Material and rheological properties of (glycidoxypropyl) trimethoxysilane modified colloidal silica coatings

Hyun Uk Kang; Jung Kook Park; Sung Hyun Kim

Korea-Australia Rheology Journal, Vol.16, No.4, 175-182, December, 2004

Export Citation

Material and rheological properties of (glycidoxypropyl) trimethoxysilane modified colloidal silica coatings

Hyun Uk Kang, Jung Kook Park¹, and Sung Hyun Kim^†

Department of Chemical and Biological Engineering, Korea University, Seoul 136-701, Korea
¹Department of Environmental System Engineering, Korea University, Seoul 136-701, Korea

E-mail:

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:modified silica coating;sol-gel method;hydrophilic property

[References]

Batchelor GK, J. Fluid Mech., 83, 97 (1977)
Blizzard JD, Cottington LJ, U.S. Patent 5,403,535 (1995)
Chu L, Daniels MW, Francis LF, Chem. Mater., 9, 2577 (1997)
Daniels MW, Francis LF, J. Colloid Interface Sci., 205(1), 191 (1998)
deKruif CG, vanIersel EMF, Vrij A, Russel WB, J. Chem. Phys., 83, 4717 (1985)
Ikuta N, Maekawa Z, Hamada H, Ichihashi H, Nishio E, Abe I, Controlled interphases in composite materials : Proc. of the Third Int. Conf. on Composite Interfaces, 757 (1990)
Jones DAR, Leary B, Boger DV, J. Colloid Interface Sci., 147, 479 (1991)
Kim C, Korea-Aust. Rheol. J., 13(1), 19 (2001)
Martinson RE, Stofko JJ, Sarkar M, Hedrick ST, Larson WK, U.S. Patent 5, 445, 866. (1995)
Plueddemann EP, Silane Coupling Agents, Plenum Press, New York. (1982)
Pohl ER, Osterholtz FD, Molecular characterization of composite interfaces, Plenum Press, New York. (1985)
VanOoij WJ, Golden C, Boston RD, Woo EJ, U.S. Patent 5, 204, 219. (1993)

[Related Articles]

[1] Batchelor GK, J. Fluid Mech., 83, 97 (1977)

[2] Blizzard JD, Cottington LJ, U.S. Patent 5,403,535 (1995)

[3] Chu L, Daniels MW, Francis LF, Chem. Mater., 9, 2577 (1997)

[4] Daniels MW, Francis LF, J. Colloid Interface Sci., 205(1), 191 (1998)

[5] deKruif CG, vanIersel EMF, Vrij A, Russel WB, J. Chem. Phys., 83, 4717 (1985)

[6] Ikuta N, Maekawa Z, Hamada H, Ichihashi H, Nishio E, Abe I, Controlled interphases in composite materials : Proc. of the Third Int. Conf. on Composite Interfaces, 757 (1990)

[7] Jones DAR, Leary B, Boger DV, J. Colloid Interface Sci., 147, 479 (1991)

[8] Kim C, Korea-Aust. Rheol. J., 13(1), 19 (2001)

[9] Martinson RE, Stofko JJ, Sarkar M, Hedrick ST, Larson WK, U.S. Patent 5, 445, 866. (1995)

[10] Plueddemann EP, Silane Coupling Agents, Plenum Press, New York. (1982)

[11] Pohl ER, Osterholtz FD, Molecular characterization of composite interfaces, Plenum Press, New York. (1985)

[12] VanOoij WJ, Golden C, Boston RD, Woo EJ, U.S. Patent 5, 204, 219. (1993)