Investigations on the selectivity of grafted high performance anion exchangers and the underlying graft mechanism.

Macroporous, monodisperse PS/DVB particles with diameters of 4.0-4.6 μm were functionalized via free radical graft polymerization to create high performance anion exchangers. Varying the amount of monomer from 0 to 10 mmol per 2.0 g PS/DVB allows a control of the column capacity to create columns with capacities up to 350 μeq/column for 100 mm columns. No further increase of the capacity is observed when using more than 6 mmol of the monomer due to a rivaling homopolymerization. With increasing capacity, the exchangers showed increasing selectivity factors of Br