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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.28 SNIP: 0.421 CiteScore™: 0.9

ISSN Imprimir: 2150-766X
ISSN On-line: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2012005396
pages 455-468

BENEFITS OF THE RESOLV PROCESS IN FORMING POLYMER-COATED, ULTRAFINE RDX PARTICLES

Jonathan T. Essel
Department of Mechanical and Nuclear Engineering, Pennsylvania State University, University Park, PA 16802
Kenneth K. Kuo
Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA
James H Adair
Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA 16802
Anna R. Merritt
Naval Air Warfare Center Weapons Division, China Lake, CA
Joshua Carter
Naval Air Warfare Center Weapons Division, China Lake, CA

RESUMO

This paper investigates several benefits of using the rapid expansion of a supercritical solution into a liquid solvent (RESOLV) process to form stable, ultrafine RDX particles dispersed in a liquid medium. The first benefit of the RESOLV process is that polymer coatings involved in the process provide dispersion to prevent agglomeration of the RDX particles. This benefit is necessary because experimental evidence suggests uncoated particles exhibit instability toward agglomeration and computer code calculations using the software program STABIL were used to show that initially formed RDX particles grow twice as large in as little as 8 min if unprotected in aqueous suspension. Second, the sensitivity of polyvinylpyrrolidone (PVP)−coated particles produced through the RESOLV process was investigated. As an experimental control, acetone-recrystallized RDX was used for sensitivity testing as well. The ERL impact sensitivity of PVP-coated particles was 19 cm and 30 cm with a wide standard deviation for acetone-recrystallized RDX. The ABL friction sensitivity of the PVP-coated RDX was 521 lb and 355 lb for the recrystallized RDX. Neither the PVP-coated RDX nor the acetone-recrystallized RDX particles initiate when subjected to a 0.25 J spark stimulus in the NAWC ESD sensitivity test. Finally, initial investigations were made into using energetic polymers as a potential dispersant with the RESOLV process. The solubility of the energetic polymer poly-3-(nitrato-oxetane) (PNO) was quantified in chloroform. The solubility was determined to be ~15 mg PNO/g solution. This solubility is approximately 100 times higher than the solubility of RDX in chloroform. Therefore, PNO and chloroform solutions could be used to coat and stabilize newly formed nanosized RDX particles.


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