THERMAL-PROPERTIES OF POLY(N-MALEYL GLYCINE), POLY(N-MALEYL GLYCINE CO ACRYLIC-ACID), AND THEIR METAL-COMPLEXES

The thermal properties of two water-soluble polymers; poly(N-maleyl gl ycine) and poly(N-maleyl glycine-co-acrylic acid) as well as their met al complexes with Co(II), Zn(II), Ni(II), Cu(II), Fe(III), Cd(II), Pb( II), and Hg(II) ions were investigated. The copolymer-metal ion comple xes were obtained in aqueous phase by using the Liquid Phase Polymer-B ased Retention (LPR) technique in conjunction with membrane filtration . The water-soluble P(MG) and P(MG-co-AA) are shown to be useful for t he retention of different metal ions and their separation from element s not bound to the polymeric reagent. The thermal stability of the cop olymer-metal ion complexes under nitrogen atmosphere at 20-500 degrees C was also investigated. The complexes with different transition were characterized with FT-IR and thermogravimetry (TGA). From the TGA dat a the thermal decomposition temperature (TDT) and kinetic parameters s uch as activation energy (Ea) and reaction order (n) were determined.