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and
Z = the pi-e-exponential factor in reciprocal seconds,
E = energy in kilocalories per mole.
THERMAL PROPERTIES
The chemmal Arrhenius data plot, In k as a function of l/T, was used to obtain Z
and E.
The fraction decomposed is determined by Simpson’s Rule integration using
closely spaced deflection measurements.
Table 2.04 DECOMPOSITION KINETICS
Heat of
Activation
Density Reaction, Q Z
Energy, E
Explosive State
- ~
(g/cm? (caVt3) (l/s) (kcal/mole)
BTF
DATB
DIPAM
HMX
HNS
NQ
PAT0
PETN
RDX
TATB
Tetryl
TNT
TPM
--
Liquid
Liquid
Liquid
Liquid
Vapor
Liquid
Liquid
Liquid
Liquid
Liquid
Vapor
Solid
Liquid
Liquid
Liquid
1.901
1.834
1.79
1.81
--_
1.65
1.74
1.70
1.74
1.72
--_
1.84
1.73
1.57
1.75
Pure Explosives
600 4.11 x 1Ol2 37.2
300 1.17 x lOI6 46.3
-_- 2.22 x lo8 29.2
500 5 x 1Ol8 52.7
-_- 1.51 x lozo 52.9
500 1.53 x lo9 30.3
500 2.84 X lo1 20.9
500 1.51 x 1O’O 32.2
300 6.3 X 1018 47.0
500 2.02 x 1018 47.1
-_- 3.14 x 1Ol9 34.1
600 3.18 X 1Ol9 59.9
___ 2.5 X lOi 38.4
300 2.51 X 10” 34.4
___ 1.05 x lOI6 48.5
2.5 Heats of Combustion and Formation. Combustion experiments were con-
ducted in a stationary oxygen-bomb calorimeter that had an automatically con-
trolled adiabatic jacket. The calorimeter was calibrated by burning standard ben-
zoic acid to determine its effective energy equivalent.
The standard heat of combustion of the explosive (in kilocalories per mole) was
calculated by use of
AH: := AE; + 0.593 [j - 4 +;) ,
where b, c, and d are subscripts in the chemical formula CaHbNcOd,
and
AH: = standard heat of combustion at 25”C,
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