Abstract
In this study, few-layered tungsten disulfide (WS2) was prepared using a liquid phase exfoliation (LPE) method, and its thermal catalytic effects on an important kind of energetic salts, dihydroxylammonium-5,5′-bistetrazole-1,1′-diolate (TKX-50), were investigated. Few-layered WS2 nanosheets were obtained successfully from LPE process. And the effects of the catalytic activity of the bulk and few-layered WS2 on the thermal decomposition behavior of TKX-50 were studied by using synchronous thermal analysis (STA). Moreover, the thermal analysis data was analyzed furtherly by using the thermokinetic software AKTS. The results showed the WS2 materials had an intrinsic thermal catalysis performance for TKX-50 thermal decomposition. With the few-layered WS2 added, the initial decomposition temperature and activation energy (Ea) of TKX-50 had been decreased more efficiently. A possible thermal catalysis decomposition mechanism was proposed based on WS2. Two dimensional-layered semiconductor WS2 materials under thermal excitation can promote the primary decomposition of TKX-50 by enhancing the H-transfer progress.
Highlights
Dihydroxylammonium-5,5′-bistetrazole-1,1′-diolate (TKX50) [1, 2] is a synthetic high-energy-density material which has a high detonation velocity, high density, and low toxicity properties
Thermal gravity analysis (TGA) and differential scanning calorimetry (DSC) data were investigated by a simultaneous thermal analyzer (STA) 449F3 Jupiter (Germany, NETZSCH) at a temperature range of 40-400°C under condition of argon to analyze the WS2’s effects on the decomposition of TKX-50
The transmission electron microscopy (TEM) image of bulk and treated WS2 shown in Figures 3(a) and 3(b) indicated that the exfoliated WS2 had a lamellar structure with thin layers
Summary
Dihydroxylammonium-5,5′-bistetrazole-1,1′-diolate (TKX50) [1, 2] is a synthetic high-energy-density material which has a high detonation velocity, high density, and low toxicity properties. It is considered as one of the substitutes to conventional energetic materials (EM) [3,4,5,6,7], such as RDX and HMX. The applications of WS2 as a catalyzer in the energetic materials have not been reported It is of great importance and significance to study thermal decomposition performance of TKX-50 by using. The catalytic properties of raw and as-obtained WS2 for TKX-50 thermal decomposition were studied through STA. This work offers a new way to design and fabricate TKX50-based composite with high thermal decomposition performances
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