Structure-Engineered Mesoporous AlSi/P(VDF-HFP) Energetic Composites with Diffusion-Enhanced Reactivity

Area of Science:

• Materials Science
• Chemical Engineering
• Energetic Materials

Background:

• Aluminum (Al)-based alloys are key solid fuels for energetic composites (ECs).
• Their energy release efficiency is often limited by slow diffusion-controlled reaction kinetics.
• Improving reaction kinetics is crucial for enhanced EC performance.

Purpose of the Study:

• To design and synthesize a novel functionalized mesoporous AlSi alloy fuel.
• To form AlSi/P(VDF-HFP) energetic composites with enhanced reactivity.
• To investigate the structure-property relationships governing the improved combustion.

Main Methods:

• Sequential etching and fluorination strategy for AlSi alloy fabrication.
• Formation of AlSi/P(VDF-HFP) energetic composites.
• X-ray Photoelectron Spectroscopy (XPS) for surface analysis.
• Molecular Dynamics (MD) simulations for interaction analysis.
• Ignition and closed-bomb tests for performance evaluation.

Main Results:

• Mesoporous AlSi alloy effectively overcomes diffusion limitations in ECs.
• The mesoporous Si framework catalyzes P(VDF-HFP) decomposition and facilitates gas transport.
• Fluorinated surfaces enhance binding with P(VDF-HFP), increasing reaction heat.
• Reduced activation energy and significantly improved combustion performance and pressurization.

Conclusions:

• Structure-engineered mesoporous AlSi alloy fuels offer a viable pathway to enhance EC reactivity.
• The synergistic effects of mesoporosity and surface fluorination are key to improved performance.
• This approach provides an accessible method for developing high-performance energetic materials.