Preparation of spin-labeled styrene-divinylbenzene copolymers and a new approach for quantitative determination of the resin loading using ESR spectroscopy

Several spin-labeled carboxyl-containing resins were prepared, containing d ifferent concentrations of spin labels (nitroxyl or verdazyl stable free ra dicals). ESR studies of the prepared resin specimens demonstrated that the dependence between their ESR signal area and estimated and/or calculated am ount of attached spin labels is linear in the case of verdazyl radicals, wh ich makes this non-destructive approach a promising fast and accurate metho d for a resin loading determination. (C) 1998 Elsevier Science Ltd. All rig hts reserved.