Preparation of Oil Core/Polyelectrolyte Shell Microcapsules by a Coacervation Method

Abstract:

Microcapsules with triallylamine-containing core surrounded by polyelectrolyte shell of controlled thickness were prepared via layer-bylayer assembly technology. First, isocyanate end-capped polyurethane was synthesized through the reaction of isophorone diisocyanate and poly(1,4- butylene adipate). Then, polyurea microcapsules containing triallylamine were prepared by the interfacial polymerization with branched polyethylenimine (PEI) as the water-phase macro-monomer and the prepared isocyanate end-capped polyurethane as the oil-phase macromonomer. Finally, stable weak polyelectrolyte microcapsules were prepared by assembly of poly(acrylic acid)(PAA) and branehed PEI to build up polyelectrolyte multi-layers, and this was followed by glutaraldehyde mediated cross-linking to further increase the mechanical strength of the final capsules. Results showed that the obtained microcapsules were narrowly distributed in size and the mean diameter could be adjusted. This kind of capsule might be used to construct pressure-sensitive materials.

• Periodical: Materials Science Forum (Volumes 675-677)
• Pages: 1109-1112
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.675-677.1109
• Online since: February 2011
• Authors: Wu Kun Fan, Wen Zhao, Zhong Xiao Li
• Keywords: Coacervation, Cross-Linking, Microcapsule, Polyelectrolyte

References

[1] Simon Benita: Microencapsulation: Methods and Industrial Applications, (Marcel Decker Inc., U. S. A. 1996).

[2] W. J. Tong, C. Y. Gao: Polymers for Advanced Technology, Vol. 16 (2007), p.827.

[3] J. Jung, M. Perrut: J. Supercrit. Fluids, Vol. 20 (2001), p.179.

[4] B.M. Discher, et al.: Science, Vol. 284 (1999), p.1143.