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Core@Double-Shell Structured Energetic Composites with Reduced Sensitivity and Enhanced Mechanical Properties.

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PubMed
Summary

A novel core@double-shell energetic composite using 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) with nano-TATB and polydopamine shells significantly reduces sensitivity while enhancing performance and mechanical properties.

Keywords:
HMXPDATATBcore@double-shell structureinterfacial reinforcementmechanical propertiessensitivity

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Energetic Materials

Background:

  • 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) is a powerful energetic material but suffers from high sensitivity.
  • Reducing the sensitivity of HMX without compromising its performance is crucial for safe handling and application.
  • Core-shell structures offer a promising strategy for modifying the properties of energetic materials.

Purpose of the Study:

  • To develop a novel core@double-shell (CDS) HMX-based energetic composite.
  • To reduce the sensitivity and enhance the performance and mechanical properties of HMX.
  • To investigate the effect of nano-1,3,5-triamino-2,4,6-trinitrobenzene (nano-TATB) and polydopamine (PDA) shells on HMX properties.

Main Methods:

  • Fabrication of CDS HMX particles using ultrasonic and immersion methods.
  • Characterization of HMX@TATB@PDA particles and their corresponding polymer-bonded explosives (PBXs).
  • Evaluation of sensitivity (impact), thermal stability (phase transition), mechanical properties, and interfacial interactions.

Main Results:

  • The CDS structure effectively reduced impact sensitivity from 5 J (physical mixture) to 10 J for HMX@TATB@PDA particles.
  • Polydopamine coating increased the β-δ phase transition temperature of HMX from 197.0 to 212.8 °C.
  • PBXs based on CDS particles exhibited improved mechanical strength, roughness, storage modulus, and creep resistance due to enhanced interfacial interactions.

Conclusions:

  • The developed CDS HMX-based energetic composite offers a viable approach to creating safer and more robust energetic materials.
  • The combination of nano-TATB and PDA shells effectively mitigates HMX sensitivity and enhances its overall performance.
  • The enhanced interfacial interactions in CDS structured particles lead to superior mechanical properties in PBXs.