Herstellung und Charakterisierung pfropfpolymerisierter Anionenaustauscher für die Ionenaustauschchromatographie

Anion exchangers were synthesized via graft polymerization of cationic styrene derivates to a polystyrene-divinylbenzene backbone. It was shown that the capacity of anion exchangers depended on the varied polarity and polymerization properties of the cationic styrene derivates. Relevant sythetic parameters as solvent, initiator and polymeric backbone weremodified and the influence to the separation characteristics evaluated. The functionalization included homopolymerization of functional groups and graft polymerization to the polystyrene-divinylbenzene core as competing reactions. Based on the determined functional principle of this graft method, a process optimization was developed which led both to an increased synthesis yield and improved performance properties by controlled addition of the initiator. By synthesizing a novel functional group and grafting to polystyrene-divinylbenzene resins, new alternatives to the current commercial anion exchangers for separation of small inorganic anions were rendered possible. Further functionalization of polymeric resins with a cationic styrene derivate of marginal polarity led to anion exchangers suitable for element speziation and determination of carbohydrates.