Microencapsulation of self-healing agents containing a fluorescent dye
- Authors
- Noh, H. H.; Lee, J. K.
- Issue Date
- Jan-2013
- Publisher
- BUDAPEST UNIV TECHNOL & ECON
- Keywords
- coatings; self-healing; microencapsulation; fluorescent dye
- Citation
- EXPRESS POLYMER LETTERS, v.7, no.1, pp 88 - 94
- Pages
- 7
- Journal Title
- EXPRESS POLYMER LETTERS
- Volume
- 7
- Number
- 1
- Start Page
- 88
- End Page
- 94
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/28128
- DOI
- 10.3144/expresspolymlett.2013.8
- ISSN
- 1788-618X
- Abstract
- Two different self-healing agent candidates, endo-dicyclopentadiene (endo-DCPD) and 5-ethylidene-2-norbornene (ENB), containing a fluorescent dye surrounded by a melamine-urea-formaldehyde (MUF) shell were microencapsulated by in-situ polymerization and the resulting microcapsules were characterized in this work. The microcapsules showed a narrow size distribution with a spherical shape and rough outer and smooth inner surfaces for both healing agent systems. Shell thicknesses of the microcapsules were similar to 880 +/- 80 nm for endo-DCPD and similar to 620 +/- 60 nm for ENB. The incorporation of a fluorescent dye as tracer into self-healing agents did not disturb the formation of microcapsules. The release of self-healing liquid into the induced crack from ruptured microcapsules in an epoxy coating layer was observed using a fluorescence microscopy. The use of a fluorescent dye is very effective in the observation of a damage site.
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