Synthesis, Thermal Decomposition Mechanism and Kinetic Equation of Polyhedral Boron Hydride Compound [(C2H5)4N]2B10H10 with High Enthalpy of Combustion†

doi:10.7503/cjcu20140473

Abstract

Abstract:

As a promising burning rate modifier of propellents, the boron hydride salt [(C₂H₅)₄N]₂B₁₀H₁₀was synthesized by the pyrolysis of tetraethylammonium borohydride and characterized by IR, ¹H NMR, ¹¹B NMR and elementary analysis. The thermal stabilities in Ar or in O₂ were investigated by DSC and TG. The results showed that it decomposed with less heat release in Ar. But in O₂, it decomposed at first then was oxided with more heat release. The kinetic equation of thermal decomposition reaction was obtained by Kissinger method and Coat-Redfern program. Using combined solid reaction cell in-situ and FTIR, DSC-TG-FTRI-MS simultaneous techniques, thermal decomposition mechanism was supposed, the compound decomposes at 303.2 ℃, and produces C₂H₆, NH₃, H₂ and B.

Key words: (C2H5)4N]2B10H10, Thermal decomposition mechanism, Kinetic equation, Thermal stability

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TrendMD:

XUE Yunna, LI Jiaoyi, HAO Zhijun, WAN Hong, ZHAO Haixia, Li Chunying, DU Yongmei, Lu Juyou, Yu Qinwei, Lü Jian. Synthesis, Thermal Decomposition Mechanism and Kinetic Equation of Polyhedral Boron Hydride Compound [(C₂H₅)₄N]₂B₁₀H₁₀ with High Enthalpy of Combustion^†[J]. Chem. J. Chinese Universities, 2015, 36(2): 375.

Figures/Tables 6

Fig.1 Chemical structure of [(C2H5)4N]2B10H10

Fig.2 DSC(a) and TG(b) curves of [(C2H5)4N]2B10H10 in Ar

Fig.3 DSC(a) and TG(b) curves of [(C2H5)4N]2B10H10 in O2

Fig.4 IR characteristic transmittance of condensed phase of [(C2H5)4N]2B10H10 thermal decomposition vs. temperature a. 1182 cm-1; b. 2992 cm-1; c. 1459 cm-1; d. 2452 cm-1.

Fig.5 MS ion flow intensity of gas products of [(C2H5)4N]2B10H10 thermal decomposition vs. temperature

Scheme 1 Thermal decomposition mechanism of [(C2H5)4N]2B10H10

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Synthesis, Thermal Decomposition Mechanism and Kinetic Equation of Polyhedral Boron Hydride Compound [(C₂H₅)₄N]₂B₁₀H₁₀ with High Enthalpy of Combustion^†

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