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Ammonium Sulfamate

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Irina A. Uspenskaya – One of the best experts on this subject based on the ideXlab platform.

  • Thermodynamic properties of Ammonium Sulfamate
    The Journal of Chemical Thermodynamics, 2019
    Co-Authors: Daria A. Kosova, Anna I. Druzhinina, L. A. Tiflova, A.s. Monayenkova, Elizaveta V. Belyaeva, Irina A. Uspenskaya
    Abstract:

    Abstract Molar heat capacity of Ammonium Sulfamate (NH4SO3NH2) was measured in the temperature range from 8 K to 335 K by low-temperature vacuum adiabatic calorimetry. Obtained data were approximated by linear combination of Einstein functions. Heat content and entropy of NH4SO3NH2 were calculated from these data. Enthalpy of NH4SO3NH2 dissolution in water was determined at 298.15 K by means of solution calorimetry. On the basis of experimental data the standard entropy, enthalpy and Gibbs energy NH4SO3NH2 formation at 298.15 K were calculated. The phase transition of NH4SO3NH2 was observed by adiabatic calorimetry.

  • a water urea Ammonium Sulfamate system experimental investigation and thermodynamic modelling
    Fluid Phase Equilibria, 2016
    Co-Authors: Daria A. Kosova, A. L. Voskov, N. A. Kovalenko, Irina A. Uspenskaya
    Abstract:

    Abstract The Water–Urea–Ammonium Sulfamate ternary system was investigated by means of experimental methods and thermodynamic modelling. Experimental part of the work includes (i) DSC measurements of liquidus and solidus of the Urea–Ammonium Sulfamate, the Water–Ammonium Sulfamate subsystems with the estimation of eutectic point position and a set of experiments on the phase boundaries in the ternary system; (ii) vapor pressure measurements in the binary Water–Ammonium Sulfamate and ternary Water–Ammonium Sulfamate–Urea systems at 298.15 K in a wide concentration range. Excess Gibbs energies of the Water–Ammonium Sulfamate–Urea system and its binary subsystems were described by the Pitzer-Simonson-Clegg model which is reduced to polynomial formalism in case of nonelectrolyte systems. Results of the Water–Urea subsystem reassessment are given.

  • Volumetric Properties of Binary and Ternary Solutions in the Water–Urea–Ammonium Sulfamate System
    Journal of Solution Chemistry, 2016
    Co-Authors: Daria A. Kosova, A. L. Voskov, Irina A. Uspenskaya
    Abstract:

    Densities of liquid phases in the water–urea–Ammonium Sulfamate ternary system and in the binary water–Ammonium Sulfamate subsystem were investigated in a wide concentration range at 288.15, 298.15 and 323.15 K. A volumetric model of the aqueous ternary solutions was proposed.

Daria A. Kosova – One of the best experts on this subject based on the ideXlab platform.

  • Thermodynamic properties of Ammonium Sulfamate
    The Journal of Chemical Thermodynamics, 2019
    Co-Authors: Daria A. Kosova, Anna I. Druzhinina, L. A. Tiflova, A.s. Monayenkova, Elizaveta V. Belyaeva, Irina A. Uspenskaya
    Abstract:

    Abstract Molar heat capacity of Ammonium Sulfamate (NH4SO3NH2) was measured in the temperature range from 8 K to 335 K by low-temperature vacuum adiabatic calorimetry. Obtained data were approximated by linear combination of Einstein functions. Heat content and entropy of NH4SO3NH2 were calculated from these data. Enthalpy of NH4SO3NH2 dissolution in water was determined at 298.15 K by means of solution calorimetry. On the basis of experimental data the standard entropy, enthalpy and Gibbs energy NH4SO3NH2 formation at 298.15 K were calculated. The phase transition of NH4SO3NH2 was observed by adiabatic calorimetry.

  • a water urea Ammonium Sulfamate system experimental investigation and thermodynamic modelling
    Fluid Phase Equilibria, 2016
    Co-Authors: Daria A. Kosova, A. L. Voskov, N. A. Kovalenko, Irina A. Uspenskaya
    Abstract:

    Abstract The Water–Urea–Ammonium Sulfamate ternary system was investigated by means of experimental methods and thermodynamic modelling. Experimental part of the work includes (i) DSC measurements of liquidus and solidus of the Urea–Ammonium Sulfamate, the Water–Ammonium Sulfamate subsystems with the estimation of eutectic point position and a set of experiments on the phase boundaries in the ternary system; (ii) vapor pressure measurements in the binary Water–Ammonium Sulfamate and ternary Water–Ammonium Sulfamate–Urea systems at 298.15 K in a wide concentration range. Excess Gibbs energies of the Water–Ammonium Sulfamate–Urea system and its binary subsystems were described by the Pitzer-Simonson-Clegg model which is reduced to polynomial formalism in case of nonelectrolyte systems. Results of the Water–Urea subsystem reassessment are given.

