Effects of Protective Colloids on the Formation of Polyurea Microcapsules

  • Lee, Eung-Min (Daewoo International/ISM) ;
  • Kim, Hea-In (Organic Material System Engineering, Pusan National University) ;
  • Park, Soo-Min (Organic Material System Engineering, Pusan National University)
  • Published : 2007.10.27

Abstract

Cypermethrin-containing polyurea microcapsules were prepared by interfacial polymerization using aromatic 2,4-toluene diisocyanate(TDI) and Ethylene diamine(EDA) as wall forming materials. The effects of the protective colloids of polyvinylalcohol(PVA) and gelatin were investigated through experimentation. The mean size of the polyurea microcapsules was smaller and the surface morphology of the PVA was much smoother than gelatin. In addition the release behavior was much more controlled and better sustained. As the concentration of protective colloid increased, the wall membrane of the polyurea microcapsules became more stable, the thermal stability of the wall membrane increased, the mean particle size became smaller, and the particle distribution was more uniform. The release behavior of the core material changed according to the concentration. As the gelatin concentration was increased, a more controlled and sustained release behavior was observed. However, in the case of PVA, the increase of PVA concentration lead to a more rapid release rate.

Keywords

References

  1. K. Hong, S. Park, Melamine Resin Microcapsules Containing Fragrant Oil, Materials Chemistry and Physics, 58(2), 128-131(1999) https://doi.org/10.1016/S0254-0584(98)00263-6
  2. K. Hirech, S. Payan, G. Carnelle, L. Brujes and J. Legrand, Microencapsulation of an insecticide by interfacial polymerisation, Powder Technology, 130, 324-330(2003) https://doi.org/10.1016/S0032-5910(02)00211-5
  3. Peihong Ni, Mingzu, Nianxi Yan, Effect of operating variables and monomers on the formation of polyurea microcapsules, Journal of Membrane Science, 103, 51-55(1995) https://doi.org/10.1016/0376-7388(94)00306-J
  4. S. K. Yadav, Kartic C. Khilar and A. K. Suresh, Release rates from semi-crystalline polymer microcapsules formed by interfacial polycondensation, Journal of Membrane Science, 125(2), 213-218(1997) https://doi.org/10.1016/S0376-7388(96)00171-8
  5. D. Saihi, I. Vroman, S. Giraud and S. Bourbigot, Microencapsulation of ammonium phosphate with a polyurethane shell part I: Coacervation technique, Reactive and Functional Polymers, 64(3), 127-138(2005) https://doi.org/10.1016/j.reactfunctpolym.2005.05.004
  6. Nihal Sarier and Emel Onder, The manufacture of microencapsulated phase change materials suitable for the design of thermally enhanced fabrics, Thermochimica Acta, 452(2), 149-160(2007) https://doi.org/10.1016/j.tca.2006.08.002
  7. J. Kubota, N. Hirabayashi, A. Kato and H. Yoshizawa, Microreactor utilized preparation of monodispersed polymeric microcapsules by urea/formaldehyde phase separation method, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 302, 320-325(2007) https://doi.org/10.1016/j.colsurfa.2007.02.062
  8. K. Hong, S. Park, Preparation and Charaterization of Polyurea Microcapsules with Different Diamines, Materials Research Bulletin, 34(6), 963-969(1999) https://doi.org/10.1016/S0025-5408(99)00088-4
  9. K. Hong, S. Park, Preparation of Polyurea Microcapsules with Different Composition Ratios, Materials Science and Engineering, A272(2), 418-421(1999)
  10. K. Hong, S. Park, Morphologies and Release Behavior of Polyurea Microcapsules from Different Polyisocyanates, Journal of Materials Science, 34(1), 3161-3164(1999) https://doi.org/10.1023/A:1004621620955
  11. S. K. Yadav, K. C. Khilar, A. K. Suresh, Preparation of Polyurea Microcapsules containing Ovalbumin, AIChE Journal, 42(9), 2616- 2626(1996) https://doi.org/10.1002/aic.690420922