Thermal behaviors, nonisothermal decomposition reaction kinetics, thermal safety and burning rates of BTATz-CMDB propellant.
The composite modified double base (CMDB) propellants (nos. RB0601 and RB0602) containing 3,6-bis (1H-1,2,3,4-tetrazol-5-yl-amino)-1,2,4,5-tetrazine (BTATz) without and with the ballistic modifier were prepared and their thermal behaviors, nonisothermal decomposition reaction kinetics, thermal safety and burning rates were investigated. The results show that there are three mass-loss stages in TG curve and two exothermic peaks in DSC curve for the BTATz-CMDB propellant. The first two mass-loss stages occur in succession and the temperature ranges are near apart, and the decomposition peaks of the two stages overlap each other, inducing only one visible exothermic peak appear in DSC curve during 350-550 K. The reaction mechanisms of the main exothermal decomposition processes of RB0601 and RB0602 are all classified as chemical reaction, the mechanism functions are f(alpha)=(1-alpha)(2), and the kinetic equations are dalpha/dt = 10(19.24)(1-alpha)(2)e(-2.32x10(4)/T) and dalpha/dt = 10(20.32)(1-alpha)(2)e(-2.32x10(4)/T). The thermal safety evaluation on the BTATz-CMDB propellants was obtained. With the substitution of 26% RDX by BTATz and with the help of the ballistic modifier in the CMDB propellant formulation, the burning rate can be improved by 89.0% at 8 MPa and 47.1% at 22 MPa, the pressure exponent can be reduced to 0.353 at 14-20 MPa.
Yi
Jian-Hua
JH
Xi'an Modern Chemistry Research Institute, Xi'an, PR China.
Zhao
Feng-Qi
FQ
Wang
Bo-Zhou
BZ
Liu
Qian
Q
Zhou
Cheng
C
Hu
Rong-Zu
RZ
Ren
Ying-Hui
YH
Xu
Si-Yu
SY
Xu
Kang-Zhen
KZ
Ren
Xiao-Ning
XN
D053834:Explosive Agents / Q000737:chemistry*; D007700:Kinetics; D012449:Safety; D013696:Temperature; D013777:Tetrazoles / Q000737:chemistry*; D013816:Thermodynamics
C543980:3,6-bis(1H-1,2,3,4-tetrazol-5-ylamino)-1,2,4,5-tetrazine; D053834:Explosive Agents; D013777:Tetrazoles