M. Biscoglio et al., TEMPORARY WATER-IN-OIL MICROEMULSION IN THE SYSTEM PENTANOL OCTYLTRIMETHOXYSILANE AND WATER AT PH-13, Colloids and surfaces. A, Physicochemical and engineering aspects, 104(1), 1995, pp. 41-51
Temporary water-in-oil (W/O) microemulsions were prepared from pentano
l, octyltrimethoxysilane and water set to pH 13 with sodium hydroxide.
Octyltrimethoxysilane microemulsions were formed at less than 70 wt.%
. The stability time was rapidly reduced when the water content was in
creased in excess of the amount needed for complete condensation of th
e silicon compound. NMR data showed the octyltrisiloxane to be the dom
inant compound of the silicon structures at higher water concentration
. The separated phase consisted, not of a water rich phase as expected
for a W/O microemulsion, but of a three-dimensional octyltrisiloxane
with minute amounts of water and pentanol. Infrared spectra of the dri
ed siloxane showed no presence of hydroxy groups, indicating a complet
e condensation.