  • Volumetric Properties of Binary and Ternary Solutions in the Water–Urea–Ammonium Sulfamate System
    Journal of Solution Chemistry, 2016
    Co-Authors: Daria A. Kosova, A. L. Voskov, Irina A. Uspenskaya
    Abstract:

    Densities of liquid phases in the water–urea–Ammonium Sulfamate ternary system and in the binary water–Ammonium Sulfamate subsystem were investigated in a wide concentration range at 288.15, 298.15 and 323.15 K. A volumetric model of the aqueous ternary solutions was proposed.

Serge Bourbigot – One of the best experts on this subject based on the ideXlab platform.

  • Flame Retardancy of PA6 Using a Guanidine Sulfamate/Melamine Polyphosphate Mixture
    Polymers, 2015
    Co-Authors: Mathieu Coquelle, Sophie Duquesne, Mathilde Casetta, Jun Sun, Sheng Zhang, Serge Bourbigot
    Abstract:

    Polyamide 6 (PA6) is a widely-used polymer that could find applications in various sectors, including home textiles, transportation or construction. However, due to its organic nature, PA6 is flammable, and flame-retardant formulations have to be developed to comply with fire safety standards. Recently, it was proposed to use Ammonium Sulfamate as an effective flame retardant for PA6, even at low loading content. However, processing issues could occur with this additive considering large-scale production. This paper thus studies the use of another Sulfamate salt—guanidine Sulfamate (GAS)—and evidences its high efficiency when combined with melamine polyphosphate (MPP) as a flame retardant for PA6. A decrease of the peak of the heat release rate by 30% compared to pure PA6 was obtained using only 5 wt% of a GAS/MPP mixture in a microscale calorimeter. Moreover, PA6 containing the mixture GAS/MPP exhibits a Limiting Oxygen Index (LOI) of 37 vol% and is rated V0 for the UL 94 test (Vertical Burning Test; ASTM D 3801). The mechanisms of degradation were investigated analyzing the gas phase and solid phase when the material degrades. It was proposed that MPP and GAS modify the degradation pathway of PA6, leading to the formation of nitrile end-group-containing molecules. Moreover, the formation of a polyaromatic structure by the reaction of MPP and PA6 was also shown.

  • flame retardancy of pa6 using a guanidine Sulfamate melamine polyphosphate mixture
    Polymers, 2015
    Co-Authors: Mathieu Coquelle, Sophie Duquesne, Mathilde Casetta, Jun Sun, Sheng Zhang, Serge Bourbigot
    Abstract:

    Polyamide 6 (PA6) is a widely-used polymer that could find applications in various sectors, including home textiles, transportation or construction. However, due to its organic nature, PA6 is flammable, and flame-retardant formulations have to be developed to comply with fire safety standards. Recently, it was proposed to use Ammonium Sulfamate as an effective flame retardant for PA6, even at low loading content. However, processing issues could occur with this additive considering large-scale production. This paper thus studies the use of another Sulfamate salt—guanidine Sulfamate (GAS)—and evidences its high efficiency when combined with melamine polyphosphate (MPP) as a flame retardant for PA6. A decrease of the peak of the heat release rate by 30% compared to pure PA6 was obtained using only 5 wt% of a GAS/MPP mixture in a microscale calorimeter. Moreover, PA6 containing the mixture GAS/MPP exhibits a Limiting Oxygen Index (LOI) of 37 vol% and is rated V0 for the UL 94 test (Vertical Burning Test; ASTM D 3801). The mechanisms of degradation were investigated analyzing the gas phase and solid phase when the material degrades. It was proposed that MPP and GAS modify the degradation pathway of PA6, leading to the formation of nitrile end-group-containing molecules. Moreover, the formation of a polyaromatic structure by the reaction of MPP and PA6 was also shown.

  • investigation of the decomposition pathway of polyamide 6 Ammonium Sulfamate fibers
    Polymer Degradation and Stability, 2014
    Co-Authors: Mathieu Coquelle, Serge Bourbigot, Sophie Duquesne, Mathilde Casetta, Jun Sun, Sheng Zhang
    Abstract:

    Abstract Polyamide 6 (PA6) is one of the most used polymers for synthetic textiles. PA6 fibers must be flame retarded to be used in building, home textiles or in transportation and must meet strict legislation. At this time, no acceptable flame-retardant solutions exist for PA6 fibers mainly because of processing issues (melt spinning of the fibers containing flame retardant additives). It was demonstrated in the literature that Ammonium Sulfamate (AS) is a flame retardant for polyamide 6. This paper investigates the effect of such additive in PA6 fibers. It was shown that fibers containing less than 7 wt.% of AS are spinnable while preserving the mechanical properties. Moreover, the peak of heat release rate measured in microcalorimeter decreases as a function of AS content in the formulation. It is reduced by 30% at 7 wt.% loading. The decomposition pathway of such material was investigated and the results suggest an action in the gas phase. Thermogravimetric analyses also reveal that a condensed phase mechanism is involved in the mechanism of action of AS in PA6. Solid state nuclear magnetic resonance (NMR) of the charred residues confirms this result and shows that AS promotes the formation of aromatic char.