Vinay Hiwase - Academia.edu (original) (raw)

Papers by Vinay Hiwase

The terpolymer resin p-hydroxyacetophenone- quinhydrone –melamine(abbreviated as PAQM-I) was synt... more The terpolymer resin p-hydroxyacetophenone- quinhydrone –melamine(abbreviated as PAQM-I) was synthesized by the condensation of p-hydroxyacetophenone (0.1M), quinhydrone (0.1M) and melamine (0.1M) in the presence of polyphosphoric acid (PPA). The structure of resin was determined by its elemental analysis, UV-VIS, IR and NMR data. The molecular weight of terpolymer was determined by non-aqueous conductometric titration technique. Thermo kinetic parameter was determined by Freeman- Carroll (FC) and Sharp-Wentworth (SW) method. The order of degradation reaction determined by FC method was confirmed by SW method.

Amberlite XAD-4 resin was functionalized by couplin g through the –N=Ngroup (azo spacer arm) with... more Amberlite XAD-4 resin was functionalized by couplin g through the –N=Ngroup (azo spacer arm) with p-t oludine. Resulting intermediate products were characterized by FTIR method. The functionalized resin was charac te ized by elemental analysis and FTIR. Thermokinetic paramete rs were determined by Freeman-Carroll (FC) and Shar pWentworth (SW) methods. Activation energies of the degradation were found to be 27.28 kJ (FC method) a n 25.60 kJ (SW method). Free energy change ( ∆G) and entropy change ( ∆S) of the degradation was calculated by both of these methods were found to be in good agreement. T he order of degradation obtained by FC method was f ound to be zero which was further confirmed by SW method.

The terpolymeric resins abbreviated as PARG-I and PARG-II were synthesized by polyphosphoric acid... more The terpolymeric resins abbreviated as PARG-I and PARG-II were synthesized by polyphosphoric acid (PPA) catalyzed polycondensation of p-hydroxyacetophenone, resorcinol and glycerol in 1:1:3 and 2:1:4 molar proportions respectively. The resins were characterized by various physico-chemical methods such as elemental analysis, IR, 1 H NMR, UV-Vis and nonaqueous conduct metric titration. The thermokinetic parameters were determined using Freeman-Carroll and SharpWentworth methods. The order of degradation was determined by FC method and confirmed by SW method.

The terpolymer resins abbreviated as HPEG-I and HPEG-II were synthesized by polycondensation of p... more The terpolymer resins abbreviated as HPEG-I and HPEG-II were synthesized by polycondensation of p-hydroxybenzaldehyde, terephthalic acid and ethylene glycol using molar ratio 1:1:3 and 2:1:4 of monomers in presence of polyphosphoric acid as catalyst. The tentative structures of these resins were determined by Elemental analysis, 1H NMR, FT-IR and UV-Visible spectra. The molecular weights of resins were determined by non-aqueous conductometric titration. The molecular weights of HPEG-I and HPEG-II were found to be 4416 and 6708 respectively. The tentative structures of resins were found to be

Commercial amberlite XAD-4 resin was functionalized with melamine moiety through -SO2 spacer and ... more Commercial amberlite XAD-4 resin was functionalized with melamine moiety through -SO2 spacer and abbreviated as AXAD-SO2-MLN. Resulting intermediate products were characterized by FTIR method and functionalized resin was characterized by elemental analysis and FTIR. Electrical conducting behavior of resin found to be in the range 0.0115×10-6 to 0.0389× 10-6 mho cm-1 for temperature range 305-593 K. The activation energy (Ea) of conduction was evaluated by Wilson’s law and found to be 1.774 kJ mol-1. The resin was found to exhibit semiconducting behavior.

Resin abbreviated as HBTE-I was synthesized by polycondensation in presence of PPA using phydroxy... more Resin abbreviated as HBTE-I was synthesized by polycondensation in presence of PPA using phydroxybenzaldehyde (0.1 M), thiourea (0.1 M) and ethylene glycol (0.3 M). The structure of resin was assigned by elemental analysis, IR, NMR spectroscopy. Resin was found to show semiconducting behavior in the temperature range 303 K to 468 K. The activation energy of conduction was found to be 2294.3 J mol. The thermokinetic parameters were determined by Freeman-Carroll (FC) and SharpWentworth (SW) method in temperature range 215 625C. The thermokinetic parameters calculated with aid of these methods were found to be in good agreement.

