The monomer 5-(4-acryloyloxyphenylazo)-salicylaldehyde [5, was prepared and polymerized in dimethylformamide (DMF) at 70 C using benzoyl peroxide as free radical initiator. Poly5-(4-acryloyloxyphenylazo) salicylaldehyde [poly(5,4-APASAL)] was characterized by infrared and nuclear magnetic resonance spectroscopic technique. The molecular weight of the polymer was determined by gel permeation chromatography method. Cu(II), Ni(II), Cr(III), and Cr(VI) complexes of poly(5,4-APASAL) were prepared. Elemental analysis of polychelates suggests that the metal to ligand ratio is about 1 : 2. The polymer metal complexes were also characterized by XRD, magnetic moment, and thermal analysis. The effect of pH and electrolyte concentration in the metal uptake behavior of the polymer was also studied.
The polymeric ligand (resin) was prepared from 1-(4-hydroxyphenylazo)-2-naphthol (4HPA2N-F) with formaldehyde in the presence of oxalic acid as a catalyst. Poly (4HPA2N-F) was characterized by Fourier transform infrared and 1 H-NMR spectroscopic techniques. The molecular weight of the polymer was determined by gel permeation chromatography. Polychelates were obtained when the dimethylformamide solution of the polymer containing a few drops of ammonium hydroxide was treated with a aqueous solution of Cu(II)/Ni(II). The Infrared spectra of polychelates suggest that the metals were coordinated through the oxygen of the phenolic-OH group and nitrogen of the azo group. The thermogravimetic analysis, differential scanning calorimetry and X-ray diffraction studies indicate that the incorporation of the metal ion significantly enhanced the degree of crystallinity. The sorption properties of the chelate-forming polymer towards various metal ion Cu(II) and Ni(II) were studied as a function of pH, nature and concentration of electrolytes. The antibacterial activities of polymer and its metal complexes against several microorganisms were also investigated by using agar well diffusion method.
Novel supramolecular side-chain liquid-crystalline polymers were prepared from poly(acrylic acid) (PAA) and pyridyl Schiff base derivatives through intermolecular hydrogen-bonding interaction between PAA and nitrogen of pyridyl Schiff base derivatives. PAA used as H-bond donor. Pyridyl Schiff base derivatives used as H-bond acceptors. The existence of H-bonding was confirmed by FT-IR spectroscopy.Polymer complexes exhibited stable thermotropic mesophase. Differential scanning calorimetry, polarized optical microscopy, and X-ray diffraction measurements were used to investigate LC behavior. The complexes exhibited smectic C phase broken-fan shaped texture. On increasing spacer length of substituent, the clearing temperature range of the mesophase increased.
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