INFLUENCE OF THE MOLECULAR CHARACTER AND DEGREE OF CROSS-LINKING ON THE INTERACTION OF CROSS-LINKED POLYACRYLAMIDE-SUPPORTED AMINES WITH CU(II) IONS

Amino groups were incorporated into polyacrylamides with 2-20 mol% of crosslinking agents by transamidation with ethylenediamine. Divinylben zene, N,N'-methylene-bis-acrylamide, and tetraethyleneglycol diacrylat e were used as the crosslinking agents. The complexation of these resi ns, which contain ligand functions in different macromolecular structu ral environments, was investigated with Cu(II) ions. The Cu(II) uptake of these different resins was correlated with the molecular character and degree of crosslinking in the polymer matrix. The time course and kinetics of complexation depend on the nature of the crosslinking age nt in the polymer matrix. The swelling behavior of the uncomplexed and complexed resins, structural characteristics, and thermal decompositi on behavior were followed by IR, EPR, and thermal analysis. The swelli ng characteristics of the complexed resins are lower than those of the uncomplexed resins. Complexation resulted in shifting of the IR absor ptions. The EPR parameters depend on the nature of crosslinking and ar e in agreement with the distorted tetragonal geometry of the Cu(II) co mplexes. The thermal decomposition behavior also depends on the nature and the degree of crosslinking in the polymer matrix.