Resin abbreviated as HBSE-II was synthesized by polycondensation in the presence of polyphosphori... more Resin abbreviated as HBSE-II was synthesized by polycondensation in the presence of polyphosphoric acid as a catalyst using monomers p-hydroxybenzaldehyde (0.2M), succinic acid (0.1M) and ethylene glycol (0.4M) at 120C. The molecular weight was determined by non-aqueous conductometric titration. Terpolymer was characterized by elemental analysis, FT-IR, H NMR and UV-Visible spectroscopy. Thermokinetic parameters were calculated by using Freeman-Carroll (FC) and Sharp-Wentworth (SW) methods in the temperature range 405-591C. The values of the activation energy (Ea), frequency factor (A), apparent entropy change (∆S*) and free energy change (∆G) were in good agreement. The order of degradation obtained by the FC method was found to be 0.3 which was further confirmed by SW method.

The proton-ligand stability constants of five important substituted 5-(2-hydroxy phenyl) pyrazole... more The proton-ligand stability constants of five important substituted 5-(2-hydroxy phenyl) pyrazoles and metal-ligand stability constants of their complexes with Co (II) and Ni (II) metal ions have been determined in 70% v/v dioxane-water media at different ionic strength (0.02, 0.04, 0.06, 0.08, 0.1 mol dm-3 of electrolyte, KNO3) and at constant temperature of 303.15K by potentiometric method. The pK and logK values decreased with increase in ionic strength of medium, which indicated the opposite charges on reacting species. The values of stability constants for Ni (II) were greater than for Co (II) metal ion. The thermodynamic stability constants at zero ionic strength have also been determined. The effect of presence of an extra electrolyte on dissociation and complex equilibria of pyrazoles has been studied.

The resin (abbreviated as PNPMF) was derived from base catalyzed polycondensation of p-nitropheno... more The resin (abbreviated as PNPMF) was derived from base catalyzed polycondensation of p-nitrophenol (0.1M), melamine (0.2M) and formaldehyde (0.4M) using 1M NaOH at 120-1250C. The terpolymer resin was characterised by using elemental analysis and spectral analysis. In the present paper, electrical conducting behaviour of terpolymer resin and thermal decomposition were studied over a wide range of temperature. On the basis of electrical conductivity measurement, semiconducting behaviour of terpolymeric resin were studied. Detailed thermal degradation study of the terpolymer was carried out to ascertain its thermal stability. The thermokinetic parameters were determined using Freeman-Carroll (FC) and Sharp Wentworth (SW) method in temperature range (286-4860C). The values of activation energies (Ea), entropy (ΔS), and free energies (ΔG) were in good agreement. The order of degradation reaction determined by FC method was confirmed by SW method.

Archives of Applied Science Research, 2012

Amberlite XAD-4 resin was functionalized by couplin g it through an ‐N=N- group with hydroquinone... more Amberlite XAD-4 resin was functionalized by couplin g it through an ‐N=N- group with hydroquinone. The resulting intermediate products were characterized by FTIR me thod. The functionalized resin was characterized by elemental analysis and FTIR. The Thermokinetic parameters wer e determined by Freeman-Caroll (FC) and Sharp-Wentw orth (SW) methods. The activation energies of degradatio n were found to be 41.61 KJ (FC method) and 40.56 KJ (SW method). The free energy and entropy of degradation was calculated by both of these methods were found to be in good agreement. The order of degradation obtained b y FC method was found to be 0.85 which was further confirmed by SW method.

