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Kinetics of Polymorphic Transitions in Energetic Compounds

Chukanov N. V., Zakharov V. V., Korsunskiy B. L., Chervonnyi A. D., Vozchikova S. A.

Central European Journal of Energetic Materials

2016

Vol. 13, no. 2

483--504

Available data on the kinetics of polymorphic transitions (PTs) in energetic compounds under isothermal conditions are summarized and discussed. It is shown that the general kinetic regularities of these processes (stepwise and continuous regimes) depend on their topotactic mode (frontal or quasi-homogeneous, respectively). In reverse PTs, a nucleation stage is not observed, which is explained by the presence of nuclei of the low-temperature polymorph in the preheated sample. The influence of mechanical effects on the kinetics of PTs in molecular crystals is discussed.

The outlook for the use of pseudopolymorphic solvates in energetic materials

Lempert D. B., Chukanov N. V.

Central European Journal of Energetic Materials

2014

Vol. 11, no. 2

285--294

An analysis of the ballistic characteristics of propellants based on energetic pseudopolymorphic solvates has been performed. It is shown that the ballistic efficiency of solid composite propellants containing γ-HMX or α-CL-20 can be improved considerably by means of the introduction of small molecules into the structural cavities present in the crystal structures of these polymorphs. This effect may appear when small molecules (e.g. water, hydrazine, ethanol) enter into the crystal structure of the main component with no changes in the lattice parameters of the latter.