The work aims to understand how natural aging affects the compatibility of l,l-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 Spec-troscopy,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 mix-tures 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 ob-served 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 under-standing 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.
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