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In situ poly(urea-formaldehyde) microencapsulation of dicyclopentadiene

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Title: In situ poly(urea-formaldehyde) microencapsulation of dicyclopentadiene
Author(s): Brown, Eric N.; Kessler, Michael R.; Sottos, Nancy R.; White, Scott R.
Subject(s): smart materials experimental solid mechanics fracture materials processing micromechanics
Abstract: Microencapsulated healing agents that possess adequate strength, long shelf-life, and excellent bonding to the host material are required for self-healing materials. Ureaformaldehyde microcapsules containing dicyclopentadiene were prepared by in situ polymerization in an oil-in-water emulsion that meet these requirements for self-healing epoxy. Microcapsules of 10-1000 µm in diameter were produced by appropriate selection of agitation rate in the range of 200-2000 rpm. A linear relation exists between log(mean diameter) and log(agitation rate). Surface morphology and shell wall thickness were investigated by optical and electron microscopy. Microcapsules are composed of a smooth 160-220 nm inner membrane and a rough, porous outer surface of agglomerated urea-formaldehyde nanoparticles. Surface morphology is influenced by pH of the reacting emulsion and interfacial surface area at the core-water interface. High yields (80-90%) of a free flowing powder of spherical microcapsules were produced with a fill content of 83-92 wt% as determined by CHN analysis.
Issue Date: 2003-02
Publisher: Department of Theoretical and Applied Mechanics (UIUC)
Citation Info: Published as: E. N. Brown, M. R. Kessler, N. R. Sottos, and S. R. White. In situ poly(urea-formaldehyde) microencapsulation of dicyclopentadiene. Journal of Microencapsulation, Vol. 20, No.6, 2003, pp 719-730. DOI: 10.1080/0265204031000154160. Copyright 2003 Taylor & Francis Group Ltd.
Series/Report: TAM Reports 1014
Genre: Technical Report
Type: Text
Language: English
URI: http://hdl.handle.net/2142/281
ISSN: 0073-5264
Publication Status: published or submitted for publication
Peer Reviewed: is peer reviewed
Date Available in IDEALS: 2007-03-08
 

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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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