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Received July 2, 2001
Accepted September 13, 2001
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Rheological Analysis of the Gelation Behavior of Tetraethylorthosilane/ Vinyltriethoxysilane Hybrid Solutions
Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Daejeon 305-701, Korea
Korean Journal of Chemical Engineering, January 2002, 19(1), 190-196(7), 10.1007/BF02706894
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Abstract
The gelation behavior of tetraethylorthosilane (TEOS) sol in the presence of a silane coupling agent vinyltriethoxysilane (VTES) was investigated experimentally. Specifically, the gel time and gel structure were analyzed by the rheological multiwave test of Fourier transform mechanical spectroscopy (FTMS) for the mixtures of TEOS/ VTES with various molar ratios at different temperatures. Gelation was accomplished through the sol-gel reactions of the silicon alkoxide TEOS in aqueous acidic solution. The results showed that, at elevated temperatures, the gel point_x000D_
was scattered and obscured by the noise in low frequencies owing to the enhanced thermal agitations. In this case, the statistical method was used to find the exact gel time. The activation energy of gelation and the gel exponent ranged from 25 to 30 kJ/mol and from 0.581 to 0.771, respectively, depending on the TEOS/VTES composition. The fractal dimension was estimated from the gel exponent and indicated the gel structure and that the TEOS/VTES solutions formed a relatively open and coarse gel structure.
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References
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Eu YJ, Kim DJ, Bae BS, J. Sol-Gel Sci. Tech., 13, 409 (1998)
Flory PJ, "Principles of Polymer Chemistry," Cornell University Press, Ithaca, NY (1953)
Halley PJ, Mackay ME, Polym. Eng. Sci., 36(5), 593 (1996)
Hench LL, West JK, Chem. Rev., 90, 33 (1990)
Hodgson DF, Amis EJ, J. Non-Cryst. Solids, 131, 913 (1991)
Holly EE, Venkatarman SK, Chambon F, Winter HH, J. Non-Newton. Fluid Mech., 27, 17 (1988)
In M, Prudhomme RK, Rheol. Acta, 32, 556 (1993)
Khan SA, J. Non-Cryst. Solids, 110, 153 (1989)
Kim SY, Choi DG, Yang SM, HWAHAK KONGHAK, accepted (2001)
Lee SY, Lee JD, Yang SM, J. Mater. Sci., 34(6), 1233 (1999)
Mours M, Winter HH, Macromolecules, 29(22), 7221 (1996)
Muthukumar M, Macromolecules, 22, 4658 (1989)
Oh MH, So JH, Lee JD, Yang SM, Korean J. Chem. Eng., 16(4), 532 (1999)
Oh MH, So JH, Yang SM, J. Colloid Interface Sci., 216(2), 320 (1999)
Orcel G, Hench LL, J. Non-Cryst. Solids, 105, 223 (1998)
Power DJ, Rodd AB, Paterson L, Boger DV, J. Rheol., 42(5), 1021 (1998)
Raghavan SR, Chen LA, Mcdowell C, Khan SA, Hwang R, White S, Polymer, 37(26), 5869 (1996)
