Journal of Materials Research


A silicon-29 NMR study of the structural intermediates in low pH sol-gel reactions

L. W. Keltsa1 and N. J. Armstronga1

a1 Corporate Research Laboratories, Eastman Kodak Company, Rochester, New York 14650


Silicon-29 NMR is used to study the structural intermediates in tetramethyl and tetraethyl orthosilicate (TMOS and TEOS) low pH sol-gel reactions. Differences in the number of compact ring structures are related to differences in gel times. Reactions are followed at various silicon: water: acid molar ratios.

(Received June 02 1988)

(Accepted November 21 1988)