Korea-Australia Rheology Journal

The Korean Society of Rheology (한국유변학회)
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Material and rheological properties of (glycidoxypropyl) trimethoxysilane modified colloidal silica coatings

  • Kang Hyun Uk (Department of Chemical and Biological Engineering, Korea University) ;
  • Park Jung Kook (Department of Environmental System Engineering, Korea University) ;
  • Kim Sung Hyun (Department of Chemical and Biological Engineering, Korea University)
  • Published : 2004.12.01
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Abstract

Colloidal coating solution was prepared to enhance the hydrophilic property of the film surface. Water and ethanol were used as the dispersion media and (glycidoxypropyl) trimethoxysilane (GPS) as a binder in the colloidal silica coatings. Ethylene diamine was added to the colloidal silica solution as the curing agent. The colloidal silica solution was regarded as a hard-sphere suspension model with low volume fraction of the silica particles. Rheological properties of the silica suspensions modified with GPS have been investigated as a function of pH and concentration. The acidic solution showed high viscosity change by fast hydrolysis reaction and adsorption of the organic binders on the surface of silica particles. However, the hydrolysis was slow at the basic condition and the binders combined with themselves by condensation. The viscosity change was smallest at pH 7. The viscosity increased with the curing time after adding ethylenediamine, and the increase of viscosity at low pH was higher than that at high pH. The hydrophilic properties of the coating film were investigated by the contact angle of water and film surface. The smallest contact angle was shown under the strong acidic condition of pH 2.

Keywords

References

  1. Batchelor, G.K., 1977, The effect of Brownian motion on the bulk stress in a suspension of spherical particles, J. Fluid Mech. 83, 97 https://doi.org/10.1017/S0022112077001062
  2. Blizzard, J.D. and L.J. Cottington, 1995, U.S. Patent 5, 403,535
  3. Chu, L., M.W. Daniels and L.F. Francis, 1997, Use of (Gly-cidoxypropyl) trimethoxysilane as a binder in colloidal silica coatings, Chem. Mater. 9, 2577 https://doi.org/10.1021/cm9702880
  4. Daniels, M.W and L.F. Francis, 1998, Silane adsorption behav-ior, microstructure, and properties of glycidoxypropyltri-methoxysilane-modified colloidal silica coatings, J. Colloid Interface Science 205, 191 https://doi.org/10.1006/jcis.1998.5671
  5. de Kruif, CG., E.M.F. van Iersel, A.Vrij and W.B. Russel, 1985, Hard sphere colloidal dispersions : Viscosity as a function of shear rate and volume fraction, J. Chem. Phys. 83, 4717 https://doi.org/10.1063/1.448997
  6. Ikuta, N, Z. Maekawa, H. Hamada, H. Ichihashi, E. Nishio and I. Abe, 1990, Controlled interphases in composite materials: Proc. of the Third Int. Conf. on Composite Interfaces, 757
  7. Jones, D. A. R., B. Leary and D.V. Boger, 1991, The reology of concentrated colloidal suspension of hard spheres, J. Colloid Interface Science 147, 479 https://doi.org/10.1016/0021-9797(91)90182-8
  8. Kim, Chongyoup, 2001, Migration in concentrated suspension of spherical particles dispersed in polymer solution, Korea-Aus-tralia Rheology J. 13, 19
  9. Martinson, R.E., J.J. Stofko, M. Sarkar, S.T. Hedrick and W.K. Larson, 1995, U.S. Patent 5, 445, 866
  10. Plueddemann, E.P., 1982, Silane Coupling Agents, Plenum Press, New York
  11. Pohl, E.R. and Osterholtz, F.D., 1985, Molecular characterization of composite interfaces, Plenum Press, New York
  12. Van Ooij, W.J., C. Golden, R.D. Boston and E.J. Woo, 1993, U.S. Patent 5, 204, 219