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Abstract
The versatility of the Spray Flash Evaporation (SFE) has been extended within the introduction of solid and viscous polymers in solvent. Those polymers are food additives namely polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG); both additives were successfully used to control crystallization steps, thus the particle size and shape of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX). The role of PVP as nucleation and growth inhibitor allowed the formation of spherical RDX particles with an average size of 160nm; we found that only 1wt% of PVP per gramme of RDX is needed to reach that size and further addition reduces only the dispersion. The PEG triggered the nucleation of RDX with a low rate and so promoted the growth of RDX particles up to 5μm. Despite a lower thermal stability, the synthesized energetic composites exhibit reduced sensitives towards electrostatic discharge, friction and impact.
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