Interaction and mechanism of nitrocellulose and N-methyl-4-nitroaniline by isothermal decomposition method
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The influence of N-methyl-4-nitroaniline (MNA) on the thermal stability of nitrocellulose (NC) was investigated via an isothermal decomposition dynamics research method. The Arrhenius equation and model-fitting were used to calculate the thermal decomposition kinetic parameters of NC and MNA/NC (3 wt%) composite. Results showed that the thermal decomposition activation energy of NC/MNA (3 wt%) was significantly increased compared with that of pure NC, indicating that the thermal stability of NC was increased with stabilizer MNA addition. Subsequently, the storage life of NC and MNA/NC (3 wt%) composite was estimated using Berthelot equation. It was found that if the decomposition extent reaches 0.1% as the end of life criterion, 3 wt% stabilizer MNA addition significantly extended the storage life of NC from 10.57 to 24.9 years at ambient temperature (298.15 K) with the life extension rate reaching 135.6%. Furthermore, the intermediate product produced by MNA and NC action was extracted and characterized via UV–Vis, HPLC, 1H NMR, FT-IR, and LC–MS, and a possible stabilization mechanism of MNA to NC was proposed.
KeywordsNitrocellulose N-methyl-4-nitroaniline Stabilizer Isothermal decomposition Storage life
We are grateful for financial support by the Science Challenge Project (Project No. TZ2018004), the Natural Science Foundation of China (21875192), Key Projects of the Pre-research Fund of the General Armament Department (Project No. 6140720020101), National Defense Technology Foundation Project (Project No. JSJL2016404B002) and the Institute of Chemical Materials, China Academy of Engineering Physics (Project No. 18zh0079).
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