Chemistry Reference
In-Depth Information
Fig. 8.11
Thermogravimetric
curves for the decomposition
of AP at ω = 6
.
3(
1
), 5.8 (
2
),
3.6 (
3
), 2.9 (
4
), 2.1 (
5
), 1.5 (
6
)
deg min
−
1
1.0
0.8
0.6
0.4
0.2
, min
The data on
k
2
obtained by the DTA and TGA methods were compared with
literature data obtained by methods based on linear pyrolysis (Chap. 3) and the
weight decrease under isothermal conditions [9]. Jacobs and Russel-Jones used a
so-called “contracting sphere” equation
)
0
.
5
=
k
2
t
1
−
(1
−
η
(8.2)
to describe the second stage thermal decomposition kinetics (at 305-380
◦
C) on the
basis of data on the decrease in the sample weight [11]. It can be shown that the
only difference between Eq. (8.2) and the expression
)
0
.
5
˙
η
=
k
2
(1
−
η
(8.3)
used in our work is the constant factor 0.5 on the right hand side of (8.2). Taking
this factor into account, one can see that the data on
k
2
given in [11] are in good
agreement with those in our work (Fig. 8.17, plots 6 and 7).