The resin, DAPT, was synthesized by condensing 2, 6-Diaminopyridine (0.1M) and terphthalic acid (... more The resin, DAPT, was synthesized by condensing 2, 6-Diaminopyridine (0.1M) and terphthalic acid (0.1M) in presence of DCC (Dicyclohexylcarbodiimide). The tentative structure of resin was assigned by elemental analysis, 1H NMR, 13 C NMR, FT-IR and UV-VIS spectra. The molecular weight of resin was determined by non aqueous conductometric titration. The thermo kinetic parameters such as apparent entropy (ΔS), frequency factor (A), free energy change (ΔG) and orders of reaction were determined by Freeman Carroll (FC) and Sharp Wentworth (SW) methods. The order of degradation determined by FC method was confirmed by SW method

The resins PNPRF-I and PNPRF-II were derived from acid catalyzed polycondensation using 1M HCl at... more The resins PNPRF-I and PNPRF-II were derived from acid catalyzed polycondensation using 1M HCl at 120-1250C by varying monomer composition ratio. The resin obtained by condensing p-nitrophenol (0.1M), resorcinol (0.2M) and formaldehyde (0.4M) was abbreviated as PNPRF-I. Similarly the resin prepared by monomer composition p-nitrophenol (0.2M), resorcinol (0.1M) and formaldehyde (0.4M) was abbreviated as PNPRF-II. The tentative structures of these resins were determined by elemental analysis, 1H NMR, FT-IR and UV-Vis spectra. The molecular weight determinations were carried out by non-aqueous conductometric titrations. The conductivities of PNPRF-I and PNPRF-II were found to be in range 0.096 x 10-6 to 0.3294 x 10-6 and 0.0681x 10-6 to 3.1316 x 10-6 mho cm-1 respectively for temperature range 343-573K. The activation energies of conduction for PNPRF-I and PNPRF-II were found to be 4.089 kJ mol-1 and 5.365 kJ mol-1. The antibacterial activities relative to ampicilin for these resins we...

The resin (abbreviated as PNPRF) was derived from acid catalyzed Polycondensation of p-nitropheno... more The resin (abbreviated as PNPRF) was derived from acid catalyzed Polycondensation of p-nitrophenol (0.1M),resorcinol (0.2M) and formaldehyde (0.4M) using 1M HCl at 120-1250C. The chelates of Cr (III), Co (II), Ni (II), and Cu (II) were prepared by using metal salts and PNPRF ligand in DMF medium. The materials were characterised by using elemental analysis, magnetic studies and spectral analysis. In the present paper, electrical conductivity properties of terpolymer and its chelates were studied over a wide range of temperatures. The terpolymer resin and its chelates were found to show semi conducting behaviour. The activation energy of conduction was found to decrease in order [PNPRF] n> [Ni-PNPRF] n> [Co-PNPRF] n> [Cr-PNPRF] n> [Cu- PNPRF] n.

Terpolymeric ligand (m-CMF-I and m-CMF-II) synthesized by acid catalyzed polycondensation of m-cr... more Terpolymeric ligand (m-CMF-I and m-CMF-II) synthesized by acid catalyzed polycondensation of m-cresol and melamine with formaldehyde by varied molar proportion of the reacting monomers. The polycondensation was carried out at 120-1250C in an oil bath in presence of 1M HCl . Structural study was carried out with the help of elemental analysis, IR and NMR. Molecular weight of ligand was determined by non aqueous conductometric titration. In present paper electrical properties of terpolymers were studied. Electrical conductivity was studied as a function of temperature using voltage divider method. Terpolymeric ligands were found to show semiconducting behaviour in different temperature ranges. The activation energy found to be in order m-CMF-I > m-CMF-II.

The resin PNPRF-I were derived from acid catalyzed polycondensation using 1M HCl at 120-1250C by ... more The resin PNPRF-I were derived from acid catalyzed polycondensation using 1M HCl at 120-1250C by varying monomer composition ratio. The resin obtained by condensing p-nitrophenol (0.1M), resorcinol (0.2M) and formaldehyde (0.4M) was abbreviated as PNPRF-I. The tentative structure of this resin was determined by elemental analysis, 1H NMR, FT-IR and UV-Vis spectra. The molecular weight determination was carried out by non-aqueous conductometric titration. The conductivity of PNPRF-I were found to be in range 0.0926 x 10-6 to 0.3294 x 10-6 mho cm-1 respectively for temperature range 343-573K. The activation energy of conduction for PNPRF-I were found to be 4.089 kJ mole-1.On the basis of above studies, this polymer can be ranked as semiconductor. The thermokinetic parameters were determined using Freeman-Carroll (FC) and Sharp Wentworth (SW) method in temperature range (228-4630C).The values of activation energies (Ea), entropy (ΔS) and free energies (ΔG) were in good agreement. The o...

