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Microcapsule induced toughening in a self-healing polymer composite

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Title: Microcapsule induced toughening in a self-healing polymer composite
Author(s): Brown, Eric N.; White, Scott R.; Sottos, Nancy R.
Abstract: Microencapsulated dicyclopentadiene (DCPD) healing agent and Grubbs' Ru catalyst are incorporated into an epoxy matrix to produce a polymer composite capable of selfhealing. The fracture toughness and healing efficiency of this composite are measured using a tapered double-cantilever beam (TDCB) specimen. Both the virgin and healed fracture toughness depend strongly on the size and concentration of microcapsules added to the epoxy. Fracture of the neat epoxy is brittle, exhibiting a mirror fracture surface. Addition of DCPD-filled urea-formaldehyde (UF) microcapsules yields up to 127% increase in fracture toughness and induces a change in the fracture plane morphology to hackle markings. The fracture toughness of epoxy with embedded microcapsules is much greater than epoxy samples with similar concentrations of silica microspheres or solid UF polymer particles. The increased toughening associated with fluid-filled microcapsules is attributed to increased hackle markings as well as subsurface microcracking not observed for solid particle fillers.
Issue Date: 2003-02
Publisher: Department of Theoretical and Applied Mechanics (UIUC)
Series/Report: TAM Reports 1015
Genre: Technical ReportArticle
Type: Text
Language: English
URI: http://hdl.handle.net/2142/283
ISSN: 0073-5264
Publication Status: published or submitted for publication
Peer Reviewed: is peer reviewed
Date Available in IDEALS: 2007-03-08
Is Version Of: Published as: E. N. Brown, S. R. White, and N. R. Sottos. Microcapsule induced toughening in a self-healing polymer composite. Journal of Materials Science, Vol. 35, No. 5, 2004, pp. 1703-1710. DOI: 10.1023/B:JMSC.0000016173.73733.dc. Copyright 2004 Springer Netherlands
 

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  • Theoretical and Applied Mechanics (TAM) Technical Reports
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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