Fracture behavior of a self-healing, toughened epoxy adhesive

Henghua Jin, Gina M. Miller, Stephen J. Pety, Anthony S. Griffin, Dylan S. Stradley, Dennis Roach, Nancy R. Sottos, Scott R. White

Research output: Contribution to journalArticlepeer-review

Abstract

A self-healing, toughened epoxy adhesive is demonstrated based on a commercial structural adhesive film. Self-healing is achieved via embedded microcapsules containing dicyclopentadiene monomer and solid particles of bis(tricyclohexylphosphine)-benzylidine ruthenium (IV) dichloride (Grubbs') catalyst. Recovery of fracture toughness is assessed through fracture testing of width tapered double cantilever beam (WTDCB) specimens. Healing efficiencies as high as 58% were achieved for 6.6 wt% DCPD microcapsules and 10 mg Grubbs' catalyst. However, virgin fracture toughness is reduced with the addition of ca. 117 μm diameter microcapsules as a result of suppression of the damage zone as revealed by transmission optical micrographs. The uniform dispersal of microcapsules throughout a rubber toughened epoxy adhesive formulated using EPON 828, piperidine and CTBN alleviated the suppression effect and demonstrated retention of virgin fracture toughness of adhesives.

Original languageEnglish (US)
Pages (from-to)157-165
Number of pages9
JournalInternational Journal of Adhesion and Adhesives
Volume44
DOIs
StatePublished - 2013

Keywords

  • Epoxy adhesive
  • Fracture toughness
  • Microcapsule
  • Self-healing

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Biomaterials
  • Polymers and Plastics

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