A ladder‐like 1D energetic metal‐organic framework, sodium 6‐nitro‐5‐oxidopyrazolo3,4‐c1,2,5oxadiazol‐4‐ide was first synthesized from the potassium salt. The sodium salt with an interesting ...furazan‐pyrazole system which is first synthesized by an intramolecular condensation, is fully characterized by crystal X‐ray diffraction, elemental analysis, IR spectroscopy. The sodium salt shows a density of 1.88 g cm−3, a high decomposition temperature of 258 oC, and a promising calculated detonation velocity of 7760 m s−1. It has an impact sensitivity of 16 J which makes it a replacement as a thermally stable energetic material. Besides, the natural compound 6‐nitro‐4H‐pyrazolo3,4‐c1,2,5oxadiazole 5‐oxide shows the best energetic properties with calculated detonation velocity of 9407 m s−1 and calculated detonation pressure of 40.4 GPa.
A ladder–like 1D energetic metal–organic framework: sodium 6‐nitro‐5‐oxidopyrazolo3,4‐c1,2,5oxadiazol −4‐ide was first synthesizedand characterized by single‐crystal X‐ray diffraction. Owing to the 1D metal‐organic framework, it showsgood thermal stability and relative low sensitivities. Furthermore, it exhibits acceptable detonation properities which make ita promising potential candidate of new thermally stable energetic materials.Introduction
A series of
cyclo
-N
5
−
-based lead-containing energetic coordination polymers Pb(OH)
4
(N
5
)
4
(
1
), Pb
3
(N
5
)
3
(H
2
O)
9
(NO
3
)
4
(N
5
)
8
(H
2
O)
5
(
2
), Pb(OH)
4
(N
5
)
3
(NO
3
)(H
2
O)
3
...(
3
), and Pb(OH)
4
(N
5
)
3
(ClO
4
)(H
2
O) (
4
) were synthesized by self-assembly and characterized by single-crystal X-ray diffraction, powder X-ray diffraction, infrared and Raman spectroscopy, high resolution mass spectrometry, elemental analysis, scanning electron microscopy, and differential scanning calorimetry. In addition, their thermal decomposition kinetics have been studied theoretically and experimentally. The results revealed that the synthesized CPs possess regular structures, very high densities (2.852-4.537 g cm
−3
), good oxygen balances (CO
2
) (−2.72-+2.61%), good thermal stabilities (80-110 °C), and acceptable sensitivities (9.5-20 J; 120-240 N). This work will provide new inspiration for the development of
cyclo
-N
5
−
-based coordination polymers and energetic materials.
A series of
cyclo
-N
5
−
-based energetic coordination polymers Pb(OH)
4
(N
5
)
4
, Pb(OH)
4
(N
5
)
3
(NO
3
)(H
2
O)
3
, and Pb(OH)
4
(N
5
)
3
(ClO
4
)(H
2
O) were self-assembled by
in situ
generated Pb
4
(OH)
4
4+
cubic cations trapping
cyclo
-N
5
−
.
A new family of energetic salts based on a new guanidinium cation containing furoxanyl functionality, 1-(3′-methylfuroxanyl)methyleneamino guanidinium cation, were synthesized and well characterized ...by IR and multinuclear NMR spectroscopy, elemental analysis as well as differential scanning calorimetry. The structures of salts
1
,
4
,
5
and
6
were confirmed by single-crystal X-ray diffraction. Most of the salts decompose at temperatures over 180 °C. Furthermore, except for salts
7
and
9
, the remaining energetic salts exhibit low impact sensitivities (15-40 J), friction sensitivities (120-360 N), and are insensitive to electrostatics. The detonation pressure values calculated for these salts range from 19.3 to 27.5 GPa, and the detonation velocities range from 7515 to 8402 m s
−1
. These results make some energetic salts potential candidates for energetic materials with good thermal stabilities and low sensitivities.
A new family of energetic salts based on a guanidinium cation containing furoxanyl functionality was synthesized and well characterized.
New energetic picryl derivatives were synthesized
via
the reactions of 2,4,6-trinitrobenzaldehyde with high nitrogen content compounds (above 70%) containing the hydrazine group. The resulting ...compounds
1-3
and
5-7
were characterized well by IR spectroscopy, multinuclear NMR spectroscopy, DSC measurements as well as elemental analysis. Additionally, the structures of compounds
1
,
2
and
5
were confirmed by single crystal X-ray diffraction analysis. Except for compound
2
, all the remaining products exhibit good thermal stabilities with decomposition onset temperatures above 180 °C. All products possess high heats of formation ranging from 128.62 to 989.52 kJ mol
−1
. The calculated detonation velocities lie in the range between 7417 and 8271 m s
−1
. The detonation pressures range between 21.8 and 31.1 GPa.
The synthesis of new picryl derivatives containing a high nitrogen content moiety from new starting materials are reported.
The high voltage capacity is enlarged constantly, which needs good anticorona materials and suitable anticorona structure. When researching and optimizing anticorona structure, it needs to have the ...knowledge of the development status of anticorona materials for high voltage generators. This paper covers the ways of optimization process of anticorona materials from the following aspects: the choice of raw materials, the performance of SiC powder, the influence of doped materials on anticorona performance. Once-solidification-molding anticorona and painting anticorona are respectively suitable for the resin-rich insulation system and the vacuum pressure impregnation (VPI) resin-less insulation system. The gas permeability of the prefabricated carrier tapes and the stability of the anticorona layer resistances are the important factors to influence on using the once-solidification-molding anticorona structure in VPI resin-less insulation system. The resistance dispersion of the anticorona layers and the SiC content are the important factors to influence on the anticorona effect. The anticorona structure and technology are introduced from the following aspects: additional insulation outside the anticorona layers, the covering lacquer, the influence factors of corona voltage, etc. The optimization calculations of the anticorona structures theoretically summarize the sphere of application for anticorona layer parameters.
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