Self-healing of nanofiber-based composites in the course of stretching

Min Wook Lee, Soumyadip Sett, Sam S. Yoon, Alexander L. Yarin

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Here we aim to elucidate the self-healing mechanisms in composites with embedded solution-blown nanofibers containing separate reservoirs of epoxy resin and hardener in their cores. In tensile tests of such composite materials with the resin- and hardener-containing solution-blown nanofibers embedded in a polymer matrix, it is shown that the fibers can be ruptured by stretching, thereby releasing the epoxy resin and hardener. Given a resting (or holding) period of 1–2 h, such materials can experience a restoration or even enhancement of stiffness in subsequent stretching, thereby displaying self-healing properties. In two model macroscopic experiments with a single crack tip, conducted in the Appendix with the aim to elucidate the self-healing mechanism, the epoxy resin and hardener released into the tip are shown to react with each other, resulting in a cured and hardened epoxy that heals the crack tip.

Original languageEnglish
Pages (from-to)180-188
Number of pages9
JournalPolymer
Volume103
DOIs
Publication statusPublished - 2016 Oct 26

Keywords

  • Composite
  • Nanofiber
  • Self-healing

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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