Ion exchange resins are copolymers typically made of styrene and divinyl benzene (DVB), which have a tremendous surface area. The styrene acts as the backbone or chain and the DVB act as the crosslinker. The porous beads that form are referred to as "gel-type" resin. Ion exchange sites are not only on the surface of the bead but throughout the bead. The amount of DVB crosslinker affects the resin’s physical strength, resistance to temperature and oxidative degradation, selectivity and capacity. Cation and anion resins are made similarly with the major difference being the functionalization of the copolymer.
The Weak Base Anion Resin with primary, secondary, tertiary amine or mixed amine group as active functional groups show different strengths of alkalinity. Most weak Base Anion Resin with mixed amine group equiped a extremely high operatin capacity with the ability to remove both strong and weak acids from solution.
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