)4955-4962
Number of pages8
JournalACS Applied Materials and Interfaces
Volume8
Issue number7
DOIs
Publication statusPublished - 2016 Feb 24

Keywords

  • adhesion
  • core-shell fibers
  • nano-/microfibers
  • self-healing
  • solution blowing

ASJC Scopus subject areas

  • Materials Science(all)

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