No abstract

No abstract

A new polymeric resin with thiol pendant functions has been prepared for the extraction of mercuric ions. The thiol containing sulfonamide based resin with 3.5 mmol/g total nitrogen content is able to selectively sorb mercury from aqueous solutions. The mercury sorption capacity of the resin is around 1.70 mmol/g under non-buffered conditions. Experiments performed in identical conditions with several metal ions revealed that Cd(II), Pb(II), Zn(II), Fe(III), and Fe (II) ions also were extractable in quantities (1.0-1.65 mmol/g). The sorbed mercury can be eluted by repeated treatment with 4M HNO 3 without hydrolysis of the amide groups.

A methacrylate monomer, cyclohexene-3-yl methyl methacrylate (CHMA) was synthesized by reaction of 3-cyclohexene-1-methanol with methacryloyl chloride in the presence of triethylamine at 0-5°C. The homopolymer of CHMA and its copolymer with styrene (St) were prepared by free radical polymerization. The Fourier transform infrared (FT-IR), 1 H NMR, and 13 C NMR spectroscopic techniques were used to characterize the homopolymers and copolymers.1 H NMR spectra were used to determine the compositions of the copolymers. Linearization methods such as Kelen-Tüdös, Extended Kelen-Tüdös, and a non-linear least squares method were all used to determine the reactivity ratios of the monomers. The effect of copolymer compositions on their thermal behavior was studied by differential thermal analysis and thermogravimetric analysis methods.

Blends of poly(methyl methacrylate) (PMMA) and poly(2-methacrylamidopyridine) (PMAP) obtained from free radical polymerization were prepared by casting films from CHCl 3 solution, followed by drying for a few days. The blends were characterized by differential scanning calorimetry and Fourier transform infra-red spectroscopy. Single glass transitions indicate that the blend components are miscible. Thermogravimetric analysis shows that thermal stabilities of the blends are low compared to those of the homopolymer components. At lower temperatures, the cyclic imidation reaction effectively degrades the PMAP component in the blends and this reaction occurs at lower temperatures than does that of PMAP homopolymer because of hydrogen bonding between imine structures in PMAP and the ester carbonyl in PMMA. Thermal degradation of the blends has been followed up also as the (infrared) IR changes in them.Thermal degradation of the blend (PMMA:PMAP ¼ 50:50 by wt) has been produced both in monomer in lower percentage and 2-aminopyridine in higher percentage compared with those of the homopolymers.