Abstract
Nitrocellulose (NC), a highly energetic compound, is widely used in nitrolacquer, celluloid, binder, propellants, and explosives. Many studies have focused on the inflammability and instability of NC, but few have investigated its use as a propellant binder. To optimize the properties of NC as a propellant binder, this study introduced 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Bmim][NTf2]) as an additive. This study focuses on the thermal pyrolysis behavior and decomposition mechanism of pure NC (NC-P), NC-NTf2 (i.e., NC mixed with [Bmim][NTf2]), and NC-NTf2-eth (i.e., NC mixed with 30% [Bmim][NTf2] and 70% ethanol). First, the thermal degradation processes of NC and [Bmim][NTf2] were investigated using thermogravimetric analysis. In addition, the essential thermodynamic parameters of NC-P, NC-NTf2, and NC-NTf2-eth were obtained by differential scanning calorimetry, and the apparent activation energies were evaluated using the Starink method and Friedman method. The results show that NC-NTf2 has low onset decomposition temperature, low activation energy, and high energy release rate. Moreover, NC-P, NC-NTf2, and NC-NTf2-eth were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy to verify and interpret the thermal analysis results obtained.
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Abbreviations
- t :
-
Reaction time (s)
- α :
-
Conversion degree (mass%)
- f(α):
-
Differential form of mechanism function
- G(α):
-
Integral form of mechanism function
- k :
-
Reaction rate constant (s−1)
- A :
-
Pre-exponential factor (s−1)
- E a :
-
Apparent activation energy (kJ mol−1)
- R :
-
Universal gas constant (8.314 J mol K−1)
- β :
-
Heat rate (K min−1)
- T 0 :
-
Onset decomposition temperature (°C)
- T p :
-
Peak decomposition temperature (°C)
- T ed :
-
End decomposition temperature (°C)
- r :
-
Residual mass (mass%)
- Q :
-
Reaction heat release (mJ)
- ∆H :
-
Reaction heat (J g−1)
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Acknowledgements
The authors are very grateful for the financial support received from the National Key R&D program, “Study on Safety Control Technology of Storage and Transportation Network of Hazardous Chemicals in Chemical Parks by Multi Species Coupling” (No. 2016YFC0801500), the National Natural Science Foundation of China (21436006, 51834007, 51874181, 51804167), the Jiangsu Natural Science Foundation (BK20150953), the Major Projects of the Natural Science Research for Colleges in Jiangsu Province (17KJA620002), Graduate Student Scientific Research Innovation Project of Jiangsu Province (KYCX19_0829), and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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Liang, X., Jiang, H., Pan, X. et al. Analysis and characterization of nitrocellulose as binder optimized by 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. J Therm Anal Calorim 143, 113–126 (2021). https://doi.org/10.1007/s10973-019-09123-6
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DOI: https://doi.org/10.1007/s10973-019-09123-6