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Tuning the Energetic Performance of CL-20 by Surface Modification Using Tannic Acid and Energetic Coordination

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Hexanitrohexaazaisowurtzitane (CL-20) performance was improved using energetic coordination polymers. This resulted in reduced impact sensitivity and tunable laser initiation, offering a new path for designing advanced energetic materials.

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Area of Science:

  • Materials Science
  • Energetic Materials Chemistry
  • Nanotechnology

Background:

  • Hexanitrohexaazaisowurtzitane (CL-20) is a powerful energetic material but suffers from high sensitivity.
  • Energetic Coordination Polymers (ECPs) offer tunable properties for modulating energetic material performance.
  • Surface modification of CL-20 is a key strategy to enhance its safety and tailor its initiation characteristics.

Purpose of the Study:

  • To investigate the modulation of CL-20's energetic performance using two specific ECPs: [Cu(ANQ)2(NO3)2] and [Ni(CHZ)3](ClO4)2.
  • To develop a two-step surface modification method for CL-20.
  • To evaluate the impact sensitivity and laser-induced initiation properties of the modified CL-20.

Main Methods:

  • A two-step synthesis involving in-situ polymerization of tannic acid (TA) on CL-20 crystals.
  • Hydrothermal formation of [Cu(ANQ)2(NO3)2] and [Ni(CHZ)3](ClO4)2 on the CL-20/TA surface.
  • Explosion performance tests, including impact sensitivity measurements and laser initiation threshold determination.

Main Results:

  • The CL-20/TA/[Cu(ANQ)2(NO3)2] composite exhibited a 58% reduction in impact sensitivity without compromising energetic output.
  • The CL-20/TA/[Ni(CHZ)3](ClO4)2 composite demonstrated laser-sensitive initiation at 107.3 mJ, significantly lower than unmodified CL-20.
  • Unmodified CL-20 could not be initiated even at 4000 mJ laser energy.

Conclusions:

  • It is feasible to modify CL-20 performance by introducing ECPs with specific properties, such as high energy insensitivity or laser sensitivity.
  • This surface modification approach offers a promising route for designing next-generation high-energy, insensitive energetic materials.
  • The tailored properties of ECPs allow for precise control over the safety and initiation characteristics of CL-20.