Performance characterization of surface-coated ultrafine hexanitrostilbene-IV by experiment and simulation.

Area of Science:

• Materials Science
• Chemical Engineering
• Energetic Materials

Background:

• Hexanitrostilbene-IV (HNS-IV) is a crucial explosive for detonation applications due to its stability and resistance.
• Ultrafine HNS-IV exhibits poor flowability and static electricity, hindering accurate mass loading and density control.
• Addressing these limitations is vital for enhancing the safety and reliability of HNS-IV in practical use.

Purpose of the Study:

• To overcome the flowability and moldability challenges of ultrafine HNS-IV particles.
• To develop a modified HNS-IV formulation with improved static electricity and handling characteristics.
• To evaluate the performance of the modified HNS-IV using comprehensive testing.

Main Methods:

• Molecular dynamics (MD) simulations were employed to screen and select a high-performance, heat-resistant binder.
• Ultrafine HNS-IV was modified using the solvent evaporation method with the selected binder and graphite as an antistatic agent.
• Comprehensive characterization included morphology, composition, differential scanning calorimetry (DSC), repose angle, bulk density, explosion point, and charge amount analysis.

Main Results:

• The modified HNS-IV sample, incorporating a heat-resistant binder and graphite, exhibited improved flowability and reduced static electricity.
• Characterization confirmed the successful modification and demonstrated the potential for enhanced performance.
• Testing revealed significant improvements in properties critical for explosive applications.

Conclusions:

• The developed modification strategy effectively addresses the flowability and static electricity issues of ultrafine HNS-IV.
• The use of molecular dynamics simulations proved effective in selecting suitable binders for energetic materials.
• The modified HNS-IV shows promise for improved safety, accuracy, and handling in detonation devices.