Author: Kenneth Kinard MilesPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 0
Book Description
The Thermal Decomposition of RDX.
Author: Kenneth Kinard MilesPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 0
Book Description
The Thermal Decomposition of RDX at Temperatures Below the Melting Point. IV. Catalysis of the Decomposition by Formaldehyde
Author: J. J. BattenPublisher:
ISBN:
Category :
Languages : en
Pages : 5
Book Description
The kinetics of the decomposition of RDX have been investigated in the presence of formaldehyde over the temperature range 170-197C with the RDX sample spread. This indicated a marked increase in the positive-catalytic effect of the formaldehyde with decreasing reaction temperature; however, the kinetics were not altered by the added formaldehyde. The activation energy was about 44 kcal/mol. (Author).
The Thermal Decomposition of RDX at Temperatures Below the Melting Point. V. The Evolution of Occluded Volatile Matter Prior to the Decomposition, and the Influence of Past History of the Sample on the Rate of Decomposition
Author: J. J. BattenPublisher:
ISBN:
Category :
Languages : en
Pages : 15
Book Description
It was first demonstrated that the occluded solvents and gases which are often present in RDX are expelled prior to zero reaction time of thermal decomposition. Thus they do not seriously interfere with the use of pressure increase as a measure of the extent of thermal decomposition. The rate of thermal decomposition is sublimed RDX at 195C was then compared with the rate after the following treatments, preliminary grinding of the crystals, preparation of the crystals by different techniques, mixing RDX with various solid additives, Interruption of the reaction by cooling, and pre-irradiation with ultraviolet light. (Author).
Thermal Decomposition of RDX from Reactive Molecular Dynamics
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 11
Book Description
We use the recently developed reactive force field ReaxFF with molecular dynamics to study thermal induced chemistry in RDX [cyclic-[CH2N(NO2)]3] at various temperatures and densities. We find that the time evolution of the potential energy can be described reasonably well with a single exponential function from which we obtain an overall characteristic time of decomposition that increases with decreasing density and shows an Arrhenius temperature dependence. These characteristic timescales are in reasonable quantitative agreement with experimental measurements in a similar energetic material, HMX [cyclic-[CH2N(NO2)]4]. Our simulations show that the equilibrium population of CO and CO2 (as well as their time evolution! depend strongly of density: at low density almost all carbon atoms form CO molecules; as the density increases larger aggregates of carbon appear leading to a C deficient gas phase and the appearance of CO2 molecules. The equilibrium populations of N2 and H2O are more insensitive with respect to density and form in the early stages of the decomposition process with similar timescales.
The Thermal Decomposition of Rdx at Temperatures Below the Melting Point. I. Comments on the Mechanism
Author: J. J. BattenPublisher:
ISBN:
Category :
Languages : en
Pages : 11
Book Description
Two mechanisms have recently been proposed to explain the behaviour of the initial rate of decomposition of RDX with change in sample geometry. These are (1) that the decomposition proceeds by concurrent gas and liquid phase reactions, and (2) that gaseous decomposition products influence the rate of decomposition of undecomposed RDX in the condensed phase. It is concluded that mechanism (2) is the more probable when the reaction is carried out in the presence of nitrogen.
Chemical and Physical Processes that Control the Thermal Decomposition of RDX and HMX.
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 18
Book Description
The current understanding of the chemical and physical processes that control the thermal decomposition of RDX and HMX, based on experiments conducted with a simultaneous thermogravimetric modulated beam mass spectrometer (STMBMS), is presented. The rate-limiting reactions and physical processes that control the decomposition of RDX and HMX in both the solid and liquid phases, which have been elucidated from over five hundred STMBMS experiments on these materials, are summarized in a general reaction scheme. This general reaction scheme is discussed and illustrated with selected results from the authors experimental work.
Thermal Decomposition of RDX and RDX-borohydride Mixtures
Author: Michael A. SchroederReaction Processes that Control the Thermal Decomposition of Mixtures of TAGzT and RDX.
Author: The Thermal Decomposition of RDX at Temperatures Below the Melting Point. III. Towards the Elucidation of the Mechanism
Author: J. J. BattenPublisher:
ISBN:
Category :
Languages : en
Pages : 10
Book Description
The rate of thermal decomposition of RDX has been investigated in the presence of its decomposition products and free radical traps. From the measurements, it is concluded that formaldehyde and nitrogen dioxide, presumably 'encaged' in the sample, catalyse the decomposition of RDX positively and negatively respectively. The non-volatile residue also acts as a positive catalyst. The other products have little or no effect on the rate, and the free radical traps did not reduce the rate. (Author).
The Thermal Decomposition of Rdx at Temperatures Below the Melting Point. Ii. Activation Energy
Author: J. J. BattenPublisher:
ISBN:
Category :
Languages : en
Pages : 7
Book Description
The activation energy has been determined in the temperature range 170-198C. If the sample was spread the activation energy was independent of the definition of the kinetic parameter substituted in the Arrhenius equation and was 63 kcal/mole. In the case of the unspread samples the activation energies of the induction, acceleration, and maximum rates were 49, 43, and 62 kcal/mole respectively. The effect that sample geometry has on the activation energy is attributed to gaseous decomposition products influencing the reaction. (Author).