Resin abbreviated as HBAE-I was synthesized by polycondensation in presence of PPA using phydroxy... more Resin abbreviated as HBAE-I was synthesized by polycondensation in presence of PPA using phydroxybenzaldehyde (0.1M), adipic acid (0.1M) and ethylene glycol (0.3M). The structure of resin was assigned by elemental analysis, IR, NMR spectroscopy. Resin was found to show semiconducting behavior in the temperature range 302 K to 488 K. The activation energy of conduction was found to be 785.10 J mol-1. The thermokinetic parameters were determined by Freeman-Carroll (FC) and Sharp Wentworth (SW) method in temperature range 265- 6850C. The thermokinetic parameters calculated with aid of these methods were found to be in good agreement.

Ion-exchange resin abbreviated as HPEG-I was synthesized by polycondensation in the presence of p... more Ion-exchange resin abbreviated as HPEG-I was synthesized by polycondensation in the presence of polyphosphoric acid as a catalyst using monomers p-hydroxybenzaldehyde (0.1M), terephthalic acid (0.1M) and ethylene glycol (0.3M) at 1200C. The terpolymer resin was characterized by elemental analysis, the number average molecular weight, UV-Visible, IR and 1H NMR spectrum. Chelating ion-exchange properties of HPEG-I terpolymer was studied for Sb3+, Bi3+, Zn2+ and Mg2+ ions by the batch equilibrium method. The metal ions were estimated spectrophotometrically. The study was carried out over a wide pH range and in media of various ionic strengths. The terpolymer resin can be used as a selective ion exchange resin for Bi3+ , Mg2+ and Zn2+ ions.

Ion-exchange resin (HBTE-II) was synthesized by polycondensation in the presence of polyphosphori... more Ion-exchange resin (HBTE-II) was synthesized by polycondensation in the presence of polyphosphoric acid as a catalyst using monomers p-hydroxybenzaldehyde (0.2 M), thiourea (0.1 M) and ethylene glycol (0.4 M) at 120 0 C. The terpolymer resin was characterized by elemental analysis, the number average molecular weight, UV-Visible, IR and 1 H NMR spectrum. Chelating ion-exchange properties of this copolymer were studied for Bi 3+ , Sb 3+ , Zn 2+ and Mg 2+ ions. A batch equilibrium method was employed in the study of the selectivity of metal ion uptake involving the measurements of the distribution of a given metal ion between the polymer sample and a solution containing the metal ion. The study was carried out over a wide pH range and in media of various ionic strengths. The metal ions were estimated spectrophotometrically. The HBTE-II terpolymer resin was found to be selective chelating ion-exchange resin for Sb 3+ , Bi 3+ and Zn 2+ .

Der Pharmacia Lettre, 2013

Resin abbreviated as HBSE-I was synthesized by polycondensation in the presence of polyphosphoric... more Resin abbreviated as HBSE-I was synthesized by polycondensation in the presence of polyphosphoric acid as a catalyst using monomers p-hydroxybenzaldehyde (0.1M), succinic acid (0.1M) and ethylene glycol (0.3M) at 1200C. The molecular weight was determined by non-aqueous conductometric titration. Terpolymer was characterized by elemental analysis, FT-IR, 1H NMR and UV-Visible spectroscopy. Thermokinetic parameters were calculated by using Freeman-Carroll (FC) and Sharp-Wentworth (SW) methods in the temperature range 345-4460C. The values of the activation energy (Ea), frequency factor (A), apparent entropy change (ΔS*) and free energy change (ΔG) were in good agreement. The order of degradation obtained by the FC method was found to be 1.91 which was further confirmed by SW method.

