Microencapsulation of imidazole curing agents by spray-drying method using W/O emulsion

Imidazoles were microencapsulated for the latent curing of the epoxy resin— imidazole system. Using polycaprolactone as the wall material, the microcapsules were formed by spray‐drying method using water/oil (W/O) emulsion. Poly(vinyl alcohol) was used as the emulsion stabilizer. The imidazoles used...

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Bibliographic Details
Published in:Journal of applied polymer science 2012-11, Vol.126 (S2), p.E108-E115
Main Authors: Shin, Min Jae, Kim, Jin Gon, Shin, Jae Sup
Format: Article
Language:English
Subjects:
Curing
curing of polymers
differential scanning calorimetry
Emulsions
Epoxy resins
Ethyl alcohol
Imidazole
Materials science
microencapsulation
Polymers
Reproduction
Shelf life
Walls
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Summary:Imidazoles were microencapsulated for the latent curing of the epoxy resin— imidazole system. Using polycaprolactone as the wall material, the microcapsules were formed by spray‐drying method using water/oil (W/O) emulsion. Poly(vinyl alcohol) was used as the emulsion stabilizer. The imidazoles used in this study were imidazole and 2‐methylimidazole. The amount of imidazoles in the microcapsule was measured using elemental analysis. The permeability of the microcapsules was measured in ethanol, and the shelf life of the microcapsules was also studied for the epoxy resin. The curing behavior of these microcapsules to epoxy resin was examined using a differential scanning calorimeter. In the curing reaction, the microcapsule of imidazoles exhibited delayed kinetic behaviors compared to pure imidazoles. And the curing times were estimated at 150 and 180°C using an indentation method. These microcapsules of imidazoles exhibited a long shelf life. When comparing the previous method in which simple dichloromethane solution was used for spray‐drying, finer microcapsules were formed using the W/O emulsion. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
ISSN:0021-8995
1097-4628
DOI:10.1002/app.35490