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Issue 16, 2019, Issue in Progress
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Preparation and characteristics of a novel PETN/TKX-50 co-crystal by a solvent/non-solvent method

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Abstract

In order to decrease the sensitivity and broaden the application of pentaerythritol tetranitrate (PETN), a novel energetic co-crystal composed of PETN and dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate (TKX-50) with high energy and low sensitivity was successfully prepared through the solvent/non-solvent method. The morphology and structure of the as-prepared co-crystal were characterized by scanning electron microscopy (SEM), X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectrometry (XPS), fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy and high performance liquid chromatography (HPLC). The thermal decomposition properties were also analyzed by simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC). The safety performance was judged by mechanical sensitivity tests. The SEM results revealed that the prepared new material was homogeneous with a mean granularity of 1 μm and the morphology was distinct from raw PETN and TKX-50. The XRD analysis indicated that a new crystalline formation appeared in the co-crystal which was quite different from the raw materials and their mixture. The XPS analysis showed peak shifts of C, N, O elements in the co-crystal. The FTIR spectra and Raman spectra suggested that hydrogen bond interactions existed between PETN and TKX-50 molecules. The molar ratio of PETN and TKX-50 was 1 : 1 determined by HPLC. There were two thermal decomposition peaks (194.1 °C and 261.3 °C) for the co-crystal at 20 °C min−1, while the raw materials and mixture had only one. Besides, the activation energy of the co-crystal increased compared to the raw materials, indicating better thermal stability of the co-crystal. The impact sensitivity and friction sensitivity of the PETN/TKX-50 co-crystal were reduced compared to raw PETN, and were even better than for 1,3,5-trimethylene trinitramine (RDX). The results showed a prospective application of the prepared PETN/TKX-50 co-crystal in the future.

Graphical abstract: Preparation and characteristics of a novel PETN/TKX-50 co-crystal by a solvent/non-solvent method

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Article information


Submitted
23 Dec 2018
Accepted
07 Mar 2019
First published
21 Mar 2019

This article is Open Access

RSC Adv., 2019,9, 9204-9210
Article type
Paper

Preparation and characteristics of a novel PETN/TKX-50 co-crystal by a solvent/non-solvent method

L. Xiao, S. Guo, H. Su, B. Gou, Q. Liu, G. Hao, Y. Hu, X. Wang and W. Jiang, RSC Adv., 2019, 9, 9204
DOI: 10.1039/C8RA10512J

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    [Original citation] - Published by The Royal Society of Chemistry.

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