Neue stationäre Phasen für die Ionenchromatographie auf Basis schichtstrukturartiger Ionene

This thesis comprises the development of new pellicular phases for the use in anion chromatography. The coating is based on polycationic chains (ionenes) fixed by electrostatic bonding to sulfonated polystyrene-divinylbenzene-particles. The ionenes are synthesized through a Menshutkin-reaction of a tertiary diamin and an alkyl dihalide. The aim is the development of new ionenes with so-called linking-groups between the cationic centres of the main chain. On the one hand the quarternary ammonium functions of the main chain are used for the electrostatic bonding to the carrier particles, on the other hand the linking-groups can be used for the construction of side chains with the exchange groups. For the placement of linking-groups three different concepts are examined: • direct linking-groups (different reactivities within a monomer) • indirect linking-groups (activation by subsequent derivatization) • cationic copolymers (different methods of polymerization) While direct linking-groups show several problems due to different reactivities, the generation of side chains on indirect linking-groups and cationic copolymers is successful. However, the sequential growth of side chains and the associated increase of exchange groups are currently still pose problems.