TEMPORARY WATER-IN-OIL MICROEMULSION IN THE SYSTEM PENTANOL OCTYLTRIMETHOXYSILANE AND WATER AT PH-13

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.