Fracture and fatigue response of a self-healing epoxy adhesive

Henghua Jin, Gina M. Miller, Nancy R. Sottos, Scott R. White

Research output: Contribution to journalArticlepeer-review

Abstract

A self-healing epoxy adhesive for bonding steel substrates is demonstrated using encapsulated dicyclopentadiene (DCPD) monomer and bis(tricyclohexylphosphine)benzylidine ruthenium (IV) dichloride (Grubbs' first generation) catalyst particles dispersed in a thin epoxy matrix. Both quasi-static fracture and fatigue performance are evaluated using the width-tapered-double-cantilever-beam specimen geometry. Recovery of 56% of the original fracture toughness under quasi-static fracture conditions occurs after 24 h healing at room temperature conditions. Complete crack arrest is demonstrated for fatigue test conditions that render neat resin and control samples failed. Inspection of fracture surfaces by electron microscopy reveals evidence of polymerized DCPD after healing. These results are the first mechanical assessment of self-healing for thin (ca. 360 μm) films typical of adhesives applications.

Original languageEnglish (US)
Pages (from-to)1628-1634
Number of pages7
JournalPolymer
Volume52
Issue number7
DOIs
StatePublished - Mar 23 2011

Keywords

  • Adhesives
  • Epoxy
  • Self-healing

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

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