Abstract:

The retention behaviors of poly(ethylstyrene-divinylbenzene) encapsulated-TiO₂ (ES-DVB-TiO₂) were studied by means of linear solvation energy relationships (LSERs). On the ES-DVB-TiO₂ stationary phase, 21 kinds of compounds were tested in mobile phase of methanol and water. Good relationships between log k' (ES-DVB-TiO₂) and LSERs parameters are obtained. Besides, we compared the retention characteristics of ES-DVB-TiO₂,PBD-TiO₂,ODS and PRP-1. According to percent variance, retention on ES-DVB-TiO₂ synthesized in our laboratory is dominated by three major factors:the solute size (V₂)、hydrogen bond donor acidity(Σα₂^H)、and the solute hydrogen bond acceptor basicity (Σβ₂^H). The results suggest that ES-DVB-TiO₂ stationary phase exhibits a more adsorption-like retention mechanism under room temperature.

Key words: ES-DVB-TiO₂, LSERs, Percent variance, Retention mechanism