The terpolymer resin p-hydroxyacetophenone- quinhydrone –melamine(abbreviated as PAQM-I) was synt... more The terpolymer resin p-hydroxyacetophenone- quinhydrone –melamine(abbreviated as PAQM-I) was synthesized by the condensation of p-hydroxyacetophenone (0.1M), quinhydrone (0.1M) and melamine (0.1M) in the presence of polyphosphoric acid (PPA). The structure of resin was determined by its elemental analysis, UV-VIS, IR and NMR data. The molecular weight of terpolymer was determined by non-aqueous conductometric titration technique. Thermo kinetic parameter was determined by Freeman- Carroll (FC) and Sharp-Wentworth (SW) method. The order of degradation reaction determined by FC method was confirmed by SW method.

Amberlite XAD-4 resin was functionalized by couplin g through the –N=Ngroup (azo spacer arm) with... more Amberlite XAD-4 resin was functionalized by couplin g through the –N=Ngroup (azo spacer arm) with p-t oludine. Resulting intermediate products were characterized by FTIR method. The functionalized resin was charac te ized by elemental analysis and FTIR. Thermokinetic paramete rs were determined by Freeman-Carroll (FC) and Shar pWentworth (SW) methods. Activation energies of the degradation were found to be 27.28 kJ (FC method) a n 25.60 kJ (SW method). Free energy change ( ∆G) and entropy change ( ∆S) of the degradation was calculated by both of these methods were found to be in good agreement. T he order of degradation obtained by FC method was f ound to be zero which was further confirmed by SW method.

The terpolymeric resins abbreviated as PARG-I and PARG-II were synthesized by polyphosphoric acid... more The terpolymeric resins abbreviated as PARG-I and PARG-II were synthesized by polyphosphoric acid (PPA) catalyzed polycondensation of p-hydroxyacetophenone, resorcinol and glycerol in 1:1:3 and 2:1:4 molar proportions respectively. The resins were characterized by various physico-chemical methods such as elemental analysis, IR, 1 H NMR, UV-Vis and nonaqueous conduct metric titration. The thermokinetic parameters were determined using Freeman-Carroll and SharpWentworth methods. The order of degradation was determined by FC method and confirmed by SW method.

The terpolymer resins abbreviated as HPEG-I and HPEG-II were synthesized by polycondensation of p... more The terpolymer resins abbreviated as HPEG-I and HPEG-II were synthesized by polycondensation of p-hydroxybenzaldehyde, terephthalic acid and ethylene glycol using molar ratio 1:1:3 and 2:1:4 of monomers in presence of polyphosphoric acid as catalyst. The tentative structures of these resins were determined by Elemental analysis, 1H NMR, FT-IR and UV-Visible spectra. The molecular weights of resins were determined by non-aqueous conductometric titration. The molecular weights of HPEG-I and HPEG-II were found to be 4416 and 6708 respectively. The tentative structures of resins were found to be

Commercial amberlite XAD-4 resin was functionalized with melamine moiety through -SO2 spacer and ... more Commercial amberlite XAD-4 resin was functionalized with melamine moiety through -SO2 spacer and abbreviated as AXAD-SO2-MLN. Resulting intermediate products were characterized by FTIR method and functionalized resin was characterized by elemental analysis and FTIR. Electrical conducting behavior of resin found to be in the range 0.0115×10-6 to 0.0389× 10-6 mho cm-1 for temperature range 305-593 K. The activation energy (Ea) of conduction was evaluated by Wilson’s law and found to be 1.774 kJ mol-1. The resin was found to exhibit semiconducting behavior.

Resin abbreviated as HBTE-I was synthesized by polycondensation in presence of PPA using phydroxy... more Resin abbreviated as HBTE-I was synthesized by polycondensation in presence of PPA using phydroxybenzaldehyde (0.1 M), thiourea (0.1 M) and ethylene glycol (0.3 M). The structure of resin was assigned by elemental analysis, IR, NMR spectroscopy. Resin was found to show semiconducting behavior in the temperature range 303 K to 468 K. The activation energy of conduction was found to be 2294.3 J mol. The thermokinetic parameters were determined by Freeman-Carroll (FC) and SharpWentworth (SW) method in temperature range 215 625C. The thermokinetic parameters calculated with aid of these methods were found to be in good agreement.

