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Studies of Alkoxysilane Hydrolysis and Condensation by Fourier-transform Infrared Spectroscopy with a Cylindrical Internal-reflection Cell by D.E. Lerden; R.S. Shreedhara Murthy; J.B. Atwater; J.P. Blitz is a Chemistry article available to read on EtoBox.

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The relative concentrations of unhydrolyzed and hydrolyzed forms of (3-trimethoxysilyl)propyloctadecyldimethylammonium chloride (SiQAC) were determined in aqueous solutions as functions of pH and time. Subtraction of the concentrations of these two forms of SiQAC from the total concentration of SiQAC was assumed to give the concentration of the "condensed" form of SiQAC irrespective of its extent of oligomerization. The silane, SiQAC, is used to modify a variety of surfaces to impart antimicrobial properties. Knowledge of the speciation of SiQAC is required to understand its effect on the efficiency and durability of such chemically modified surfaces. The cylindrical internalreflection/FTIR spectroscopy was also used to determine the rate constants for hydrolysis and condensation of monomethoxytrimethylsilane (hITMS) in 10% (v/v) water/ acetone medium as a function of hydrogen-ion concentration. The hydrolysis of MTMS was found to be first order in both silane and water concentrations. The condensation of trimethylsilanol to form hexamethyldisiloxane was second order in silanol concentration.

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Author

D.E. Lerden; R.S. Shreedhara Murthy; J.B. Atwater; J.P. Blitz

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

1987

Language

EN

Field

Chemistry (Physical Sciences)