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Preparation of Microcapsules Containing Water Droplets Stabilized with Solid Powder and Application to Blowing Agent

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DOI: 10.4236/msa.2014.51003    3,247 Downloads   4,778 Views   Citations

ABSTRACT

We have tried to prepare the microcapsules containing water droplets stabilized with solid powder by utilizing the (W/O)/W emulsion. The water droplets as core material were stabilized in the monomer droplets with titanium dioxide (TiO2) as a particulate surfactant. Before adding the TiO2 powder into the monomer phase, the powder was modified with triethoxyvinylsilane to adjust the degree of hydrophobicity and to promote adhesion on the interface between the inner water phase and the monomer phase in the (W/O) emulsion. It was investigated how the degree of hydrophobicity of the TiO2 powder affected the stability of water droplets in the (W/O) emulsion and the (W/O) droplets in the (W/O)/W emulsion. Moreover, the microcapsule diameters were measured before and after the expansion operation where the water droplets microencapsulated were applied as a blowing agent. The expansion ratio was increased with increase in the stability of the water droplets and the amount of water microencapsulated.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

D. Nakamura, H. Yokoyama, Y. Taguchi and M. Tanaka, "Preparation of Microcapsules Containing Water Droplets Stabilized with Solid Powder and Application to Blowing Agent," Materials Sciences and Applications, Vol. 5 No. 1, 2014, pp. 20-26. doi: 10.4236/msa.2014.51003.

References

[1] T. Kondo, “Saishin Maikurokapuseruka Gijutsu (Microencapsulation Technique) (in Japanese),” ETS, Tokyo, 1967.
[2] M. Tanaka, “Key Point of Preparation of Nano/Microcapsules,” Techno System Publishing Co. Ltd., Tokyo, 2008.
[3] J. Pallay and H. Berghmans, “Water-blown Expandable Polystyrene. Improvement of the Compatibility of the Water Carrier with the Polystyrene Matrix by In Situ Grafting PartⅠ. Mechanism of Free Radical Grafting,” Cellular Polymers, Vol. 21, No. 1, 2002, pp. 1-18.
[4] J. Pallay and H. Berghmans, “Water-blown Expandable Polystyrene. Improvement of the Compatibility of the Water Carrier with the Polystyrene Matrix by In Situ Grafting PartⅡ. Influence of Compatibilization on the Foam Quality,” Cellular Polymers, Vol. 21, No. 1, 2002, pp. 19-33.
[5] J. Pallay, P. Kelemen, H. Berghmans and D. V. Dommelen, “Expansion of Polystyrene Using Water as the Blowing Agent,” Macromolecular Materials and Engineering, Vol. 275, No. 1, 2000, pp. 18-25.
http://dx.doi.org/10.1002/(SICI)1439-2054(20000201)275:1<18::AID-MAME18>3.0.CO;2-3
[6] J. Pallay, S. Pallayova and H. Berghmans, “Expansion of Polystyrene Using Water as the Blowing Agent,” Journal of Cellular Pastics, Vol. 43, No. 4-5, 2007, pp. 371-383.
http://dx.doi.org/10.1177/0021955X07079208
[7] M. Tanaka, K. Hashimoto and K. Nakada, “Effect of Solid Powders on Stability of Emulsion,” Oil Chemistry, Vol. 28, No. 7, 1979, pp. 491-496.
[8] E. O’shima and M. Tanaka, “Effect of Solid Powders on Stability of Suspension Polymerization of Styrene,” Kagaku Kogaku Ronbunshu, Vol. 8, No. 2, 1982, pp. 188193. http://dx.doi.org/10.1252/kakoronbunshu.8.188
[9] M. Tanaka and K. Hayashi, “Preparation of Polystyrene Particles Coated with Ferrite Powder by Suspension Polymerization,” Kagaku Kogaku Ronbunshu, Vol. 15, No. 6, 1989, pp. 1144-1152.
http://dx.doi.org/10.1252/kakoronbunshu.15.1144
[10] M. Tanaka and K. Hayashi, “Preparation of Polymer Particles Covered with Ferrite Powder by Suspension Polymerization: Effect of Wettability of Powder on Composite Particle Size Distribution,” Journal of Material Science, Vol. 25, 1990, pp. 987-991.
[11] M. Tanaka and K. Hayashi, “Preparation of Polystyrene Particles with Carbon Black Covered Uniformly with Ferrite Powder by Suspension Polymerization,” Journal of the Japan Society of Colour Material, Vol. 63, No. 6, 1990, pp. 321-329.
[12] M. Tanaka, A. Saito, K. Hosogai and I. Kimura, “Preparation of Fine Polymer Particles Coated Uniformly with Magnetite Powder by Suspension Polymerization,” Kagaku Kogaku Ronbunshu, Vol. 18, No. 3, 1992, pp. 330-337.
http://dx.doi.org/10.1252/kakoronbunshu.18.330
[13] M. Tanaka, K. Hosogai, T. Yuda, I. Kimura and N. Saito, “Preparation of Composite Particles Composed of Polystyrene and Carbon Silicide by Suspension Polymerization,” Journal of the Japan Society of Colour Material, Vol. 65, No. 8, 1992, pp. 484-491.
[14] E. O’shima and M. Tanaka, “Coalescence and Breakup of Droplets in Suspension Polymerization of Styrene,” Kagaku Kogaku Ronbunshu, Vol. 8, No. 1, 1982, pp. 86-90. http://dx.doi.org/10.1252/kakoronbunshu.8.86
[15] M. Tanaka and E. O’shima, “Effect of Viscosity of Continuous Phase on Stability of Droplets in Suspension Polymerization of Styrene,” Kagaku Kogaku Ronbunshu, Vol. 8, No. 6, 1982, pp. 734-738.
http://dx.doi.org/10.1252/kakoronbunshu.8.699

  
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