Crystallization Behavior of Hexanitrohexaazaisowurtzitane at 298K and Quantitative Analysis of Mixtures of Its Polymorphs by FTIR.

Abstract

The crystallization behavior of hexanitrohexaazaisowurtzitane (HNIW) has been investigated at 298 K. Only the β form crystallized at the initial stage of crystallization, and it converted to the ε form with a solution-mediated transformation mechanism. Through the measurement of the solubilities of each polymorph (β and ε) at 298 K, it was confirmed that the ε form is stable and the β form is metastable. In addition, an analytical method has been developed for the determination of the fraction of the ε form in the precipitates using a FTIR spectrometer.