Characterization of Polymer‐Coated RDX and HMX Particles

Abstract

Fourier transform‐infrared spectroscopy (FT‐IR) in transmission and photoacoustic detection (PAS) techniques have been used for the characterization of polymeric coating of cyclotrimethylenetrinitramine (RDX) using a fluoroelastomer (Viton®). Although the bands of the polymer were indicated by two different techniques, the transmission (casting film) showed better evidence of absorption of fluoroelastomer for the polymer coating of the energetic material. Also attenuated total reflectance (ATR), another FT‐IR technique, has been used to analyze a cyclotetramethylenetetramine (HMX)/Viton system for the characterization of Viton bands and it showed excellent results without sample preparation.

Stabilization of ammonium azide particles through its microencapsulation with some organic coating agents

“…In alignment with previous reports [13][14][15][16][17][18][19][20], some coating agents such as paraffin, wax, nitrocellulose, oleic acid, stearic acid, Viton, melamine, polystyrene and cellulose acetate may be used as a coating agent in our microencapsulation procedure. However, among them, nitrocellulose, stearic acid and Viton have been chosen due to their relatively high combustion and gas generation abilities and good solubility in conventional solvents which are desired for related applications [20][21][22]. The effect of the coating agent on the maximum temperature and heat of sublimation of pure and coated ammonium azide is summarized in Table 1.…”

“…This technique can be used to limit the reaction of two active species due to physical separation. In recent decades, microencapsulation techniques were widely used in diverse fields of sciences and technologies such as polymerizations, drug delivery, particulate design, micro and nanoparticles production [8][9][10][11][12], however, few attempts have been made for the modification of the surface morphology and thermal stability of inorganic reactive powders, for instance, coating of the NH 4 NO 3 particles by vapor deposition polymerization technique [13], coating of the NH 4 ClO 4 by solvent/non-solvent method [14], Powder Technology 208 (2011) 137-143 improvement of humidity resistance of Mg powder by using magnetically assisted impact coating (MAIC) [15] and rapid expansion of supercritical fluid [16], passivation of the surface of Al nano powders [17,18], formation of organic coating on Ag nano powders using an aerosol technique [19] and our recent study on the coating of NaN 3 particles with nitrocellulose by solvent/non-solvent method [20].Also, the use of particle coating techniques in pyrotechnics and explosives is a field of study which appears to be gaining importance [21][22][23][24].…”

“…Also these organic additives may function as lubricant, plasticizer and dispersants [17,[21][22][23][24][25].…”

“…Fluoroelastomers, such as Viton, have outstanding chemical stability and are being widely used in coating of energetic material [22].…”

Preparation and characterization of insensitive HMX/rGO/G composites via in situ reduction of graphene oxide

“…Furthermore, researches have focused on the addition of common insensitive materials, including wax, stearic acid, polymers [11][12][13] and carbon materials to high-energy explosives. Other studies have focused on the desensitization of highenergy explosive material via coating techniques, such as water slurry coating, crystallization coating, spray-drying coating, and in situ polymerization coating.…”