Song Jiaxing, Guo Tao, Ding Wen, Yao Miao, Bei Fengli, Zhang Xiaonan, Huang Junyi, Fang Xiang
College of Field Engineering, Army Engineering University of PLA Nanjing 210007 China
School of Chemical, Nanjing University of Science and Technology Nanjing 210094 China.
RSC Adv. 2019 Aug 13;9(44):25266-25273. doi: 10.1039/c9ra04425f.
To explore the effect of the addition of poly(vinylidene fluorine) (PVDF) to a nanothermite system, an Al/MnO/PVDF energetic nanocomposite was prepared using an electrospray method, Al/MnO nanothermite was prepared as a control group. Then, the energetic nanocomposite and nanothermite were tested and analyzed by XRD, FE-SEM and TG-DSC, and the reaction products were collected. The results show that energetic nanocomposite would have three obvious exothermic peaks in the range of room temperature to 800 °C with a total more than 1700 J g heat release while the control experiment, Al/MnO nanothermite, could be found one exothermic peak with a 1100 J g heat release. The residues are mainly MnAlO, MnF and AlF which indicates that Al/MnO/PVDF energetic nanocomposite could make full use of manganese oxide. Finally, thermal analysis experiments were carried out under different heating rates to calculate the activation energy. The calculation results show that the addition of PVDF could significantly reduce the activation energy, which would help spark the thermite at comparatively low energy and temperature.
为探究向纳米铝热剂体系中添加聚偏氟乙烯（PVDF）的效果，采用电喷雾法制备了Al/MnO/PVDF含能纳米复合材料，制备Al/MnO纳米铝热剂作为对照组。然后，通过X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）和热重-差示扫描量热法（TG-DSC）对含能纳米复合材料和纳米铝热剂进行测试分析，并收集反应产物。结果表明，含能纳米复合材料在室温至800℃范围内会出现三个明显的放热峰，总放热量超过1700 J/g，而对照实验Al/MnO纳米铝热剂只有一个放热峰，放热量为1100 J/g。残渣主要为锰铝氧化物、氟化锰和氟化铝，这表明Al/MnO/PVDF含能纳米复合材料能够充分利用氧化锰。最后，在不同加热速率下进行热分析实验以计算活化能。计算结果表明，PVDF的添加可显著降低活化能，这有助于在相对较低的能量和温度下引发铝热反应。
