ABSTRACT

In this study, a core-shell structure of MgAl-CuO nanothermite coated with ammonium perchlorate (KClO₄@MgAl-CuO) has been successfully prepared by a solvent/non-solvent synthetic method, and its catalytic influence on the thermo-kinetic behavior of nitrated cellulose (NC)/diethylene glycol dinitrate (DEGDN) composite has been studied using differential scanning calorimetry (DSC) combined with three isoconversional kinetic models. Beforehand, scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR) findings showed that the prepared KClO₄@MgAl-CuO particles were uniformly distributed within the NC/DEGDN matrix. Moreover, the obtained DSC thermograms indicated that the thermolysis of the developed NC/DEGDN composite was shifted to a lower temperature after the incorporation of the coated nanothermite. Additionally, a significant decrease in the activation energy (from approximately 136 to 94 kJ/mol) was also observed, demonstrating that the presence of the KClO₄@MgAl-CuO nanothermite catalyzed the decomposition of NC/DEGDN propellant. Therefore, this study could serve as a reference for future research on the coated metastable intermolecular composites and their effects on double-base propellants.

摘要

本研究采用溶剂/非溶剂合成方法成功制备了高氯酸铵包覆的MgAl-CuO纳米铝热剂（KClO ₄ @MgAl-CuO）的核壳结构，并探讨了其对热动力学行为的催化影响。使用差示扫描量热法 (DSC) 结合三种等转化动力学模型研究了硝化纤维素 (NC)/二硝酸二甘醇 (DEGDN) 复合材料的性能。事先，扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）结果表明制备的KClO ₄@MgAl-CuO 颗粒均匀分布在 NC/DEGDN 基质内。此外，获得的 DSC 热分析图表明，在加入涂覆的纳米铝热剂后，所开发的 NC/DEGDN 复合材料的热解转移到较低的温度。此外，还观察到活化能显着降低（从约136 kJ/mol降至94 kJ/mol），表明KClO ₄ @MgAl-CuO纳米铝热剂的存在催化了NC/DEGDN推进剂的分解。因此，本研究可为今后研究包覆亚稳分子间复合材料及其对双基推进剂的影响提供参考。