Polyacrylamides with 2-20 mol % divinyl benzene (DVB), N,N 0 -methylene-bisacrylamide (NNMBA), 1,6-hexanediol diacrylate (HDODA), and tetraethyleneglycol diacrylate (TTEGDA) crosslinking and without crosslinking were prepared by free radical solution polymerization. Amino functions were incorporated into these polymers by transamidation with excess ethylenediamine. The dye uptake of nonprotonated and protonated aminopolyacrylamides was followed by batch equilibration method towards Rose Bengal (RB), Methyl Orange (MO), Methyl Red (MR), and Methylene Blue (MB). RB uptake by the polyacrylamide-supported systems is higher than other dyes. Generally the dye uptake by the protonated systems is higher than the nonprotonated systems. To optimize the conditions of dye uptake, the effect of the concentration of RB solutions, temperature, and pH were followed. Kinetic studies showed that the uptake of RB by both nonprotonated and protonated crosslinked aminopolyacrylamides is a phase boundary process followed by three-dimensional diffusion. The extent of RB uptake by the various systems depends on the nature and degree of crosslinking, and the relative rigidity/flexibility of the polyacrylamide support. Thus, the dye uptake followed the order: linear > NNMBA-> DVB-> TTEGDA-> HDODA-crosslinked system. The dye uptake followed the same trend as the variation of amino capacity with degree of crosslinking in the respective crosslinked system.
This article describes the development of a new crosslinked poly(N-vinyl-2-pyrrolidone acrylic acid) copolymer for potential applications in catalase-like activity for the decomposition of hydrogen peroxide. The copolymer, crosslinked with hexanediol diacrylate (4 mol %), was prepared by the suspension polymerization of the monomers in water. The metal-ion complexation of copolymerderived sodium salts was investigated for Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), and Zn(II) ions. The metal uptake varied in the following order:. The polymer and metal complexes were characterized by 13 C cross-polarity/magicangle spinning NMR, Fourier transform infrared, ultraviolet-visible, electron paramagnetic resonance, thermogravimetry, and scanning electron microscopy analyses. The catalase-like activities of these insoluble metal complexes were investigated for the decomposition of hydrogen peroxide. Co(II) and Cu(II) complexes were effective for the catalytic decomposition of hydrogen peroxide. The catalytic decomposition was first-order. The effects of various parameters, such as the time, temperature, pH, amount of the catalyst, concentration of hydrogen peroxide, and recyclability of the catalyst, were examined.
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