Determination of the enthalpies of phase change for some of energetic materials by using the DSC method under reduced pressure

Abstract

The phase-change enthalpies of some energetic materials are detd. directly, safely, and rapidly by the DSC method in vacuo; the values obsd. are close to the ref. values. The method is of interest in estg. the energy hazards of condensed-phase energetic materials. The obsd. values (kcal/mol) of the heats of vaporization (ΔHv) and of sublimation (ΔHs) are as follows (material, ΔHv, and ΔHs given): TNT, 19.3, 24.9; 2,4,6-trinitroaniline, 22.9, 29.8; DATB, 26.5, 35.1; TATB, -, 43.6; PETN, -, 36.4; Tetryl, 25.9, 31.8; NH4NO3, 42.9, 44.4; picric acid, 21.0, 25.4; 2,4,6-trinitro-m-xylene, 21.0, 29.3; 2,4,6-trinitrochlorobenzene, 20.4, 24.8; styphnic acid, 22.2, 28.7; 2-nitrophenylhydrazine, 23.8, 29.8. [on SciFinder(R)]