Attempted α- to β-Phase Conversion of Croconic Acid via Ball Milling

Report No. ARL-TN-0824
Authors: Steven W Dean; Rose A Pesce-Rodriguez; Jennifer A Ciezak-Jenkins
Date/Pages: May 2017; 16 pages
Abstract: High-energy ball milling was used in an attempt to induce a high-pressure phase change in croconic acid (CA), which is being investigated as a potential novel energetic material. High-speed video of the milling process was analyzed to determine the peak pressures and impact durations experienced by the CA powder during milling. Differential scanning calorimetry was used to determine what effect varying the ball-to-sample mass ratio and milling time had on the energy content of the milled material. Results indicate the pressure achievable with currently available milling equipment is not sufficient to induce the desired α- to β-Phase change, and extended milling times may degrade the material.
Distribution: Approved for public release
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Last Update / Reviewed: May 1, 2017