To improve the safety of octahdro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), a submicron energetic material, 1,3,5-triamino-2,4,6-trinitrobenzene (TATB), was introduced to coat HMX by a novel method. This novel method contained the reaction crystallisation and the solvent–non-solvent method. X-ray diffraction, scanning electron microscope, and optical microscopy analyses showed that a homogeneous layer of TATB particles with submicron scale had been successfully coated on the surface of HMX particle. Differential scanning calorimetry and thermogravimetry indicated that the coated HMX only had an exothermic peak at 279.4 °C, and the phase transition temperature reached 213.5 °C and increased by 20.2 °C compared with the pure HMX. The content of the coating TATB was determined to be 6.2 wt.% through high-performance liquid chromatograph. Relative to the mechanically mixed HMX/TATB, the drop height (H ₅₀) was increased from 23.0 to 74.1 cm, and the friction probability was reduced from 4 to 0% for the coated HMX.

References

1. 1)
  - 11. Smith, K.-T., Johansen, H., Skjold, E., et al: ‘Pressable plastic-bound explosive composition’, US7857922, 2010.
2. 2)
  - 26. ‘Materials Studio 3.0’ (Accelrys, Inc., San Diego, CA, 2004).
3. 3)
  - 24. Nandi, A.K., Ghosh, M., Sutar, V.B., et al: ‘Surface coating of cyclotetramethylenetetranitramine (HMX) crystals with the insensitive high explosive 1, 3, 5-triamino-2, 4, 6-trinitrobenzene (TATB)’, Cent. Eur. J. Energ. Mater., 2012, 9, pp. 119–130.
4. 4)
  - 9. Nakajima, K.: ‘Thickness–composition diagrams of Stranski–Krastanov mode in the GaPSb/GaP and InGaAs/GaAs systems’, J. Cryst. Growth, 1999, 203, pp. 376–386 (doi: 10.1016/S0022-0248(99)00108-6).
5. 5)
  - 21. Fowkes, F.M., Mostafa, M.A.: ‘Acid–base interactions in polymer adsorption’, Ind. Eng. Chem. Res., 1978, 17, pp. 3–7 (doi: 10.1021/i360065a002).
6. 6)
  - 35. Han, T.Y.-J., Pagoria, P.F., Gash, A.E., et al: ‘The solubility and recrystallization of 1, 3, 5-triamino-2, 4, 6-trinitrobenzene in a 3-ethyl-1-methylimidazolium acetate–DMSO co-solvent system’, New J. Chem., 2009, 33, pp. 50–56 (doi: 10.1039/B810109D).
7. 7)
  - 19. Kou, L.: ‘Study on the insensitive action of TATB on HMX’, Chin. J. Explosives Propellants, 1999, 3, pp. 25–28.
8. 8)
  - 18. Voreck, W.E.Jr., Brooks, J.E., Eberhardt, J.R., et al: ‘Shaped charge for a perforating gun having a main body of explosive including TATB and a sensitive primer’, US5597974, 1997.
9. 9)
  - 33. An, C.W., Li, F.S., Song, X.L., et al: ‘Surface coating of RDX with a composite of TNT and an energetic – polymer and its safety investigation’, Propellants Explosives Pyrotechnics, 2009, 34, pp. 400–405 (doi: 10.1002/prep.200700286).
10. 10)
  - 14. An, C., Wang, J., Xu, W., et al: ‘Preparation and properties of HMX coated with a composite of TNT/energetic material’, Propellants Explosives Pyrotechnics, 2010, 35, pp. 365–372 (doi: 10.1002/prep.200900060).
11. 11)
  - 23. Hofmann, H., Rudolf, K.: ‘Process for the production of a pressed insensitive explosive mixture’, US20030005990, 2004.
12. 12)
  - 36. Tan, X.-R., Duan, X.-H., Pei, C.-H., et al: ‘Preparation of nano-TATB by semibatch reaction crystallization’, Nano, 2013, 8, (05), p. 1350055 (doi: 10.1142/S1793292013500550).
13. 13)
  - 10. Manning, T.G., Strauss, B.: ‘Reduction of energetic filler sensitivity in propellants through coating’, US6524706, 2003.
14. 14)
  - 20. Manson, J., Williams, J.: ‘Acid base interaction between siliceous fillers and polymeric matrices’, Abstr. Pap. Am. Chem. Soc., 1980, 179, p. 30.
15. 15)
  - 1. Øyvind, H.J., Jørn, D.K., Gjersøe, R., et al: ‘RDX and HMX with reduced sensitivity towards shock initiation – RS–RDX and RS–HMX’, Propellants Explosives Pyrotechnics, 2008, 33, pp. 20–24 (doi: 10.1002/prep.200800203).
16. 16)
  - 17. Sun, J., Huang, H., Zhang, Y., et al: ‘In-situ coating of TATB on HMX’, Energy Mater., 2006, 14, pp. 330–332.
17. 17)
  - 34. Nandi, A., Kasar, S., Thanigaivelan, U., et al: ‘Synthesis and characterization of ultrafine TATB’, Chin. J. Energ. Mater., 2007, 25, pp. 213–231 (doi: 10.1080/07370650701567066).
