Citation: YAO Er-Gang, ZHAO Feng-Qi, GAO Hong-Xu, XU Si-Yu, HU Rong-Zu, HAO Hai-Xia, AN Ting, PEI Qing, XIAO Li-Bai. Thermal Behavior and Non-Isothermal Decomposition Reaction Kinetics of Aluminum Nanopowders Coated with an Oleic Acid/Hexogen Composite System[J]. Acta Physico-Chimica Sinica, ;2012, 28(04): 781-786. doi: 10.3866/PKU.WHXB201202151 shu

Thermal Behavior and Non-Isothermal Decomposition Reaction Kinetics of Aluminum Nanopowders Coated with an Oleic Acid/Hexogen Composite System

1.
Science and Technology on Combustion and Explosion Laboratory, Xi'an Modern Chemistry Research Institute, Xi'an 710065, P. R. China

Received Date: 22 November 2011
Available Online: 15 February 2012
Fund Project: 国家自然科学基金(21173163) (21173163)燃烧与爆炸技术重点实验室基金(9140C3503141006)资助项目 (9140C3503141006)

Aluminum nanopowders (nmAl) coated with oleic acid (OA) were obtained under nitrogen atmosphere, and their surface morphologies and structures were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy. The thermal decomposition reaction kinetics of composite systems, nmAl/hexogen (RDX) and (nmAl + OA)/RDX, were investigated using differential scanning calorimetry (DSC). Their kinetic parameters and kinetic equations were obtained. The results showed that most of the OA adsorbed on the aluminum nanopowder surface by physical adsorption. Only a small amount of OA reacted with the surface aluminum atoms and adhered to the surface via chemical bonds. Compared with the nmAl/RDX composite, the peak temperatures for the (nmAl+OA)/RDX composite at multiple heating rates were lower. The apparent activation energy (E_a) and pre-exponential factor (A) of the main decomposition reaction were 141.18 kJ·mol^-1 and 10^12.57 s^-1. The reaction mechanism fits a three-dimensional diffusion mechanism and obeys the Jander equation with n= 1/2. The kinetic equation can be expressed as: dα/dt=10^13.35(1-α)^2/3[1-(1-α)^1/3]^1/2e^-16981.0/T.
- Physical chemistry,
- Aluminum nanopowder,
- Oleic acid,
- Coating,
- Hexogen,
- Nonisothermal decomposition reaction kinetics
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