Experimental study on thermal decomposition kinetics of natural ageing AP/HTPB base bleed composite propellant

Zhang, Ling Ke; Zheng, Xiang yang

doi:10.1016/j.dt.2018.04.007

Cited by 16 publications

(7 citation statements)

References 9 publications

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“…The thermal decomposition of pure AP depicts an endotherm at 240 °C due to phase transition and two exotherms at about 300 °C and 400 °C, which are termed as low and high temperature decomposition exotherm respectively [24,25]. A similar trend is observed in DSC for all the compositions, i. e. AP phase transition is observed at 247-249 °C (close to that of pure AP) followed by two exotherms.…”

Section: Thermal Propertiessupporting

confidence: 57%

Studies of Energetic and Non‐Energetic Plasticizers for Nitrile Butadiene Rubber based CSP

Singh

Bhongale

Gupta

et al. 2022

Propellants Explo Pyrotec

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Binders with energetic plasticizers besides boosting energy also enhance the structural integrity of the propellant composition. In recent energetic compositions, energetic plasticizers such as NG, BTTN, DEGDN and TEGDN replace conventional plasticizers as they possess positive heat of the explosion and energetic groups in the same molecule. Energetic groups impart enhanced potential for delivering superior performance. In the present paper, a comparative study is done between NBR based composite solid propellant formulations with energetic (DEGDN and TEGDN) and non-energetic (DAP and DBP) plasticizers. The predicted theoretical performance of non-aluminized and aluminized propellants shows that DEGDN/TEGDN based propellants are more energetic than that of DAP/DBP propellants. The viscosity (768 Pa.s), density (1748 kg/m 3 ), calval (5426.64 J/g), burning rate (4.21 mm/s) of DBP and DAP based propellants are on the lower side than DEGDN and TEGDN based propellants. End of mix viscosity and burning rate of energetic plasticizer based compositions is approximately twice of the inert plasticizer based compositions. There is up to 60 % increase in TS and modulus while elongation is reduced by 20 %. Pressure index increases from 0.159 to 0.310 for DBP to DEGDN based propellant. The study shows that high performance high burning rate propellant can be designed with DEGDN.

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Section: Thermal Propertiessupporting

confidence: 57%

Studies of Energetic and Non‐Energetic Plasticizers for Nitrile Butadiene Rubber based CSP

Singh

Bhongale

Gupta

et al. 2022

Propellants Explo Pyrotec

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“…A large number of analytical methods are available nowadays which can be used to determine the kinetic parameters of distinct solid-phase reactions evaluation. The kinetic parameters can be determined either isothermally or nonisothermally by using two main methods: isoconversional (model-free) and model-fitting methods [ 25 , 26 ].…”

Section: Methodsmentioning

confidence: 99%

Thermal Kinetics of a Lignin-Based Flame Retardant

Liang

Wang

et al. 2020

Polymers

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In order to improve the thermal property of epoxy resin (EP), a lignin-based flame retardant was prepared. Focusing on the lignin-based flame retardant, this paper investigates its pyrolysis behavior and kinetics via a thermogravimetric analyzer coupled with Fourier transform infrared spectrometry (TG–FTIR). Based on the FTIR result, which showed a peak at 1222 cm−1, it was assigned a syringyl structure. Its absorption peak intensity was enhanced and this meant that the phenolization of the lignin was successful. Thermogravimetry/derivative thermogravimetry (TG/DTG) results showed that the carbon residues of F-lignin and F-lignin@APP were reduced to 33.5% and 37.5%, respectively. In addition, the maximum decomposition rate of F-lignin@APP20/EP is 11.8%/min, which is 8%/min and 4.7%/min lower than for EP and Al-lignin, respectively. The char residue of F-lignin@APP20/EP is 32.5%, which is much higher than for EP. Lower decomposition rate and higher char residue indicate the improvement of thermal stability of EP by F-lignin@APP. Moreover, the kinetics of Al-lignin20/EP and F-lignin@APP20/EP were conducted by two kinetic methods: Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS). It was concluded that the pyrolysis process of Al-lignin 20/EP and F-lignin@APP 20/EP could be divided into three stages, while the value and growth rate of the activation energy of F-lignin@APP 20/EP were much higher than that of Al-lignin 20/EP in stage III.

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“…A cut-off temperature was selected for hot-spot density calculation based on the decomposition temperature of HTPB and AP. Decomposition of HTPB binder starts at around 673 K whereas at 513 K a phase change occurs in the AP crystals [66]. In this work the maximum temperature for comparison is taken to be 500 K, which is temperature after which AP phase change starts to occur [66].…”

Section: Numerical Simulation Of Shock Behavior Of Htpb-ap Energetic ...mentioning

confidence: 99%

“…Decomposition of HTPB binder starts at around 673 K whereas at 513 K a phase change occurs in the AP crystals [66]. In this work the maximum temperature for comparison is taken to be 500 K, which is temperature after which AP phase change starts to occur [66]. It is observed that the maximum temperature, within the microstructure, decreases by more than 20 K by adding interface shock viscosity in the model.…”

Section: Numerical Simulation Of Shock Behavior Of Htpb-ap Energetic ...mentioning

confidence: 99%

The effect of interface shock viscosity on the strain rate induced temperature rise in an energetic material analyzed using the cohesive finite element method

Prakash

Gunduz

Tomar

2019

Modelling Simul. Mater. Sci. Eng.

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In this work, shock induced failure and local temperature rise behavior of a hydroxyl-terminated polybutadiene (HTPB)—ammonium perchlorate (AP) energetic material is modeled using the cohesive finite element method (CFEM). Thermomechanical properties used in the model were obtained from four different experiments: (1) dynamic impact experimental measurements for fitting a viscoplastic constitutive model, (2) in situ mechanical Raman spectroscopy (MRS) measurements of the separation properties for fitting a cohesive zone model, (3) a pulse laser induced particle impact experiment combined with the MRS for measurement of the interface shock viscosity, and (4) Raman thermometry experiments for measurement of HTPB, AP, and HTPB-AP interface thermal conductivity. HTPB-AP interface regions with high density of particles were found to be more susceptible to local temperature rise due to the presence of viscoplastic dissipation as well as frictional heating. The increase in the interface shock viscosity lead to a decrease in both the viscoplastic and frictional dissipation. This resulted in a decrease in the maximum temperature and the density of local regions with a maximum temperature rise within the HTPB-AP microstructure. A power law relation for the decrease in viscoplastic energy dissipation, temperature rise and the density of the local temperature rise with the interface shock viscosity was obtained.

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Experimental study on thermal decomposition kinetics of natural ageing AP/HTPB base bleed composite propellant

Cited by 16 publications

References 9 publications

Studies of Energetic and Non‐Energetic Plasticizers for Nitrile Butadiene Rubber based CSP

Studies of Energetic and Non‐Energetic Plasticizers for Nitrile Butadiene Rubber based CSP

Thermal Kinetics of a Lignin-Based Flame Retardant

The effect of interface shock viscosity on the strain rate induced temperature rise in an energetic material analyzed using the cohesive finite element method

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