Thermal degradation, kinetic and correlation models of poly(vinylidene fluoride–chlorotrifluoroetheylene) copolymers

Singh, Ajaib; Soni, Pramod Kumar; Singh, Manjit; Srivastava, Alok Kumar

doi:10.1016/j.tca.2012.08.031

Cited by 37 publications

(23 citation statements)

References 38 publications

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“…Figure 8 shows Kissinger plots for aged and unaged TATB using DTA fitting data. The activation energy obtained for aged TATB was around 176.9 kJ·mol −1 , while the activation energy for the whole decomposition reactions for unaged TATB was around 178.1 kJ·mol −1 with pre-exponential factors of 9.89×10 13 results are close to that of the KAS methods and the difference between them is small (less than 1%). Linear least squares fits for all kinetic methods by applying temperature peak for maximum reaction rate give good values for the regression coefficients.…”

Section: Thermal Decomposition Kineticssupporting

confidence: 67%

“…Solid-state kinetics is generally studied by means of thermogravimetric analysis [13][14][15] which measures change in mass when material is subjected to heat or held at a constant temperature. For the thermal decomposition, the rate of reaction is described by two functions: the rate constant (k) and the extent of the conversion (α):…”

Section: Theoretical Approach For Kinetic Studymentioning

confidence: 99%

“…After the kinetic parameters had been obtained using various kinetic methods, the thermodynamic parameters such as change of enthalpy ΔH # , Gibbs free energy ΔG # , and entropy ΔS # for formation of the activated complex [39] were calculated using the following equations [12][13][14]. These parameters are important indicators of thermal safety.…”

Section: Thermodynamic Parametersmentioning

confidence: 99%

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Investigations on Chemical, Thermal Decomposition Behavior, Kinetics, Reaction Mechanism and Thermodynamic Properties of Aged TATB

Singh¹,

Kaur²,

Sarkar³

et al. 2018

Cent. Eur. J. Energ. Mater.

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1,3,5-triamino-2,4,6-trinitrobenzene (TATB) is a kind of insensitive high explosive that can be used as an energetic material in nuclear weapon and space applications. In this work, we have studied the effect of aging on the properties of TATB from a 20 year old lot that had been in direct contact with casing and natural environment conditions. The kinetics was studied using the temperature at the maximum reaction rate (peak) and isoconversional methods from TGA and DTA data obtained at five heating rates under a nitrogen atmosphere. The properties investigated for thermal stability indicate that there is no change in the properties during prolonged exposure in natural environment conditions. The activation energy calculated by the Kissinger method was 179.9 kJ·mol −1 by DTG and the 176.9 kJ·mol −1 by DTA. The experimental results of kinetic analysis obtained by isoconversional methods are in good agreement and very close to each other. In the analysis of reaction mechanisms, the reaction models could be probably best described by a surface contraction mechanism using the Coats-Redfern and Criado methods. The thermodynamic parameters such as Gibbs free energy, enthalpy and entropy of activation were also investigated. The self-accelerating decomposition temperature (TSADT) and critical temperature for thermal explosion (Tb) were also calculated.

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Section: Thermal Decomposition Kineticssupporting

confidence: 67%

Section: Theoretical Approach For Kinetic Studymentioning

confidence: 99%

Section: Thermodynamic Parametersmentioning

confidence: 99%

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Investigations on Chemical, Thermal Decomposition Behavior, Kinetics, Reaction Mechanism and Thermodynamic Properties of Aged TATB

Singh¹,

Kaur²,

Sarkar³

et al. 2018

Cent. Eur. J. Energ. Mater.

