Phase studies of long-chain alkanol complexes with alkylammonium layer silicates

Measurements of basal spacings ofn-tetradecylammonium-n-tetradecanol complexes of beidellite and montmorillonite in a wide range of tetradecanol concentrations have been carried out. Three different intercalate phases have been established at room temperature. In definite concentration ranges two of the phases coexist. These miscibility gaps disappear when the temperature is increased above 80°C. They appear again at cooling. This reversibility with temperature confirms the equilibrium nature of the phases observed. Additional information about the structure of the phases has been obtained by basal spacing measurements at constant temperature and alkanol concentration with all nine members of then-alkyl homologs with 10 to 18 carbon atoms in the chains. The structures of the interlayers in the different phases have been discussed.