自然老化对FOX-7基双元混合物相容性的影响

目的 掌握自然老化如何影响1,1-二氨基-2,2-二硝基乙烷(FOX-7)基双元混合物的相容性，揭示老化过程对其相容性的潜在影响。方法 采用热分析技术(差示扫描量热法，DSC)和非热分析技术(傅里叶变换红外光谱，FTIR)，对老化前后FOX-7基双元混合物的热分解特性和分子结构特征进行评估。利用DSC测得混合物和单质FOX-7的DSC初始分解峰温，对FOX-7与8种含能材料和4种惰性材料的相容性进行评估，再结合FTIR的测试结果辅助说明混合物分子结构的变化。结果 DSC热流曲线显示，除FOX-7/RDX混合物外，其他研究对象在老化前后均展现出良好的相容性。然而，以FOX-7/CL-20为代表的混合物在老化后的最大放热峰温出现明显变化，表明老化对这些混合物的相容性产生了影响。在FTIR光谱分析中观察到的官能团变化进一步表明，FOX-7与RDX、CL-20、AP、HTPB、DOS或WAX等组成的双元体系在老化过程中发生了化学反应。结论 本研究的发现对理解和评估老化过程对FOX-7基双元混合物相容性的影响具有重要意义，可用于指导FOX-7基含能材料长期储存和使用中的安全设计。

Effect of Natural Aging on Compatibility of FOX-7 Based Binary Mixtures

The work aims to understand how natural aging affects the compatibility of 1,1-diamino-2,2-dinitroethane (FOX-7) based binary mixtures, and reveal the potential impact of aging on their compatibility. In the work, thermal analysis techniques (Differential Scanning Calorimetry, DSC) and non-thermal analysis techniques (Fourier Transform Infrared Spectroscopy, FTIR) were employed to assess the thermal decomposition characteristics and molecular structural features of FOX-7 based binary mixtures before and after aging. DSC was used to measure the initial decomposition peak temperature of the mixtures and pure FOX-7. A comprehensive assessment on the compatibility of FOX-7 with eight energetic materials and four inert materials was conducted, supplemented by FTIR results to explain the molecular structural changes in the mixtures. The DSC thermograms showed that except for the FOX-7/RDX mixture, all other studied objects exhibited good compatibility before and after aging. However, mixtures represented by FOX-7/CL-20 showed significant changes in the maximum exothermic peak temperature after aging, indicating that aging affected the compatibility of these mixtures. The functional group changes observed in the FTIR spectral analysis further suggested that chemical reactions occurred in the binary systems comprising FOX-7 and RDX, CL-20, AP, HTPB, DOS, or WAX during the aging process. The findings of this study are significant for understanding and assessing the impact of aging on the compatibility of FOX-7 based binary mixtures, and can guide the safe design for long-term storage and use of FOX-7 based energetic materials.