Self Cite

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“…Therefore, with a view to discover the reaction kinetic model of mixes, the Criado method was selected as it includes reaction mechanisms. The models and articulations of related function g (α) and f (α) are observed in Table .…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, the amount of z (α) was calculated for every amount of α by multiplying an empirical amount of ( d α/ dt ) α and T α . It has been set up that the expression in the brackets of eq. has a negligible influence in the form of z (α) function.…”

Section: Resultsmentioning

confidence: 99%

Rheological characterization and modeling of vulcanization kinetics of natural rubber/starch blends

Alwaan

2018

J of Applied Polymer Sci

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Vulcanization kinetics of natural rubber/starch (NR/ST) blends was investigated by oscillating disc rheometer. The scorch and cure times are significantly reduced with the loading of starch in all blends from 1.15 and 2.22 to 0.91 and 1.88 min, respectively, to improve curing rate. Meanwhile, the maximum torque values and the maximum vulcanization rate of NR/ST blend increase with the starch loading from 1.51 N m and 0.387 min−1 to 2.224 N m and 0.492 min−1 respectively. The results of vulcanization kinetics of NR and its blends revealed that it is controlled by two‐stages, chemical and diffusion. The experimental data of the vulcanization rate of NR/ST blends did not fit with autocatalytic kinetic model except the pure natural rubber. Therefore, the Criado method was used and it was observed that the reaction kinetic model of pure NR and its blends with starch is best described by the D diffusion model (D2). © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46347.

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Preparation and characterization of photocurable fluorinated polyether‐based reactive inks

Zhou

Zhang

et al. 2023

J of Applied Polymer Sci

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Photocurable polymer provides fast curable properties via ultraviolet (UV) light for 3D-printed propellants. This work outlines the preparation and characterization of photocurable fluorinated polyether-based reactive inks.Acrylate-terminated poly-2-((2,2,3,3,3-pentafluoropropoxy)-methyl) ethylene oxide (P5F-AA) was synthesized as photocurable binder through the esterification of acrylic acid, and the terminal hydroxyl group of poly-2-((2,2,3,3,3pentafluoropropoxy)-methyl) ethylene oxide (P5F), which was synthesized through cationic ring-opening polymerization of 2-((2,2,3,3,3-pentafluoropropoxy)methyl) oxy-ethane (PFEE) by using butane diol as initiator. In comparison with P5F, P5F-AA had a lower glass transition temperature (T g ) of À63.3 C. A new type of photocurable resin, which may be used for additive manufacturing of energetic materials, was prepared via UV radiation in an LED UV curing tank by using P5F-AA as prepolymer, diphenyl (2,4,6-trimethyl benzoyl) phosphine oxide (TPO) as photo-initiator, and tri-fluoroethyl acrylate (3F-AA) and 1,6-hexanediol diacrylate (HDDA) as mono-and multifunctional diluents, respectively. When the mass ratio of P5F-AA/3F-AA/HDDA binder matrix was 1:1:0.5, the sample exhibited maximal mechanical strength of 6.56 MPa with elongation at break of 13.38%, which was due to the introduction of HDDA effectively increasing the "entanglement" between molecular chains. Thermogravimetric analysis (TGA-DTG) was utilized to evaluate the ability to decompose thermally of the binder matrix, and the results showed the initial degradation temperature started at nearly 181 C and two consecutive stages in thermal decomposition. Overall, the obtained results from the different techniques suggested that P5F-AA/3F-AA/HDDA binder matrix may be a photocurable reactive ink for 3D-printed propellants, which would provide a certain reference value and guiding importance for design of reactive inks.

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Thermal degradation, kinetic and correlation models of poly(vinylidene fluoride–chlorotrifluoroetheylene) copolymers

Cited by 37 publications

References 38 publications

Investigations on Chemical, Thermal Decomposition Behavior, Kinetics, Reaction Mechanism and Thermodynamic Properties of Aged TATB

Investigations on Chemical, Thermal Decomposition Behavior, Kinetics, Reaction Mechanism and Thermodynamic Properties of Aged TATB

Rheological characterization and modeling of vulcanization kinetics of natural rubber/starch blends

Preparation and characterization of photocurable fluorinated polyether‐based reactive inks

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