Synthesis of davankov-type hypercrosslinked resins using different isomer compositions of vinylbenzyl chloride monomer, and application in the solid-phase extraction of polar compounds

Identifier:  imarina:9284358

Handle: https://hdl.handle.net/20.500.11797/imarina9284358

Authors:  Fontanals, N; Cortés, J; Galià, M; Marcé, RM; Cormack, PAG; Borrull, F; Sherrington, DC

Abstract:
Two different gel-type resins have been prepared by suspension polymerization using 2 wt % divinylbenzene (DVB) with either p-vinylbenzyl chloride (pVBC) or a mixture of VBC isomers (? 70% m-; ? 30% p-). Significant difference in the chlorine content was observed, which was attributed to a more favored hydrolysis process when p-VBC was used. The presence of hydroxyl groups has been confirmed by elemental microanalytical data and solid-state 13C cross-polarization/magic angle spinning (CP-MAS) nuclear magnetic resonance (NMR) spectra. Hypercrosslinked resins were prepared from both gel-type precursors by treatment with FeCl3 in 1,2-dichloroethane (DCE) at 80°C. The resultant resins showed differences in specific surface area and degree of hydrophilicity. The performance of the hypercrosslinked resins was evaluated in solid-phase extraction (SPE) of polar compounds, and better results were obtained for the hypercrosslinked resin prepared from p-VBC that combines a relatively high specific surface area (908 m2 g-1) and somewhat higher oxygen content (3.96 wt % O). © 2005 Wiley Periodicals, Inc.