Jinhao Zhang,Wenjia Hao,Yulan Song,Tao Huang,Rufang Peng,Bo Jin
Weak interaction is an important force widely existing in material molecules, which may affect the structure and even properties of materials , mainly including π stacking, hydrogen bond network and van der Waals force, etc. The π-stacking and hydrogen bonding networks in energetic materials have a particularly significant impact on their safety. 1,1′-dihydroxy-azobistetrazole (H 2 AzTO) with abundant hydrogen bond acceptor and dimethyl biguanide (DMG) with abundant hydrogen bond donor was selected as starting materials, then a new energetic salt with strong hydrogen bond network structure, azobistetrazole-1,1′-dioxy-dimethyl biguanide (DMGAzTO), was synthesized through an acid-base neutralization reaction. The structure of DMGAzTO was characterized by FT-IR, 1 H NMR, 13 C NMR, EA , and SC-XRD, and the thermal stability and non-isothermal thermal decomposition reaction kinetics of DMGAzTO were studied by DSC and TGA methods. The HOF , detonation velocity, and pressure ( D , P ) were calculated by Born-Haber cycle and K - J empirical formula. The friction and impact sensitivity ( FS and IS ) of the compound were examined using a BAM sensitivity tester. Results show that the DMGAzTO salt belongs to the 1:1 type with a molecule of bound water; the peak temperature of thermal decomposition is 502 K; the thermal weight loss rate is 82%; the theoretically calculated D and P are 8217 m s −1 and 27.1 GPa, and the FS and IS are 30 J and 360 N, respectively.
3,4-Dinitrofurazanfuroxan (DNTF) is widely used in fusion-cast-based explosive carriers owing to its low melting point, high energy, and excellent stability. To reduce the susceptibility of DNTF and improve the thermal properties, core–shell composites (DNTF@PDA@HTPB) were synthesized using the oxidative self-polymerization reaction of dopamine. The results showed that hydroxyl-terminated polybutadiene (HTPB) was tightly coated on the surface of DNTF@PDA crystals, and the crystal structure of the high-energy crystals did not experience any significant changes during the encapsulation process. Compared with the raw DNTF, the thermal decomposition of DNTF in the DNTF@PDA and DNTF@PDA are delayed by 13.3℃ and 17.1℃, respectively. This phenomenon indicates that the thermal stability of DNTF@PDA and DNTF@PDA@HTPB composites is improved. The ignition speed of DNTF@PDA@HTPB is faster, and the flame activity is more vigorous. Meanwhile, the friction susceptibility of DNTF@PDA@HTPB is reduced by 44% compared to DNTF, and the impact susceptibility is significantly reduced by 75%. This study provides a new idea to improve fused-cast explosives' structure and combustion performance.
危险品化学品经营许可证（带存储）