SOLVENT IMPREGNATED RESINS - RELATION BETWEEN IMPREGNATION PROCESS AND POLYMER SUPPORT MORPHOLOGY .1. DI-(2-ETHYLHEXYL) DITHIOPHOSPHORIC ACID

The relationship between polymer support morphology and adsorption of di-(2-ethylhexyl)dithiophosphoric acid (DEHTPA) from alcoholic solutio n has been studied. As polymer supports investigated are the conventio nal commercial polymer adsorbents Amberlite XAD-2 and XAD-4 and two mi croporous polymer adsorbents prepared by post-polymerization crosslink ing of swollen chloromethylated gel-type and macroreticular copolymers of styrene and divinylbenzene. Their morphology has been studied by n itrogen adsorption/desorption method. It was found that in the adsorpt ion process DEHTPA fills the pore space gradually from the smallest po res up to pores with a diameter of approximately 10 nm.