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Preparation, characterization of RDX/GAP nanocomposites, and study on the thermal decomposition behavior

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journal contribution
posted on 2018-10-30, 18:57 authored by Teng Chen, Bingwang Gou, GaZi Hao, Han Gao, Lei Xiao, Xiang Ke, Shuangfeng Guo, Wei Jiang

1, 3, 5-trinitro-1, 3, 5-triazinane/Glycidylazide polymer (RDX/GAP) energetic nanocomposites were fabricated via a facile sol-gel method. Morphologies and structure characterization of RDX/GAP energetic nanocomposites were studied by scanning electron microscopy (SEM), Raman and Fourier-transform infrared spectroscopy (FT-IR). SEM images indicated the sizes of RDX particles in RDX/GAP nanocomposites were in nanoscale. FT-IR spectra of RDX/GAP nanocomposites showed the conjunct characteristics of RDX and GAP, implying RDX particles were trapped in GAP gel matrix. Raman detection revealed the crystal form of RDX maintained original α-form during sol-gel process. The thermal kinetics and thermodynamics of RDX/GAP energetic nanocomposites were investigated by differential thermal analyzer (DTA) under various heating rates (5, 10, 15, and 20°C min−1). The kinetic and thermodynamic parameters of the energetic nanocomposites, such as activation energy (Ea), activation enthalpy (ΔH), activation entropy (ΔS), and activation Gibbs free energy of (ΔG) were obtained. The activation energies of RDX/GAP nanocomposites were lower than those of raw RDX and GAP-RDX mechanical mixtures, indicating RDX/GAP nanocomposites presented high thermolysis activities. The thermodynamic parameters presented a rising trend when the contents of RDX increase. The critical temperature of thermal explosion (Tb) and the self-accelerating decomposition temperature (TSADT) based on the activation energy were also obtained.

Funding

This work was financially supported by the Fundamental Research Funds for the Central Universities (No. 30916011315), the Qing Lan Project, the Weapon Research Support Fund (No. 62201070827), a Project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions, the Shanghai Aerospace Science and Technology Innovation Fund (SAST2015020) and Basic Product Innovation Technology Research Project of Explosives.

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