Effect of Habit Modifiers on Morphology and Properties of Nano‐HNS Explosive in Prefilming Twin‐Fluid Nozzle‐Assisted Precipitation

Abstract

In order to investigate the effect of crystal habit modifiers (CHM) on morphology, purity, thermal properties, and short duration shock pulses sensitivity of HNS, nanocrystalline HNS was recrystallized from ultra-pure water by the prefilming twinfluid nozzle-assisted precipitation (PTFN-P) method with two different CHMs and without CHM. Sodium carboxymethyl cellulose (CMC-Na) and white dextrine (WD) were selected as CHMs. The particles were characterized using SEM, BET, HPLC, DSC, and electrically exploded metal-foil driven flyer plate. The morphology of HNS explosive without modifiers was demonstrated to be short plate-like. However, in the presence of CMC-Na and WD as modifiers, long plate-like and ellipsoid morphologies were observed, respectively. The nanocrystalline HNS prepared with CMC-Na was more receptive to high velocity flyer impact than samples produced under the other two conditions. Its sensitivity to short duration shock waves was elevated to twice the value of HNS obtained in the absence of modifiers. CMC-Na was found to be a better modifier.

Electrospinning Preparation of NC/GAP/Submicron-HNS Energetic Composite Fiber and its Properties

“…7−9 Submicron-HNS show a more wonderful performance than traditional HNS. 10,11 However, HNS submicron particles is prone to aggregation because of the high surface energy of submicron materials. 12−14 Thus, it is very much desired that submicron-HNS particles can load on the surface of a kind of carrier with a high performance, by which the dispersion of submicron-HNS particles are improved remarkably.…”

“…2,2′,4,4′,6,6′-Hexanitrostilbene (HNS) is one of the most excellent explosives owing to its superior thermostability, low sensitivity, high density, and high specific impulse. − HNS is usually used in pyrotechnics and plays an important role in the aerospace field. − Especially, the development of aerospace technology puts forward higher requirements on energetic materials. − Submicron-HNS show a more wonderful performance than traditional HNS. , However, HNS submicron particles is prone to aggregation because of the high surface energy of submicron materials. − Thus, it is very much desired that submicron-HNS particles can load on the surface of a kind of carrier with a high performance, by which the dispersion of submicron-HNS particles are improved remarkably.…”

Nano-HNS Particles: Mechanochemical Preparation and Properties Investigation

“…Kaur et al employed the ultrasonic treatment solvent/nonsolvent method to reduce the size of HNS and determined solvent contamination of HNS by NMR and GC-MS analysis [8]. Wang et al adopted prefilming twin-fluid nozzle assisted precipitation method to prepare nanocrystalline HNS, whose particle size ranges from 90 nm to 150 nm [9,10]. Much organic solvent, such as dimethylformamide (DMF) and N-methyl pyrrolidone (NMP), was needed in the recrystallized process due to the relatively low solubility (∼2 g per 100 ml DMF).…”

Mechanism investigation for remarkable decreases in sensitivities from micron to nano nitroamine

“…In the past decade, scholars paid much attention to researches about nanometer energetic materials. Nano explosives, such as nano hexahydro-1,3,5-trinitro-1,3,5triazine (RDX), [1][2][3][4][5] nano octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), [6][7][8][9][10][11] nano 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (HNIW), 12,13 nano 2,2', 4,4', 6,6'-hexanitro-stilbene (HNS), 14,15 nano 3-nitro-1,2,4-triazol-5-one (NTO), 16 nano 1,3,5-triamino-2,4,6-trinitrobenzene (TATB), 17 nano nitrocellulose (NC), 18 and so on, were fabricated and their performance was investigated. However, there is no one proclaimed that nano energetics was successfully used in any practical type of ammunition.…”