Hybrid RDX crystals assembled under constraint of 2D materials with largely reduced sensitivity and improved energy density

Xue-Xue Zhang; Zhi-Hua Xue; Zikangping Wang; Shuwen Chen; Zhi-Jian Yang; Qi-Long Yan

doi:10.1016/j.jhazmat.2020.122842

Hybrid RDX crystals assembled under constraint of 2D materials with largely reduced sensitivity and improved energy density

J Hazard Mater. 2020 Nov 5:398:122842. doi: 10.1016/j.jhazmat.2020.122842. Epub 2020 May 18.

Authors

Xue-Xue Zhang¹, Zhi-Hua Xue¹, Zikangping Wang¹, Shuwen Chen¹, Zhi-Jian Yang², Qi-Long Yan³

Affiliations

¹ Science and Technology on Combustion, Internal Flow and Thermo-structure Laboratory, Northwestern Polytechnical University, Xi'an 710072, China.
² Institute of Chemical Materials, CAEP, Mianyang 621900, China.
³ Science and Technology on Combustion, Internal Flow and Thermo-structure Laboratory, Northwestern Polytechnical University, Xi'an 710072, China. Electronic address: qilongyan@nwpu.edu.cn.

PMID: 32768811
DOI: 10.1016/j.jhazmat.2020.122842

Abstract

In this paper, the widely used energetic material RDX had been modified with 2D high nitrogen polymer (TAGP). Various hybrid RDX crystals (qy-RDX) with higher detonation velocity and better thermostability had been obtained as a result of strong intermolecular interactions between TAGP and RDX molecules. The performance of the qy-RDX had been characterized to clarify the inherent mechanisms. It shows that the⊿H_f of qy-RDX could be largely changed in the range of 23.4 kJ kg^-1 to 1343.6 kJ kg^-1, whereas the density varies only from 1.81 g cm^-3 to 1.86 g cm^-3. The resulted detonation velocities are in the range of 8725.5 m·s^-1 to 9251.8 m·s^-1, depending on the content and state of the TAGP dopant. The sensitivity of the resulted qy-RDX is much better than pristine RDX due to improved crystal quality as well as higher concentration of hydrogen bonds. The impact energy is improved from 8.5 J (RDX) to 22 J (qy-RDX-1), whereas the friction sensitivity improves form 130 N to over 360 N for the same case. The E_a for thermal decomposition of qy-RDX-1has reduced from 147.8 kJ mol^-1 (RDX) to (124.5 kJ mol^-1), since TAGP dopant could be considered as active catalytic sites after melting of RDX.

Keywords: 2D energetic polymer TAGP; Crystal growth with constraint; High density; Insensitive high explosives.