DIALKYLDITHIOPHOSPHATE SUBSTITUTED ON POLY(VINYLCHLORIDE) - SYNTHESIS AND PERFORMANCE

Preparation of sodium salt of di (2-ethylhexyl) dithiophosphoric acid (DTPANa) by reaction of the corresponding DTPA with sodium hydride has been described. Nucleophilic substitution of chlorine on poly(vinylchloride) (PVC) by a di(2-ethylhexyl)dithiophosphate group resulting in modified polymer (MP) was characterized by the second order rate constant equal to 6.6 X 10(-5) M-1 s-1. Formation of homogeneous stable gelled phases composed of MP and DTPA, as well as MP, PVC, and DTPA, was demonstrated. The gelled material is capable of selective separation of metal ions under the conditions of extraction chromatography. (C) 1993 John Wiley & Sons, Inc.