Ameliorating the performances of 3,4-bis(4'-nitrofurazano-3'-yl)furoxan (DNTF) by establishing tannic acid (TA) interface layer on DNTF surface

Through the self-assembly reaction of tannic acid (TA), TA and TA-Cu interface layers are established on 3,4-bis (4 & PRIME;-nitrofurazano-3 & PRIME;-yl)furoxan (DNTF) surface to ameliorate its performances. The coating effects of TA and TA Cu layer on DNTF surfaces are characterized by scanning electron microscope (SEM). The interactions between DNTF surfaces and TA are analyzed by molecular dynamics (MD) simulations. The properties of DNTF@TA and DNTF@TA-Cu composites are characterized by differential scanning calorimetry (DSC), accelerating rate calorimeter (ARC), explosion point, vacuum deflation volume and mechanical sensitivities. The residues of DNTF@TA and DNTF@TA-Cu composites after explosion are collected and then characterized by SEM and X-ray diffraction (XRD) to study the catalytic effects of Cu. The catalytic mechanism of CuO on DNTF are studied by density functional theory (DFT). The study results show that TA and TA-Cu layer have good coating effects on DNTF surface. Compared with pure DNTF, the explosion points are increased while the vacuum deflation volumes and mechanical sensitivities are decreased for both DNTF@TA and DNTF@TA-Cu, illustrating that the safeties of DNTF@TA and DNTF@TA-Cu composites are improved. In addition, the initial decomposition temperature and peak temperature of DNTF@TA and DNTF@TA-Cu obtained by DSC are increased, demonstrating that the thermal stabilities of DNTF@TA and DNTF@TA-Cu are increased. Compared with pure DNTF and DNTF@TA, the decomposition period of DNTF@TA-Cu composite is reduced, illustrating that Cu can enhance the decomposition rate of DNTF. Compared with pure DNTF, the energy barrier of initial decomposition of CuODNTF is decreased, implying that CuO can catalyze the decomposition of DNTF.