Facile preparation and characterization of energetic hollow FOX-7/viton microspheres with improved thermal decomposition properties and reduced sensitivity. Issue 3 (3rd July 2022)

• Record Type: Journal Article
• Authors: Yang, Yue; Li, Xiaodong; Sun, Yantao; Zhao, Yue; Han, Yuanqi; Wang, Jingyu
• Is Part Of: Journal of energetic materials. Volume 40:Issue 3(2022)
• Page Start: 358
• Page End: 374
• Publication Date: 2022-07-03
• Subjects: 1, 1-diamino-2 -- 2-dinitroethylene (FOX-7) -- polymer-bonded explosives (PBXs) -- hollow microspheres -- water slurry method -- spray-drying method; Explosives -- Periodicals; Propellants -- Periodicals; 662.2
• DOI: 10.1080/07370652.2021.1886200
• Languages: English
• ISSNs: 0737-0652

Abstract

ABSTRACT: In this work, FOX-7 (1, 1-diamino-2, 2-dinitroethylene)-based polymeric microspheres were successfully prepared by the spray-drying method, in which recrystallized FOX-7 grains were integrated with Viton (dipolymers of hexafluoropropylene and vinylidene fluoride). FOX-7/Viton granules were prepared by water slurry method for comparison. FOX-7/Viton microspheres possessed a hollow structure with a typical shell thickness of 870 nm. The particle size of FOX-7/Viton grains on the shell of microspheres was significantly reduced from 33.31 μm (raw FOX-7) to 750 nm. Compared with raw FOX-7 and FOX-7/Viton granules prepared by the water slurry method, FOX-7/Viton hollow microspheres possessed a lower value of apparent activation energy in the thermal decomposition process and a higher characteristic height ( H50 ), which indicates increased thermal decomposition rate and better safety performance. VST test showed that three samples had acceptable thermal stability.