18. 18)
  - 16. Kim, K.J., Kim, H.S.: ‘Agglomeration of NTO on the surface of HMX particles in water – NMP solvent’, Cryst. Res. Technol., 2008, 43, pp. 87–92 (doi: 10.1002/crat.200710946).
19. 19)
  - 32. Field, J.E.: ‘Hot spot ignition mechanisms for explosives’, Acc. Chem. Res., 1992, 25, pp. 489–496 (doi: 10.1021/ar00023a002).
20. 20)
  - 4. Van Der Heijden, A.E., Bouma, R.H.: ‘Crystallization and characterization of RDX, HMX, and CL-20’, Cryst. Growth Des., 2004, 4, pp. 999–1007 (doi: 10.1021/cg049965a).
21. 21)
  - 15. Kim, K.J., Kim, H.S.: ‘Coating of energetic materials using crystallization’, Chem. Eng. Technol., 2005, 28, pp. 946–951 (doi: 10.1002/ceat.200500078).
22. 22)
  - 3. Doherty, R.M., Watt, D.S.: ‘Relationship between RDX properties and sensitivity’, Propellants Explosives Pyrotechnics, 2008, 33, pp. 4–13 (doi: 10.1002/prep.200800201).
23. 23)
  - 8. Somoza, C., Blackwell, J.A.: ‘Process for reducing sensitivity in explosives’, US5279492, 1994.
24. 24)
  - 12. Simpson, R., Urtiew, P., Ornellas, D., et al: ‘CL – 20 performance exceeds that of HMX and its sensitivity is moderate’, Propellants Explosives Pyrotechnics, 1997, 22, pp. 249–255 (doi: 10.1002/prep.19970220502).
25. 25)
  - 25. Sun, H.: ‘COMPASS: an ab initio force-field optimized for condensed-phase applications overview with details on alkane and benzene compounds’, J. Phys. Chem. B, 1998, 102, pp. 7338–7364 (doi: 10.1021/jp980939v).
26. 26)
  - 31. Brill, T., Karpowicz, R.: ‘Analysis of intra- and intermolecular interactions relating to the thermophysical behavior of. alpha.-,. beta.-, and. delta.-octahydro-1, 3, 5, 7-tetranitro-1, 3, 5, 7-tetraazocine’, J. Phys. Chem., 1982, 86, pp. 4260–4265 (doi: 10.1021/j100218a033).
27. 27)
  - 28. Cady, H.H., Larson, A.C.: ‘The crystal structure of 1, 3, 5-triamino-2, 4, 6-trinitrobenzene’, Acta Crystallogr., 1965, 18, pp. 485–496 (doi: 10.1107/S0365110X6500107X).
28. 28)
  - 22. Shen, J.P., Duan, X.H., Luo, Q.P., et al: ‘Preparation and characterization of a novel cocrystal explosive’, Cryst. Growth Des., 2011, 11, pp. 1759–1765 (doi: 10.1021/cg1017032).
29. 29)
  - 2. Kröber, H., Teipel, U.: ‘Crystallization of insensitive HMX’, Propellants Explosives Pyrotechnics, 2008, 33, pp. 33–36 (doi: 10.1002/prep.200800205).
30. 30)
  - 27. Choi, C.S., Boutin, H.P.: ‘A study of the crystal structure of-cyclotetramethylene tetranitramine by neutron diffraction’, Acta Crystallogr. B, Struct. Crystallogr. Cryst. Chem., 1970, 26, pp. 1235–1240 (doi: 10.1107/S0567740870003941).
31. 31)
  - 6. Bower, J.K., Kolb, J.R., Pruneda, C.O.: ‘Pruneda, polymeric coatings effect on surface activity and mechanical behavior of high explosives’, Ind. Eng. Chem. Prod. Res. Dev., 1980, 19, pp. 326–329 (doi: 10.1021/i360075a010).
32. 32)
  - 7. Kincaid, J.F., Reed, R.Jr.: ‘Bonding agent for HMX (cyclotetramethylenetetranitramine)’, US4350542, 1982.
33. 33)
  - 5. Svension, L., Nyqvist, J.O., Westlin, L.: ‘Crystallization of HMX from g-butyrolactone’, L. J. Hazardous Mater., 1986, 13, pp. 103–112 (doi: 10.1016/0304-3894(86)80011-5).
34. 34)
  - 30. Brill, T., Reese, C.: ‘Analysis of intramolecular and intermolecular interactions relating to the thermo-physical behavior of alpha, beta and delta octahydro-1,3,5,7-tetranitro-1,3,5,7-tetraazocine’, J. Phys. Chem., 1980, 84, pp. 1376–1380 (doi: 10.1021/j100448a018).
35. 35)
  - 13. Cowey, K., Day, S., Fryer, R.: ‘Examination of wax – coated RDX by scanning electron microscopy and X-ray photoelectron spectroscopy’, Propellants Explosives Pyrotechnics, 1985, 10, pp. 61–64 (doi: 10.1002/prep.19850100302).
36. 36)
  - 29. Saw, C.K., Zaug, J.M., Farber, D.L., et al: ‘Using simultaneous time-resolved SHG and XRD diagnostics to examine phase transitions of HMX and TATB’. AIP Conf. Proc., 2002, vol. 620, pp. 856–859.

Method for surface coating of octahdro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine with submicron 1,3,5-triamino-2,4,6-trinitrobenzene

References

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