Abstract
2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (CL-20) is a widely used high-energy explosive for the application of energetic materials. However, the phase transformation from ε-CL-20 to γ-CL-20 restrains its further application in polymer bonded explosives (PBXs) and propellants. To inhibit the phase transition of CL-20, dopamine was first used in an efficient and facile method of in situ polymerization to passivate CL-20 crystals. The core-shell microcapsule particles were obtained, and the morphological characterization demonstrates the formation of a dense core-shell structure. The differential scanning calorimetry (DSC) and in situ X-ray diffraction (XRD) test results show that the compact and dense coating delays the ε-CL-20 crystal transformation temperature by about 30 °C, which enhances thermal stability. In addition, with the coating via polymers, the friction sensitivity of ε-CL-20 crystals decreases significantly. The findings indicate a successful application of dopamine chemistry in high-energy explosives, which provides an attractive method to modify the properties of CL-20 crystals.
Highlights
Featured Application: We aimed to obtain a dense ε-CL-20/polydopamine core-shell structure by chemical bionic technology that can effectively inhibit the solid–solid phase transition existing for CL-20 crystals and greatly enhance the thermal safety
For the raw ε-CL-20 particles prepared via a recrystallization process, the crystal morphologies of raw ε-CL-20 content epsilon‐CL‐20 (ε‐CL‐20) and four core‐shell structures
With the temperature increasing to 190 ◦ C, we found that almost all ε-CL-20 of ε-CL-20, ε-CL-20/PLD, and ε-CL-20/PNE converted to γ-CL-20
Summary
Featured Application: We aimed to obtain a dense ε-CL-20/polydopamine core-shell structure by chemical bionic technology that can effectively inhibit the solid–solid phase transition existing for CL-20 crystals and greatly enhance the thermal safety. Obtained well-coated CL-20 particles could be employed in high-energy insensitive polymer bonded explosives (PBX), promoting the development of weapons and equipment. 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane (CL-20) is a widely used high-energy explosive for the application of energetic materials. The phase transformation from ε-CL-20 to γ-CL-20 restrains its further application in polymer bonded explosives (PBXs) and propellants. The findings indicate a successful application of dopamine chemistry in high-energy explosives, which provides an attractive method to modify the properties of CL-20 crystals. The internal defect structure of explosive crystals adversely influences the mechanical and thermal sensitivity of polymer bonded explosives (PBX) [7,8]. The phase transition of CL-20 must be investigated
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