Jeevan Dontulwar - Academia.edu (original) (raw)

Uploads

Papers by Jeevan Dontulwar

The copolymer has been synthesized by the polycondesation technique of 2-hydroxyacetophenone with... more The copolymer has been synthesized by the polycondesation technique of 2-hydroxyacetophenone with catechol and formaldehyde in the presence of 2M HCl as a catalyst. The copolymer has been characterized by UV-visible, IR and 1 H NMR spectra. The thermal decomposition behavior of new copolymer was studied using thermogravimetric analysis in air atmosphere. Thermal decomposition curves are discussed with careful attention to minute details. The freeman-Carroll and Sharp-Wentworth methods have been used to calculate activation energy and thermal stability. Thermal activation energy (Ea) calculated with the help of these methods are in agreement with each other. Thermodynamic parameters such as free energy change (∆F), entropy change (∆S), Apparent entropy change(S*) and frequency factor Z are also determined on the basis of TG curves and by using data of the Freeman-Carroll method. Scanning electron microscopy (SEM) was used to establish the surface morphology and nature of the copolymer.

The novel terpolymer (1-N-4-SAHDF-Resin-II) has bee n synthesized by polycondensation of 1-Naphth... more The novel terpolymer (1-N-4-SAHDF-Resin-II) has bee n synthesized by polycondensation of 1-Naphthol-4sulphonic acid and Hexamethylene diamine with Forma ldehyde in an acidic medium with molar proportion o f reactants (2:1:3). To reveal the structure of the r esin, the resin was characterized by elemental anal ysis and a spectral method, i.e. composition of terpolymer has been determined on the basis of its elemental anal ysis. The terpolymer resin has been characterized by FT-IR, N MR (H & C) spectra and by SEM. For thermal decomposition studies, 1-N-4-SAHDF-Resin-II terpol ymer has been studied by Thermo Gravimetric Analysi s (TGA) at heating rate 10°C min-1 under nitrogen atmospher e. Detailed thermal degradation studies of the 1-N4 SAHDFResin-II terpolymer has been carried out to ascerta in its thermal stability. Thermal degradation plot has been discussed in order to determine their mode of decom position, order of reaction(n), thermal activation e ergy(Ea), frequency factor(Z),...

The copolymer (SASF) was synthesized by condensation of salicylic acid and semicarbazide with for... more The copolymer (SASF) was synthesized by condensation of salicylic acid and semicarbazide with formaldehyde in the presence of 2M HCL as a catalyst at 126 ± 2 0C for 5 hrs. with molar proportion of reactants. Thermal study of the resins was carried out to determine their mode of decomposition and relative thermal stabilities by elemental analysis, FT-IR, UV-Visible 1H-NMR Spectroscopy. The thermal decomposition behavior of copolymer was studied by using TGA in static nitrogen atmosphere at a heating rate of 100C/min. Freeman Carroll and Sharp-Wentworth methods were used to calculate the thermal activation energy (Ea), the order of reaction (n), entropy Change (ΔS), free energy change (ΔF), apperent entropy change (ΔS), and frequency factor (Z). The thermal activation energy determined with the help of this method was in good agreement with each other. The antimicrobial activity for certain bacteria such as S. subtilis, E. coli, S. typhi, A. niger, S. aureus and C. albicans were studied.

Polymer was synthesized from the polymerization of 8-hydroxyquinoline 5-sulphonic acid and catech... more Polymer was synthesized from the polymerization of 8-hydroxyquinoline 5-sulphonic acid and catechol with formaldehyde (8-HQ- 5- SACF) by solution condensation in an acid medium. The polymer was characterized by elemental analysis, UV-Visible spectra, FTIR and NMR spectroscopy The thermal stability of the polymer was determined by TGA. In addition, the activation energy for the formation of polymer was calculated using TGA data by Freeman-Carroll method and Sharp-Went-worth method. The surface features of the polymer was analyzed by scanning electron microscopy (SEM). The thermodynamic parameter such as free energy change (ΔF), entropy change (ΔS) , Apparent entropy change( S*) and frequency factor Z are also determined on the basis of TGA curve and by using data of Freeman-Carroll method .

Asian Journal of Research in Chemistry, 2012

Asian Journal of Research in Chemistry, 2017

Journal of Applied Polymer Science, 1983

ABSTRACT

Applied Catalysis B: Environmental, 2008

ABSTRACT

A terpolymer 1-N-4-SAHDF-Resin-II was synthesized from 1-Naphthol-4-sulphonic acid and Hexamethyl... more A terpolymer 1-N-4-SAHDF-Resin-II was synthesized from 1-Naphthol-4-sulphonic acid and Hexamethylene diamine with formaldehyde by polycondenssation method in an acidic medium with molar proportion of reactants (2:1:3).To reveal the structure of the resin, the resin was characterized by elemental analysis and spectral methods, i.e. composition of terpolymer has been determined on the basis of its elemental analysis. The terpolymer resin has been characterized by UV- Visible, FT-IR and NMR (1H & 13C) spectra and by SEM. The DC conductivity of sample was determined by four probe method. The conductivity of 1-N-4-SAHDF-Resin-II was found to be in the range of 1.021 x10-7 to 9.247 x 10-5 ohm-1cm-1 in the temperature range 313K-433K. The activation energy of the conduction for 1-N-4-SAHDF-Resin-II was found to be 1.14 x 10-20 J/K.

