Energetic properties of core–shell B@PVDF/AP composite micro-units prepared by electrostatic spraying technology

Qin, Yang; Huang, Xinran; Jiang, Dawei; Zhou, Tong; Yu, Haomiao; Song, Ye; Li, Fengsheng; Liu, Jie

doi:10.1016/j.cej.2024.154379

Cited by 2 publications

References 49 publications

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Dye Decorated Ammonium Perchlorate with Fast Decomposition and High Safety Performance

Liu,

Wang,

Zhao

et al. 2024

Adv Funct Materials

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Enhancing the thermal decomposition efficiency and safety of ammonium perchlorate (AP) is of far‐reaching significance in composite propellants. Most catalysts act well on the thermal decomposition of AP, however, synergistically achievements of fastened decomposition and improved mechanical safety are still in challenge. Herein, neutral red (NR) is selected from typical dyes through theoretical calculations, acting as an organic decoration of AP crystal with improved performances. Among the four organic dyes, NR demonstrated the highest adsorption energy and evident charge transfer at the interface. Following preparations through a freeze‐drying technique obtained a quasi‐homogeneous energetic composite (NR‐AP‐5%). The large interaction force between NR and AP promoted the rupture of chemical bonds between Cl and O as proved by TG‐MS, showing excellent energy‐release performance with the decreased exothermic peak from 437.0 to 355.5 °C. Correspondingly, the activation energy is reduced from 213.59 to 107.72 kJ mol−1, with largely increased heat release from 447.29 to 1014.86 J g−1. In addition, the inert decoration of NR endowed considerable advances in the safety performances of AP, achieving remarkably improved impact and friction sensitivity of 35 J and 288 N, respectively. This unique assembly structure provides a novel strategy to achieve high‐effective catalysis for functional propellants.

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Dye Decorated Ammonium Perchlorate with Fast Decomposition and High Safety Performance

Liu,

Wang,

Zhao

et al. 2024

Adv Funct Materials

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Synergistic effect of AP/KP composite oxidizers prepared by electrostatic spraying and promotion of aluminum combustion performance

Sun,

Li,

Wang

et al. 2024

Preprint

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In order to solve the problems of low effective oxygen content, low density and high mechanical sensibility of ammonium perchlorate (AP) for propellant, potassium perchlorate (KP), which has a higher density and greater effective oxygen content, was introduced. An AP/KP composite oxidizer was prepared using electrostatic spraying. The morphology, structure, thermal properties, safety, and combustion performance of the samples were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and a quadruple coupling technique (TG-DSC-FTIR-MS). Comparative studies were performed with raw materials and physically mixed samples. The results indicate that the crystal structures of AP and KP remained unchanged in the composite oxidizers prepared using different methods. The electrostatic spray samples exhibited significantly improved safety compared to raw AP and physically mixed samples, with friction sensitivity reduced by 36% and 16%, respectively. Thermal analysis revealed that the electrostatic spray samples significantly enhanced the high-temperature decomposition of AP and KP, with decomposition peaks reduced by 49.15°C and 9.67°C, respectively. Additionally, the electrostatic spray method significantly reduced the activation energy of KP's thermal decomposition from 444.34–436.84 kJ·mol− 1 to 225.07–228.28 kJ·mol− 1. Compared to raw and physically mixed samples, the electrostatic spraying method reduced the ignition delay time of the composite oxidizer, increased the aluminum powder combustion rate, and enabled complete combustion of the Al powder. The electrostatic spraying method, with its adjustable process parameters and controllable sample morphology, enhances the overall performance of the composite oxidizer.

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Energetic properties of core–shell B@PVDF/AP composite micro-units prepared by electrostatic spraying technology

Cited by 2 publications

References 49 publications

Dye Decorated Ammonium Perchlorate with Fast Decomposition and High Safety Performance

Dye Decorated Ammonium Perchlorate with Fast Decomposition and High Safety Performance

Synergistic effect of AP/KP composite oxidizers prepared by electrostatic spraying and promotion of aluminum combustion performance

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