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Moisture desorption rates from TATB formulations: experiments and kinetic models
Elizabeth A Glascoe1, Long N Dinh, Ward Small
1Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA. glascoe2@llnl.gov
Water desorption from 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) occurs in two stages. Lower temperatures involve binder melting, while higher temperatures show TATB sublimation releasing significant moisture.
Area of Science:
- Materials Science
- Chemical Engineering
- Physical Chemistry
Background:
- PBX-9502 is a plastic-bonded explosive formulation.
- Understanding moisture desorption is critical for material stability and safety.
Purpose of the Study:
- To quantify the rate of water desorption from PBX-9502.
- To elucidate the mechanisms governing moisture release at different temperatures.
Main Methods:
- Temperature-programmed desorption (TPD) was employed.
- Kinetic modeling was used to analyze desorption data.
Main Results:
- Two distinct stages of water release were observed.
- Low-temperature release is linked to TATB thermal expansion and Kel-F binder melting.
- High-temperature release is attributed to TATB sublimation, exposing new surfaces.
Conclusions:
- The desorption process is temperature-dependent and involves multiple physical phenomena.
- Sublimation of TATB plays a significant role in high-temperature moisture release.
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