Accession Number : AD1023448


Title :   Investigation and Characterization of Water-Recrystallized Croconic Acid


Descriptive Note : Technical Report,01 Jan 2016,31 Oct 2016


Corporate Author : US Army Research Laboratory Aberdeen Proving Ground United States


Personal Author(s) : Isert ,Sarah ; Ciezak-Jenkins,Jennifer A


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=AD1023448


Report Date : 01 Dec 2016


Pagination or Media Count : 28


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.


Descriptors :   ACIDS , high pressure , RECRYSTALLIZATION , water , PHASE TRANSFORMATIONS , Thermal analysis , calorimetry , Xray diffraction , Raman spectroscopy , HEAT OF COMBUSTION , HEAT OF FORMATION , PROPELLANTS , temperature , oxygen


Subject Categories : Physical Chemistry
      Crystallography
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE