Synthesis of anion exchangers with large-size pores

Abstract

Styrene-divinylbenzene matrices with large-size pores have been prepared using a mixture of diluents (polystyrene, M w = 1.3–3.54 × 10 5 , and gasoline, b.p. 110–150°C) as porogenic agents. The macromolecular networks have been chloromethylated and subsequently aminated with trimethylamine in order to prepare anion exchangers with supermacroporous structure. The average pore radius of the networks is in the range of 40,000–250,000 Å and the pore volume is around 1.0 ml/g dry resin. The anion-exchange capacity is between 3.00 and 4.00 meq/g. Several of the anion exchanger samples have shown a good sorption capacity for colloidal silica (24.21 g SiO 2/l with an output of 99.80% by comparing with a commercial anion exchanger).