Resin abbreviated as HBSE-II was synthesized by polycondensation in the presence of polyphosphori... more Resin abbreviated as HBSE-II was synthesized by polycondensation in the presence of polyphosphoric acid as a catalyst using monomers p-hydroxybenzaldehyde (0.2M), succinic acid (0.1M) and ethylene glycol (0.4M) at 120C. The molecular weight was determined by non-aqueous conductometric titration. Terpolymer was characterized by elemental analysis, FT-IR, H NMR and UV-Visible spectroscopy. Thermokinetic parameters were calculated by using Freeman-Carroll (FC) and Sharp-Wentworth (SW) methods in the temperature range 405-591C. The values of the activation energy (Ea), frequency factor (A), apparent entropy change (∆S*) and free energy change (∆G) were in good agreement. The order of degradation obtained by the FC method was found to be 0.3 which was further confirmed by SW method.

The proton-ligand stability constants of five important substituted 5-(2-hydroxy phenyl) pyrazole... more The proton-ligand stability constants of five important substituted 5-(2-hydroxy phenyl) pyrazoles and metal-ligand stability constants of their complexes with Co (II) and Ni (II) metal ions have been determined in 70% v/v dioxane-water media at different ionic strength (0.02, 0.04, 0.06, 0.08, 0.1 mol dm-3 of electrolyte, KNO3) and at constant temperature of 303.15K by potentiometric method. The pK and logK values decreased with increase in ionic strength of medium, which indicated the opposite charges on reacting species. The values of stability constants for Ni (II) were greater than for Co (II) metal ion. The thermodynamic stability constants at zero ionic strength have also been determined. The effect of presence of an extra electrolyte on dissociation and complex equilibria of pyrazoles has been studied.

The resin (abbreviated as PNPMF) was derived from base catalyzed polycondensation of p-nitropheno... more The resin (abbreviated as PNPMF) was derived from base catalyzed polycondensation of p-nitrophenol (0.1M), melamine (0.2M) and formaldehyde (0.4M) using 1M NaOH at 120-1250C. The terpolymer resin was characterised by using elemental analysis and spectral analysis. In the present paper, electrical conducting behaviour of terpolymer resin and thermal decomposition were studied over a wide range of temperature. On the basis of electrical conductivity measurement, semiconducting behaviour of terpolymeric resin were studied. Detailed thermal degradation study of the terpolymer was carried out to ascertain its thermal stability. The thermokinetic parameters were determined using Freeman-Carroll (FC) and Sharp Wentworth (SW) method in temperature range (286-4860C). The values of activation energies (Ea), entropy (ΔS), and free energies (ΔG) were in good agreement. The order of degradation reaction determined by FC method was confirmed by SW method.

Archives of Applied Science Research, 2012

Amberlite XAD-4 resin was functionalized by couplin g it through an ‐N=N- group with hydroquinone... more Amberlite XAD-4 resin was functionalized by couplin g it through an ‐N=N- group with hydroquinone. The resulting intermediate products were characterized by FTIR me thod. The functionalized resin was characterized by elemental analysis and FTIR. The Thermokinetic parameters wer e determined by Freeman-Caroll (FC) and Sharp-Wentw orth (SW) methods. The activation energies of degradatio n were found to be 41.61 KJ (FC method) and 40.56 KJ (SW method). The free energy and entropy of degradation was calculated by both of these methods were found to be in good agreement. The order of degradation obtained b y FC method was found to be 0.85 which was further confirmed by SW method.