Asian Journal of Research in Chemistry, 2017

The copolymer has been synthesized by the polycondesation technique of 2-hydroxyacetophenone with... more The copolymer has been synthesized by the polycondesation technique of 2-hydroxyacetophenone with catechol and formaldehyde in the presence of 2M HCl as a catalyst. The copolymer has been characterized by UV-visible, IR and 1 H NMR spectra. The thermal decomposition behavior of new copolymer was studied using thermogravimetric analysis in air atmosphere. Thermal decomposition curves are discussed with careful attention to minute details. The freeman-Carroll and Sharp-Wentworth methods have been used to calculate activation energy and thermal stability. Thermal activation energy (Ea) calculated with the help of these methods are in agreement with each other. Thermodynamic parameters such as free energy change (∆F), entropy change (∆S), Apparent entropy change(S*) and frequency factor Z are also determined on the basis of TG curves and by using data of the Freeman-Carroll method. Scanning electron microscopy (SEM) was used to establish the surface morphology and nature of the copolymer.

The novel terpolymer (1-N-4-SAHDF-Resin-II) has bee n synthesized by polycondensation of 1-Naphth... more The novel terpolymer (1-N-4-SAHDF-Resin-II) has bee n synthesized by polycondensation of 1-Naphthol-4sulphonic acid and Hexamethylene diamine with Forma ldehyde in an acidic medium with molar proportion o f reactants (2:1:3). To reveal the structure of the r esin, the resin was characterized by elemental anal ysis and a spectral method, i.e. composition of terpolymer has been determined on the basis of its elemental anal ysis. The terpolymer resin has been characterized by FT-IR, N MR (H & C) spectra and by SEM. For thermal decomposition studies, 1-N-4-SAHDF-Resin-II terpol ymer has been studied by Thermo Gravimetric Analysi s (TGA) at heating rate 10°C min-1 under nitrogen atmospher e. Detailed thermal degradation studies of the 1-N4 SAHDFResin-II terpolymer has been carried out to ascerta in its thermal stability. Thermal degradation plot has been discussed in order to determine their mode of decom position, order of reaction(n), thermal activation e ergy(Ea), frequency factor(Z),...

The copolymer (SASF) was synthesized by condensation of salicylic acid and semicarbazide with for... more The copolymer (SASF) was synthesized by condensation of salicylic acid and semicarbazide with formaldehyde in the presence of 2M HCL as a catalyst at 126 ± 2 0C for 5 hrs. with molar proportion of reactants. Thermal study of the resins was carried out to determine their mode of decomposition and relative thermal stabilities by elemental analysis, FT-IR, UV-Visible 1H-NMR Spectroscopy. The thermal decomposition behavior of copolymer was studied by using TGA in static nitrogen atmosphere at a heating rate of 100C/min. Freeman Carroll and Sharp-Wentworth methods were used to calculate the thermal activation energy (Ea), the order of reaction (n), entropy Change (ΔS), free energy change (ΔF), apperent entropy change (ΔS), and frequency factor (Z). The thermal activation energy determined with the help of this method was in good agreement with each other. The antimicrobial activity for certain bacteria such as S. subtilis, E. coli, S. typhi, A. niger, S. aureus and C. albicans were studied.

Polymer was synthesized from the polymerization of 8-hydroxyquinoline 5-sulphonic acid and catech... more Polymer was synthesized from the polymerization of 8-hydroxyquinoline 5-sulphonic acid and catechol with formaldehyde (8-HQ- 5- SACF) by solution condensation in an acid medium. The polymer was characterized by elemental analysis, UV-Visible spectra, FTIR and NMR spectroscopy The thermal stability of the polymer was determined by TGA. In addition, the activation energy for the formation of polymer was calculated using TGA data by Freeman-Carroll method and Sharp-Went-worth method. The surface features of the polymer was analyzed by scanning electron microscopy (SEM). The thermodynamic parameter such as free energy change (ΔF), entropy change (ΔS) , Apparent entropy change( S*) and frequency factor Z are also determined on the basis of TGA curve and by using data of Freeman-Carroll method .

Asian Journal of Research in Chemistry, 2012

Asian Journal of Research in Chemistry, 2017

Journal of Applied Polymer Science, 1983

ABSTRACT

Applied Catalysis B: Environmental, 2008

ABSTRACT

A terpolymer 1-N-4-SAHDF-Resin-II was synthesized from 1-Naphthol-4-sulphonic acid and Hexamethyl... more A terpolymer 1-N-4-SAHDF-Resin-II was synthesized from 1-Naphthol-4-sulphonic acid and Hexamethylene diamine with formaldehyde by polycondenssation method in an acidic medium with molar proportion of reactants (2:1:3).To reveal the structure of the resin, the resin was characterized by elemental analysis and spectral methods, i.e. composition of terpolymer has been determined on the basis of its elemental analysis. The terpolymer resin has been characterized by UV- Visible, FT-IR and NMR (1H & 13C) spectra and by SEM. The DC conductivity of sample was determined by four probe method. The conductivity of 1-N-4-SAHDF-Resin-II was found to be in the range of 1.021 x10-7 to 9.247 x 10-5 ohm-1cm-1 in the temperature range 313K-433K. The activation energy of the conduction for 1-N-4-SAHDF-Resin-II was found to be 1.14 x 10-20 J/K.

Asian Journal of Research in Chemistry, 2017