SOME PROPERTIES OF HIGH-TEMPERATURE LIQUID-CRYSTALLINE STATIONARY PHASES

The properties of four-temperature liquid crystalline stationary phases were compared in order to determine how they are affected by the type of support and the amount of liquid crystal on the support. Retention times were measured and heats of dissolution (adsorption), activity coefficients and relative retention times of test substances were determined as a function of the column temperature. The Van Deemter depedence was determined. It was found that the interaction between the support and the liquid crystal decreases in the oder Chromosorb W, Chromosorb W AW, Chromosorb W AW DMCS. Mixtures of high-boiling hydrocarbons and their derivatives were separated. A liquid crystal with naphthalene fragments in its molecule was found to be particularly useful in the separation of naphthalene derivatives. © 1979.