Investigation and Characterization of Water-Recrystallized Croconic Acid
Abstract
A high-pressure phase of croconic acid is being investigated as a novel energetic material. When pressed at high pressures (>5.5 GPa), as-received croconic acid transforms into a beta-phase that is recoverable to ambient conditions. This phase has a higher density and heat of combustion than the as-received material. Rectangular crystals, which are darker than the original powder, can be observed in the recovered material and are thought to indicate formation of the beta-phase. When croconic acid is recrystallized from water at ambient conditions, similar appearing crystals are observed. We performed experiments to investigate the plausibility of recovering the beta-phase croconic acid from water recrystallization as an alternative to the high-pressure synthesis. Thermal analysis, bomb calorimetry, X-ray diffraction, and Raman spectroscopy were performed on water-recrystallized croconic acid to determine whether or not it is the beta-phase. We found that the water-recrystallized material is not the beta-phase and at present high pressures is still required for beta-phase formation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 2016
- Accession Number
- AD1023448
Entities
People
- Jennifer A Ciezak-Jenkins
- Sarah Isert
Organizations
- United States Army Research Laboratory