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

doi:10.1016/j.ijadhadh.2013.02.015

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 journal › Article › peer-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 language	English (US)
Pages (from-to)	157-165
Number of pages	9
Journal	International Journal of Adhesion and Adhesives
Volume	44
DOIs	https://doi.org/10.1016/j.ijadhadh.2013.02.015
State	Published - 2013

Keywords

Epoxy adhesive
Fracture toughness
Microcapsule
Self-healing

ASJC Scopus subject areas

General Chemical Engineering
Biomaterials
Polymers and Plastics

Online availability

10.1016/j.ijadhadh.2013.02.015

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@article{86d427843bb94fcdbff9a3cffb1dc1e3,

title = "Fracture behavior of a self-healing, toughened epoxy adhesive",

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.",

keywords = "Epoxy adhesive, Fracture toughness, Microcapsule, Self-healing",

author = "Henghua Jin and Miller, {Gina M.} and Pety, {Stephen J.} and Griffin, {Anthony S.} and Stradley, {Dylan S.} and Dennis Roach and Sottos, {Nancy R.} and White, {Scott R.}",

note = "Funding Information: The authors acknowledge funding support from the National Science Foundation (Grant # CMS 05-27965 ) and Sandia National Laboratories ( BPO 378467 ). Stephen Pety was supported in part by an NDSEG fellowship, which is sponsored by the Department of Defense . In addition, the authors greatly acknowledge Dr. Chris Mangun and Dr. Mary M. Caruso for technical help and discussion. Manufacturing test specimens was accomplished with the help of Kent Elam in the Aerospace Engineering Machine Shop. Fracture testing was completed at the Advanced Materials Testing and Engineering Lab, with assistance of Peter Kurath, Gavin Horn and Rick Rottet. Electron microscopy was performed in the Imaging Technology Group of the Beckman Institute for Advanced Science and Technology, with the assistance of Scott Robinson. ",

year = "2013",

doi = "10.1016/j.ijadhadh.2013.02.015",

language = "English (US)",

volume = "44",

pages = "157--165",

journal = "International Journal of Adhesion and Adhesives",

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publisher = "Elsevier Ltd",

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AU - Jin, Henghua

AU - Miller, Gina M.

AU - Pety, Stephen J.

AU - Griffin, Anthony S.

AU - Stradley, Dylan S.

AU - Roach, Dennis

AU - Sottos, Nancy R.

AU - White, Scott R.

N1 - Funding Information: The authors acknowledge funding support from the National Science Foundation (Grant # CMS 05-27965 ) and Sandia National Laboratories ( BPO 378467 ). Stephen Pety was supported in part by an NDSEG fellowship, which is sponsored by the Department of Defense . In addition, the authors greatly acknowledge Dr. Chris Mangun and Dr. Mary M. Caruso for technical help and discussion. Manufacturing test specimens was accomplished with the help of Kent Elam in the Aerospace Engineering Machine Shop. Fracture testing was completed at the Advanced Materials Testing and Engineering Lab, with assistance of Peter Kurath, Gavin Horn and Rick Rottet. Electron microscopy was performed in the Imaging Technology Group of the Beckman Institute for Advanced Science and Technology, with the assistance of Scott Robinson.

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

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KW - Fracture toughness

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KW - Self-healing

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ER -

Fracture behavior of a self-healing, toughened epoxy adhesive

Abstract

Keywords

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