Experimental and theoretical studies on stability of new stabilizers for N-methyl-P-nitroaniline derivative in CMDB propellants

The effects of various aniline stabilizers on the thermal stability of nitrocellulose (NC) were investigated via isothermal thermal decomposition dynamics. The pressuretime curves of NC/stabilizer composites were found to have a distinct inflection point, which was not observed on the pressure-time curves of NC. The effects of stabilizers on the isothermal thermal decomposition kinetics of NC were evaluated using Arrhenius equation and model-fitting method, and the effect of stabilizers on the storage time of NC was estimated using Berthelot equation. Results showed that the activation energy of NC/MNA, NC/ENA, NC/i-PNA, and NC/n-BNA before the inflection point were 162.9, 153.3, 147.4, and 150.6 kJ mol À 1 , respectively, which were significantly increased compared with that of pure NC (144.7 kJ mol À 1 ). Furthermore, the time required for the decomposition extent of NC/MNA, NC/ENA, NC/i-PNA, and NC/n-BNA to reach 0.1 % were 24.9, 11.2, 16.7, and 11.2 years, respectively, at 298.15 K, which was longer than that required of NC (10.6 years). UV-vis revealed that the stabilizers were almost consumed when the NC/stabilizer thermal decomposition pressure-time curve reached the inflection point. Based on the above results, the stability order was MNA > i-PNA > ENA > n-BNA as the criterion for time of the inflection point.

Section: Effect Of Stabilizers On the Isothermal Thermal Decomposition Kinetics Of Ncmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effects of Aniline Stabilizers on Nitrocellulose Based on Isothermal Thermal Decomposition

Luo

Jin

Chai

et al. 2020

“…Excellent research works all over the world have focused on the synthesis of new aniline-based stabilizers [14,15], the understanding of the interactions occurred between them [16][17][18], and the evaluation of the stability and performance of related energetic formulations [2,7,8,13,14], but without sufficiently addressing an exhaustive investigation about the compatibility issues for such combinations. Consequently, a number of stabilizers did not satisfy the development of nitrate-ester based energetic materials.…”

Section: Introductionmentioning

confidence: 99%

New Insights on the Compatibility of Nitrocellulose with Aniline‐Based Compounds

Trache

Tarchoun

Chelouche

et al. 2019

In this paper, the compatibility of nitrocellulose (NC) with some aniline‐based stabilizers was studied in order to detect any interaction between these materials. Both thermal techniques [differential scanning calorimetry (DSC) and vacuum stability test (VST)], and supplementary non‐thermal techniques [Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD) and densimetry] were used. The thermal and non‐thermal measurements showed that NC was highly compatible with N‐(2‐methoxyethyl)‐p‐nitroaniline (MENA) and diphenylamine (DPA), while a degree of incompatibility is indicated for N‐(2‐acetoxymethyl)‐p‐nitroaniline (ANA). The compatibility of the different mixtures was further probed by the kinetic investigation, and the activation energy and the pre‐exponential factors were computed. A detailed discussion and comparison of the compatibility results from all the methods are made.

“…In order to evaluate the uncertainty of stabilizer content in equation 4, a Kline McClintock uncertainty analysis was applied. In general, if n measurements x n are being made, each with a measurement tolerance of ω n , and a function F is calculated using the measured values, then the uncertainty or tolerance in the calculation can be determined as Equation 10 [33]:…”

Section: Uncertainty Analysismentioning

confidence: 99%

“…Therefore, studies of NEPE storage performance have been significant in avoiding economic losses caused by performance failures or premature retirements. During the ageing process of the NEPE propellant, NG decomposes and releases nitrous oxides and consequently accelerates the degradation of the nitrate ester [10][11][12][13][14]. As a consequence, changes in the physical, chemical, mechanical, ballistic, and thermal properties of the propellants occur.…”

Section: Introductionmentioning

confidence: 99%

A Study on Consumption and Characterization of Stabilizer Content of NEPE Propellant via FTIR

Tao

Sui

et al. 2019

Nitrate ester plasticised polyether (NEPE) propellants, a kind of high‐energy solid propellant, were tested for their stabilizer content and Fourier transform infrared spectrum (FTIR) to study their ageing performance. On the one hand, a stabilizer consumption equation containing the ageing temperature, stabilizer content, and ageing time was established by analyzing the data of stabilizer content of NEPE aged at high temperatures (328, 333, 338, 343, 348, and 353 K). On the other hand, it was found that the second derivative spectral absorbance of 1598 cm−1 has a high linear correlation to the stabilizer content of NEPE propellant, and an equation, which can be used to calculate the stabilizer content of NEPE with FTIR data, was established. Thereafter, to prove the universality and accuracy of these two equations, FTIR testing of NEPE aged at room temperature (298 K) was carried out. Accordingly, the two other equations for stabilizer consumption at room temperature were derived by the FTIR data and the stabilizer consumption equation, respectively. They were consistent and the universality and accuracy of these equations were proven, and the feasibility of non‐destructive monitoring methods for NEPE propellants via FTIR was experimentally verified.