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Nāgpur, India

Gurnule W.B.,Kamla Nehru College | Patle D.B.,Rashtrasant Tukadoji Maharaj Nagpur University
Polymer Bulletin

A novel chelating copolymer resin has been synthesized through the copolymerization of o-aminophenol and melamine with formaldehyde (o-APMF) in 1:1:3 mol ratio using hydrochloric acid as a reaction medium by condensation technique. The synthesized copolymer resin was characterized by elemental analysis, FTIR, and 1H NMR spectroscopy. On the basis of the spectral studies, the structure of the copolymer resin was proposed. The physico-chemical parameters have been evaluated for the copolymer resin. Non-aqueous conductometric titration was used to determine the average molecular weight and polydispersity of the o-APMF copolymer resin and the intrinsic viscosity was also determined. The semicrystalline nature of the synthesized copolymer was established by scanning electron microscopy (SEM). Batch equilibrium method was employed to study the selectivity and binding capacity of the copolymer resin toward certain trivalent and divalent metal ions such as Fe3+, Zn2+, Cu2+, Pb2+, Cd 2+, and Hg2+ and in different electrolyte concentrations, wide pH ranges, and time intervals. © 2010 Springer-Verlag. Source

Singru R.N.,Rashtrasant Tukadoji Maharaj Nagpur University | Gurnule W.B.,Kamla Nehru College
Journal of Thermal Analysis and Calorimetry

The title terpolymer (8-HQ5-SAMF-II) is synthesized by the condensation of 8-hydroxyquinoline 5-sulfonic acid (8-HQ5-SA) and melamine (M) with formaldehyde (F) in the presence of acid catalyst and using 2:1:3 M proportions of the reacting monomers. The synthesized terpolymer resin is then characterized by different physicochemical techniques viz. number average molecular mass determination, intrinsic viscosity determination, and spectral studies like UV-Visible, IR,1H NMR, and13C NMR spectra. The morphology of synthesized terpolymer was studied by scanning electron microscopy (SEM). The thermogravimetry of the terpolymer resin prepared in this study has been carried out by nonisothermal thermogravimetry technique in which sample is subjected to condition of continuous increase in temperature at linear rate. Thermal study of the resin was carried out to determine their mode of decomposition and relative thermal stabilities. Thermal decomposition curves were studied carefully with minute details. The Freeman-Carroll and Sharp-Wentworth methods have been used in the present investigation to calculate thermal activation energy and different kinetic parameter of the terpolymer resins. Thermal activation energy Ea calculated with the two above-mentioned methods are in close agreement. The advantage of Freeman-Carroll method is to calculate both the order of reaction n and energy of activation in one single stage by keeping heating rate constant. By using data of thermogravimetry, various thermodynamic parameters like frequency factor Z, entropy change ΔS, free energy change ΔF, and apparent entropy S* have been determined using Freeman-Carroll method. © Akadémiai Kiadó, Budapest, Hungary 2010. Source

Copolymer resins (8-HQSABF) were synthesized by the ondensation of 8-hydroxyquinoline-5-sulphonic acid and biuret with formaldehyde in the presence of hydrochloric acid as catalyst, proved to be selective chelation ion exchange copolymer resins for certain metals. Chelation ion exchange properties to these polymers were studied for Cu2+, Cd2+, Co2+and Zn2+ ions. A batch equilibrium method was employed in the study of the selectivity of the distribution of a given metal ions between the polymer sample and a solution containing the metal ion. The study was carried out over a wide pH range and in a media of various ions strengths. The polymer showed a higher selectivity for Cu2+ ions than for Cd2+, Co 2+ and Zn2+ ions. Hence on the basis of above studies these copolymer may be used as semiconductors, surface coating, ion-exchangers, materials for rechargeable battery cell in various electronic industries , plastic materials, elastomers and in boiler plants. Source

Puppalwar S.P.,Kamla Nehru College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Journal of Luminescence

LiNaSO4:Cu and LiNaSO4:Cu,Mg low Z phosphors (Z eff=11.59) are synthesized by wet chemical route and exposed to γ-rays of 60Co for their thermoluminescence (TL) study. The XRD technique showed the crystalline nature of the prepared material. Photoluminescence studies have been undertaken to ensure the successful incorporation of Cu and Mg impurities in LiNaSO4 host lattice. The induced TL glow curves of LiNaSO4:Cu and LiNaSO4:Cu,Mg samples are found at 166 °C and 160 °C with single peak respectively. The TL intensity was found to be enhanced nearly two times by co-doping of Mg in LiNaSO4:Cu. The prepared phosphors have a linear response, less fading and excellent reusability. The whole glow curve displays a good stability under storage at room temperature. Comparison of TL intensity of the most intensive glow peak of LiNaSO4:Cu,Mg with that of standard TLD CaSO4:Dy shows that their intensities are almost equal. The trap parameters namely order of kinetics (b), activation energy (E), frequency factor (s) and Balarin parameter (γ) associated with the most intensive glow peak, i.e. 160 °C glow peak of LiNaSO4:Cu phosphors were determined by using glow curve shape (Chen's) method. The deconvolution of the glow curve was done by using computerized glow curve deconvolution (CGCD) technique. © 2013 Elsevier B.V. Source

Gurnule W.B.,Kamla Nehru College | Katkamwar S.S.,Rashtrasant Tukadoji Maharaj Nagpur University
Journal of Applied Polymer Science

A copolymer resin (p-APDF) has been synthesized using the monomers p-aminophenol, dithiooxamide, formaldehyde in 1: 1: 2M proportions in the presence of 2M HCl as catalyst. The structure of p-APDF copolymer has been elucidated on the basis of elemental analysis and various physicochemical techniques, i.e., UV-visible, FTIR, and 1H-NMR spectroscopy. The number average molecular weight of copolymer resin was determined by nonaqueous conductometric titration in DMF. Viscosity measurement were carried out in DMF indicate normal behavior. The prepared resin proved to be a selective ion exchange resin for some metal ions. The chelating ion exchange properties of this resin was studied for Fe(III) and Cu(II), Ni(II), Co(II), Zn(II), Cd(II), Pb(II) ions. A batch equilibrium method was used to study selectivity of metal ion uptake over a wide pH range and in media of various ionic strength. The resin showed a higher selectivity for Fe(III), Ni(II), Cu(II) ions than for Co(II), Pb(II), Zn(II), and Cd(II) ions. © 2011 Wiley Periodicals, Inc. Source

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