Abstract
The development of later generations of thermally regenerable (TR) ion- exchange resins is traced from those formed from a solution of the monomers acrylic acid and triallylamine hydrochloride, which gives resins with no TR capacity, to those which have a TR capacity of 2.1 meq/g. The resins include those prepared from a solution or emulsion of monomers, amphoteric resins in which acidic and basic groups are attached to a preformed polymer by a chemical reaction, resins made by polymerizing a monomer (or monomer + crosslinker) inside a crosslinked resin, resins prepared by the graft polymeri- zation of monomers onto polymers on which radicals have been generated and resins prepared by the polymerization of monomers around polymeric microparticles.
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