Synthesis of the novel thermo-responsive polymers for the extraction system of noble metal ions.

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Novel temperature-responsive copolymers of N-isopropylacrylamide and monoaza-poly-thioether derivative, were synthesized for the selective extraction of soft metal ions such as silver (I), copper (I), gold (III) and palladium (II) ion. Metal ion extraction using the copolymer with appropriate counter anions such as picrate ion, nitrate or perchlorate ion was examined. Soft metal ions such as silver (I), copper (I), gold (III) and palladium (II) ion were extracted selectively into the solid polymer phase. The extraction efficiency of a metal ion such as silver ion increased as the increase of the ratio of the monoaza-tetrathioether group to N-isopropylacrylamide group in the polymer. The quantitative extraction of class b metal ions as well as the liquid-liquid extraction of metal ions with monoaza-tetrathioether molecule was performed.