The resin, DAPT, was synthesized by condensing 2, 6-Diaminopyridine (0.1M) and terphthalic acid (... more The resin, DAPT, was synthesized by condensing 2, 6-Diaminopyridine (0.1M) and terphthalic acid (0.1M) in presence of DCC (Dicyclohexylcarbodiimide). The tentative structure of resin was assigned by elemental analysis, 1H NMR, 13 C NMR, FT-IR and UV-VIS spectra. The molecular weight of resin was determined by non aqueous conductometric titration. The thermo kinetic parameters such as apparent entropy (ΔS), frequency factor (A), free energy change (ΔG) and orders of reaction were determined by Freeman Carroll (FC) and Sharp Wentworth (SW) methods. The order of degradation determined by FC method was confirmed by SW method

The resins PNPRF-I and PNPRF-II were derived from acid catalyzed polycondensation using 1M HCl at... more The resins PNPRF-I and PNPRF-II were derived from acid catalyzed polycondensation using 1M HCl at 120-1250C by varying monomer composition ratio. The resin obtained by condensing p-nitrophenol (0.1M), resorcinol (0.2M) and formaldehyde (0.4M) was abbreviated as PNPRF-I. Similarly the resin prepared by monomer composition p-nitrophenol (0.2M), resorcinol (0.1M) and formaldehyde (0.4M) was abbreviated as PNPRF-II. The tentative structures of these resins were determined by elemental analysis, 1H NMR, FT-IR and UV-Vis spectra. The molecular weight determinations were carried out by non-aqueous conductometric titrations. The conductivities of PNPRF-I and PNPRF-II were found to be in range 0.096 x 10-6 to 0.3294 x 10-6 and 0.0681x 10-6 to 3.1316 x 10-6 mho cm-1 respectively for temperature range 343-573K. The activation energies of conduction for PNPRF-I and PNPRF-II were found to be 4.089 kJ mol-1 and 5.365 kJ mol-1. The antibacterial activities relative to ampicilin for these resins we...

The resin (abbreviated as PNPRF) was derived from acid catalyzed Polycondensation of p-nitropheno... more The resin (abbreviated as PNPRF) was derived from acid catalyzed Polycondensation of p-nitrophenol (0.1M),resorcinol (0.2M) and formaldehyde (0.4M) using 1M HCl at 120-1250C. The chelates of Cr (III), Co (II), Ni (II), and Cu (II) were prepared by using metal salts and PNPRF ligand in DMF medium. The materials were characterised by using elemental analysis, magnetic studies and spectral analysis. In the present paper, electrical conductivity properties of terpolymer and its chelates were studied over a wide range of temperatures. The terpolymer resin and its chelates were found to show semi conducting behaviour. The activation energy of conduction was found to decrease in order [PNPRF] n> [Ni-PNPRF] n> [Co-PNPRF] n> [Cr-PNPRF] n> [Cu- PNPRF] n.

Terpolymeric ligand (m-CMF-I and m-CMF-II) synthesized by acid catalyzed polycondensation of m-cr... more Terpolymeric ligand (m-CMF-I and m-CMF-II) synthesized by acid catalyzed polycondensation of m-cresol and melamine with formaldehyde by varied molar proportion of the reacting monomers. The polycondensation was carried out at 120-1250C in an oil bath in presence of 1M HCl . Structural study was carried out with the help of elemental analysis, IR and NMR. Molecular weight of ligand was determined by non aqueous conductometric titration. In present paper electrical properties of terpolymers were studied. Electrical conductivity was studied as a function of temperature using voltage divider method. Terpolymeric ligands were found to show semiconducting behaviour in different temperature ranges. The activation energy found to be in order m-CMF-I > m-CMF-II.

The resin PNPRF-I were derived from acid catalyzed polycondensation using 1M HCl at 120-1250C by ... more The resin PNPRF-I were derived from acid catalyzed polycondensation using 1M HCl at 120-1250C by varying monomer composition ratio. The resin obtained by condensing p-nitrophenol (0.1M), resorcinol (0.2M) and formaldehyde (0.4M) was abbreviated as PNPRF-I. The tentative structure of this resin was determined by elemental analysis, 1H NMR, FT-IR and UV-Vis spectra. The molecular weight determination was carried out by non-aqueous conductometric titration. The conductivity of PNPRF-I were found to be in range 0.0926 x 10-6 to 0.3294 x 10-6 mho cm-1 respectively for temperature range 343-573K. The activation energy of conduction for PNPRF-I were found to be 4.089 kJ mole-1.On the basis of above studies, this polymer can be ranked as semiconductor. The thermokinetic parameters were determined using Freeman-Carroll (FC) and Sharp Wentworth (SW) method in temperature range (228-4630C).The values of activation energies (Ea), entropy (ΔS) and free energies (ΔG) were in good agreement. The o...

