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Detailed measurements of the bulk electrical dc conductivity of polycrystalline diamond sheets grown in a controlled way with extensive defect structure are discussed. It was found that the diamond sheets deposited at low deposition pressure contain very small nondiamond impurities.

Dinitro-diaza-alkanes (DNDA-57) are linear nitramine plasticizers and find use in low-temperature sensitivity coefficient propellants. DNDA-57 is a mixture of 2,4-dinitro-2,4-diazapentane (DNDA-5), 2,4-dinitro-2,4-diazahexane (DNDA-6), and 3,5-dinitro-3,5-diazaheptane (DNDA-7) with percentage composition of 40 ± 5%, 44 ± 5% and 11 ± 2%, respectively. The synthesis process of DNDA-57 was established with slight modification of the reaction parameters to obtain good yield and the process was scaled up. The synthesized compound was thoroughly characterized by spectroscopic as well as thermal methods. The present study emphasizes gas chromatographic–mass spectrometric (GC/MS) characterization by electron impact (EI) mode and chemical ionization (CI) mode to determine the fragmentation pattern. Further, the identified components were confirmed with general characterization. The study reveals that DNDA-5, DNDA-6, and DNDA-7 follow identical decomposition pattern. The friction and impact sensitivity study unveils the insensitive nature of DNDA-57. [ABSTRACT FROM AUTHOR]

An energetic plasticizer, 1,3-diazido-2-ethyl-2-nitropropane (DAENP), was synthesized and characterized in good yield and high purity. DAENP is synthesized in three steps: 1) 1-nitropropane is condensed with formaldehyde to yield 2-ethyl-2-nitro-1,3-propane diol; 2) 2-ethyl-2-nitro-1,3-propane diol on tosylation gave 2-ethyl-2-nitro-1,3-bis(p-toluene sulfonyl) propyl ester; 3) azidation of the tosylated compound gives DAENP. The product was characterized by elemental analysis, Fourier transform infrared (FTIR) spectroscopy and 1H-NMR and purity was tested by high-performance liquid chromatography (HPLC). Thermal studies revealed that DAENP is thermally stable up to 196°C, has high energy output of the order 2,056 J/g, and a very low glass transition temperature (−96.76°C). DAENP is compatible with energetic binders like glycidyl azide polymer (GAP), 3,3-bis (azido methyl)oxetane–tetra hydroxyl furan (BAMO-THF) copolymer, and poly-3-nitrato methyl-3-methyl oxtetane (poly NIMMO or PLN). Rheological and thermal data showed that it can be used successfully with these binders. [ABSTRACT FROM AUTHOR]

Different amino- and methyl-trinitrodiazoles have been considered as potential candidates for high explosives by quantum chemical treatment. Geometric and electronic structures, band gap, thermodynamic properties, crystal density, and detonation properties have been studied using density functional theory (DFT) at the B3LYP/aug-cc-pVDZ level. Presumably the relative positions of methyl or amino group and nitro groups in the trinitrodiazole determines the stability, sensitivity, and crystal density and thus detonation performance. The chemical energy of explosion (1.35 to 1.47 kcal/g), density (1.93 g/cm3), detonation velocity (9.0 to 9.30 km/s), and detonation pressure (38 to 40.10 GPa) of aminotrinitrodiazoles are comparable to 1,3,5-trinitro-1,3,5-triazinane (RDX) and 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX). [ABSTRACT FROM AUTHOR]

Potassium, rubidium, and cesium salts of 5,7-diamino- 4,6-dinitrobenzofuroxan (CL-14) have been prepared by reacting sodium salt of 5,7-diamino-4,6-dinitrobenzofuroxan with alkali metal nitrate in an aqueous medium. The structure of the compounds was unequivocally confirmed by spectra data, elemental analyses, and estimation of metal content. Further, the compounds have been evaluated for explosive and thermal properties and found more suitable as compared to alkali metal salts of 4,6-dinitrobenzofuroxan (DNBF). [ABSTRACT FROM AUTHOR]