Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 33, Pages 30341-30351Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b10506
Keywords
PDA; TATB; HMX; core@double-shell structure; sensitivity; mechanical properties; interfacial
Funding
- National Natural Science Foundation of China [51703211, 21875232, 21875229, 21875230, 11502243, 11502245, 11702266, 11702267]
- Presidential Foundation of CAEP [YZJJLX2016005]
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A novel core@double-shell (CDS) 1,3,5,7-tetranitro-1,3,5,7-tetrazocane (HMX) based energetic composite was constructed with an inner nano-1,3,5-triamino-2,4,6-trinitrobenzene (nano-TATB) shell and outer polydopamine (PDA) shell fabricated via a facile ultrasonic method and a simple immersion method, respectively. The inner nanoTATB shell was chosen to reduce the sensitivity of HMX while maintaining explosion performance; the outer PDA shell was adopted to enhance the interfacial interaction between explosive crystals and polymer binder. The uniform PDA coating resulted in the increased beta-delta phase transition temperature of HMX from 197.0 to 212.8 degrees C. Because of the perfect and compact nano-TATB coating on the surface of the HMX particles, the impact sensitivity was significantly decreased for the HMX@TATB@PDA particles (10 J), in comparison with the physical mixture with an equivalent composition (5 J). Polymer-bonded explosives (PBXs) based on CDS structured particles were designed and characterized in comparison with their core@single-shell (CSS) counterparts or physical mixtures. Due to the strong chemical and physical interfacial interaction, PBXs based on CDS structured particles displayed improved mechanical strength and roughness, storage modulus, as well as creep resistance.
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