Resin abbreviated as HBAE-I was synthesized by polycondensation in presence of PPA using phydroxy... more Resin abbreviated as HBAE-I was synthesized by polycondensation in presence of PPA using phydroxybenzaldehyde (0.1M), adipic acid (0.1M) and ethylene glycol (0.3M). The structure of resin was assigned by elemental analysis, IR, NMR spectroscopy. Resin was found to show semiconducting behavior in the temperature range 302 K to 488 K. The activation energy of conduction was found to be 785.10 J mol-1. The thermokinetic parameters were determined by Freeman-Carroll (FC) and Sharp Wentworth (SW) method in temperature range 265- 6850C. The thermokinetic parameters calculated with aid of these methods were found to be in good agreement.

Ion-exchange resin abbreviated as HPEG-I was synthesized by polycondensation in the presence of p... more Ion-exchange resin abbreviated as HPEG-I was synthesized by polycondensation in the presence of polyphosphoric acid as a catalyst using monomers p-hydroxybenzaldehyde (0.1M), terephthalic acid (0.1M) and ethylene glycol (0.3M) at 1200C. The terpolymer resin was characterized by elemental analysis, the number average molecular weight, UV-Visible, IR and 1H NMR spectrum. Chelating ion-exchange properties of HPEG-I terpolymer was studied for Sb3+, Bi3+, Zn2+ and Mg2+ ions by the batch equilibrium method. The metal ions were estimated spectrophotometrically. The study was carried out over a wide pH range and in media of various ionic strengths. The terpolymer resin can be used as a selective ion exchange resin for Bi3+ , Mg2+ and Zn2+ ions.

Ion-exchange resin (HBTE-II) was synthesized by polycondensation in the presence of polyphosphori... more Ion-exchange resin (HBTE-II) was synthesized by polycondensation in the presence of polyphosphoric acid as a catalyst using monomers p-hydroxybenzaldehyde (0.2 M), thiourea (0.1 M) and ethylene glycol (0.4 M) at 120 0 C. The terpolymer resin was characterized by elemental analysis, the number average molecular weight, UV-Visible, IR and 1 H NMR spectrum. Chelating ion-exchange properties of this copolymer were studied for Bi 3+ , Sb 3+ , Zn 2+ and Mg 2+ ions. A batch equilibrium method was employed in the study of the selectivity of metal ion uptake involving the measurements of the distribution of a given metal ion between the polymer sample and a solution containing the metal ion. The study was carried out over a wide pH range and in media of various ionic strengths. The metal ions were estimated spectrophotometrically. The HBTE-II terpolymer resin was found to be selective chelating ion-exchange resin for Sb 3+ , Bi 3+ and Zn 2+ .

Der Pharmacia Lettre, 2013

Resin abbreviated as HBSE-I was synthesized by polycondensation in the presence of polyphosphoric... more Resin abbreviated as HBSE-I was synthesized by polycondensation in the presence of polyphosphoric acid as a catalyst using monomers p-hydroxybenzaldehyde (0.1M), succinic acid (0.1M) and ethylene glycol (0.3M) at 1200C. The molecular weight was determined by non-aqueous conductometric titration. Terpolymer was characterized by elemental analysis, FT-IR, 1H NMR and UV-Visible spectroscopy. Thermokinetic parameters were calculated by using Freeman-Carroll (FC) and Sharp-Wentworth (SW) methods in the temperature range 345-4460C. The values of the activation energy (Ea), frequency factor (A), apparent entropy change (ΔS*) and free energy change (ΔG) were in good agreement. The order of degradation obtained by the FC method was found to be 1.91 which was further confirmed by SW method.