Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (2): 20230398.doi: 10.7503/cjcu20230398
• Physical Chemistry • Previous Articles Next Articles
CAO Huawen, TANG Qiufan, QU Bei, HUO Huan, ZHENG Qilong, CAO Yilin, LI Jizhen()
Received:
2023-09-05
Online:
2024-02-10
Published:
2023-12-07
Contact:
LI Jizhen
E-mail:jizhenli@126.com
Supported by:
CLC Number:
TrendMD:
CAO Huawen, TANG Qiufan, QU Bei, HUO Huan, ZHENG Qilong, CAO Yilin, LI Jizhen. Multi-stage Thermal Decomposition Mechanism of Energetic Plasticizer DNTN Triggered by Cleavage of the Nitrate Ester Bond[J]. Chem. J. Chinese Universities, 2024, 45(2): 20230398.
DNTN structure | Potential energy fluctuation(%) | Density fluctuation(%) | Density difference ratio(%) |
---|---|---|---|
Crystal | 0.010 | 0.22 | 2.65 |
Amorphous | 0.005 | 0.23 | 4.75 |
Table 1 Potential energy and density changes in the relaxation process of 75—100 ps and 100—125 ps, and the difference ratio between the optimized density and the true density
DNTN structure | Potential energy fluctuation(%) | Density fluctuation(%) | Density difference ratio(%) |
---|---|---|---|
Crystal | 0.010 | 0.22 | 2.65 |
Amorphous | 0.005 | 0.23 | 4.75 |
System | k/ps-1 | R2 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1400 K | 1500 K | 1700 K | 1800 K | 1900 K | 2000 K | 1400 K | 1500 K | 1700 K | 1800 K | 1900 K | 2000 K | ||
DNTN crystal structure | 0.032 | 0.061 | 0.173 | 0.208 | 0.240 | 0.274 | 0.961 | 0.978 | 0.979 | 0.962 | 0.938 | 0.906 | |
DNTN amorphous structure | 0.030 | 0.070 | 0.201 | 0.219 | 0.257 | 0.277 | 0.950 | 0.979 | 0.966 | 0.963 | 0.924 | 0.912 |
Table 2 First order kinetic equation of DNTN molecular decomposition in isothermal decomposition simulations(fitting curve parameters reaction rate k and coefficient of determination R2)
System | k/ps-1 | R2 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1400 K | 1500 K | 1700 K | 1800 K | 1900 K | 2000 K | 1400 K | 1500 K | 1700 K | 1800 K | 1900 K | 2000 K | ||
DNTN crystal structure | 0.032 | 0.061 | 0.173 | 0.208 | 0.240 | 0.274 | 0.961 | 0.978 | 0.979 | 0.962 | 0.938 | 0.906 | |
DNTN amorphous structure | 0.030 | 0.070 | 0.201 | 0.219 | 0.257 | 0.277 | 0.950 | 0.979 | 0.966 | 0.963 | 0.924 | 0.912 |
System | Fitted equation | E/(kJ·mol-1) | R2 |
---|---|---|---|
DNTN crystal structure | lnk=-10219.62(1/T)+4.00 | 84.97 | 0.96 |
DNTN amorphous structure | lnk=-10428.50(1/T)+4.18 | 86.70 | 0.93 |
Table 3 Fitted linear Arrhenius curves and activation energy for the decomposition of DNTN crystal and amorphous structures
System | Fitted equation | E/(kJ·mol-1) | R2 |
---|---|---|---|
DNTN crystal structure | lnk=-10219.62(1/T)+4.00 | 84.97 | 0.96 |
DNTN amorphous structure | lnk=-10428.50(1/T)+4.18 | 86.70 | 0.93 |
System | Temperature/K | Frequency | |||
---|---|---|---|---|---|
Decomposition by dimer form | Catalytic decomposition | Direct decomposition | Isomerization | ||
DNTN crystal structure | 1400 | 0.28 | 0.16 | 0.73 | 0.55 |
1700 | 0.16 | 0.08 | 0.65 | 0.13 | |
2000 | 0.09 | 0.02 | 0.69 | 0.02 | |
DNTN amorphous structure | 1400 | 0.27 | 0.20 | 0.26 | 0.62 |
1700 | 0.14 | 0.09 | 0.66 | 0.12 | |
2000 | 0.07 | 0.02 | 0.81 | 0.03 |
Table 4 Initial reaction path frequency statistics of DNTN at different temperatures
System | Temperature/K | Frequency | |||
---|---|---|---|---|---|
Decomposition by dimer form | Catalytic decomposition | Direct decomposition | Isomerization | ||
DNTN crystal structure | 1400 | 0.28 | 0.16 | 0.73 | 0.55 |
1700 | 0.16 | 0.08 | 0.65 | 0.13 | |
2000 | 0.09 | 0.02 | 0.69 | 0.02 | |
DNTN amorphous structure | 1400 | 0.27 | 0.20 | 0.26 | 0.62 |
1700 | 0.14 | 0.09 | 0.66 | 0.12 | |
2000 | 0.07 | 0.02 | 0.81 | 0.03 |
Product | Generation time/ps | Product | Generation time/ps |
---|---|---|---|
NO2 | 0.8 | H2O | 4.7 |
HCHO | 1.8 | CO2 | 6.4 |
NO3 | 2.4 | N2O | 13.6 |
NO | 3.6 | N2 | 15.5 |
Table 5 Formation time of small molecule products at 2000 K
Product | Generation time/ps | Product | Generation time/ps |
---|---|---|---|
NO2 | 0.8 | H2O | 4.7 |
HCHO | 1.8 | CO2 | 6.4 |
NO3 | 2.4 | N2O | 13.6 |
NO | 3.6 | N2 | 15.5 |
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