Understanding the Mechanisms Leading to Gas Permeation in Thermally Damaged PBX 9501

摘要

We present data that indicate that thermally damaged PBX 9501 is substantially more permeable than the pristine material and that this may have a significant effect on the pre-ignition slow cook-off process, as well as the post-ignition flame spread process. Experiments indicate that the mechanism responsible for the formation of interconnected matrix porosity is likely dominated by nitroplasticizer decomposition in the early stages of the permeability evolution followed by secondary, slower HMX decomposition.