Qing Pei

Nonisothermal Thermal Decomposition Reaction Kinetics of Double-base Propellant Catalyzed with Lanthanum Citrate

Abstract The decomposition reaction kinetics of the double-base (DB) rocket propellant composed of the mixed ester of triethyleneglycol dinitrate (TEGDN) and nitroglycerin (NG), and nitrocellulose (NC) with lanthanum citrate as a combustion catalyst was investigated by thermogravimetry and differential thermogravimetry (TG-DTG), and differential scanning calorimetry (DSC) under atmospheric pressure and flowing nitrogen gas conditions. The results showed that the thermal decomposition processes of DB propellant had two mass loss stages: volatilization and decomposition of the mixed ester in the first-stage and exothermic decomposition reaction in the second-stage. The exothermic decomposition reaction mechanism obeyed the third-order chemical reaction rule. The kinetic parameters of the reaction were: Ea=231.14 kJ·mol–1, A=1023.29 s–1. The kinetic equation can be expressed as: dα/dt=1022.99(1–α)3e–2.78×104/T. The critical temperatures of the thermal explosion of the DB propellant obtained from the onset temperature (Te) and the peak temperature (Tp) were: Tbe=463.62 K, Tbp=477.88 K. The entropy of activation (ΔS≠), enthalpy of activation (ΔH≠), and free energy of activation (ΔG≠) of the reaction were 219.75 J·mol–1·K–1, 239.23 kJ·mol–1, and 135.96 kJ·mol–1, respectively.

Thermochemical properties of hydrazinium dipicrylamine in N-methyl pyrrolidone and dimethyl sulfoxide

The enthalpies of dissolution for Hydrazinium Dipicrylamine (HDPA) in N-methyl pyrrolidone (NMP) and dimethyl sulfoxide (DMSO) were measured using a RD496-2000 Calvet microcalorimeter at 298.15xa0K. Empirical formulae for the calculation of the enthalpies of dissolution (ΔdissH) were obtained from the experimental data of the dissolution processes of HDPA in NMP and DMSO. The linear relationships between the rate (k) and the amount of substance (a) were found. The corresponding kinetic equations describing the two dissolution processes were

Synthesis and thermal behavior of 1,8-dihydroxy-4,5-dinitroanthraquinone manganese salt

{{text{d}alpha } mathord{left/ {vphantom {{text{d}alpha} {text{d}t}}} right. kern-0pt} {text{d}t}} = 10^{ - 2.71}left( {1 - alpha } right)^{1.23}

Thermal Behavior and Non-Isothermal Decomposition Reaction Kinetics of Composite Modified Double Base Propellant Containing CL-20

dα/dt=10−2.71(1−α)1.23 for the dissolution of HDPA in NMP, and

Dissolution properties of ammonium dipicrylamide in dimethyl sulfoxide and N-methyl pyrrolidone

{{text{d}alpha } mathord{left/ {vphantom {{text{d}alpha} {text{d}t}}} right. kern-0pt} {text{d}t}} = 10^{ - 2.58}left( {1 - alpha } right)^{0.81}

Gallic acid bismuth zirconium double metal salt, preparation method and application thereof

dα/dt=10−2.58(1−α)0.81 for the dissolution of HDPA in DMSO, respectively.