Issue 43, 2021

Isothermal decomposition of HMX before and after thermally induced β–δ crystal transformation

Abstract

The β–δ crystal transformation of HMX is examined using a self-made constant temperature decomposition gas measuring device, and the isothermal decomposition kinetic parameters of HMX with different crystal phases are obtained. The pressure–time curves of HMX decomposition at different temperatures are divided into two parts, which have their own decomposition mechanism, thereby indicating that phase transition has a significant effect on HMX decomposition. The results of the model-fitting calculation show that the decomposition of β-HMX within the temperature range of 443–466 K conforms to model no. 6, namely, the Jander equation, and the corresponding activation energy is 114.15 kJ mol−1, with ln(A/s−1) = 7.89. The decomposition of δ-HMX within the temperature range of 469–483 K conforms to model no. 26, namely, the Mampel power rule, and the corresponding activation energy is 87.99 kJ mol−1, with ln(A/s−1) = 6.08. The results indicate that the storage life of HMX is 528.23 years at room temperature (298 K) when the reaction depth reaches 0.1%.

Graphical abstract: Isothermal decomposition of HMX before and after thermally induced β–δ crystal transformation

Article information

Article type
Paper
Submitted
30 Jūl. 2021
Accepted
02 Okt. 2021
First published
28 Okt. 2021

CrystEngComm, 2021,23, 7698-7705

Isothermal decomposition of HMX before and after thermally induced β–δ crystal transformation

H. Peng, J. Guan, Q. Yan, X. Fu, B. Jin and R. Peng, CrystEngComm, 2021, 23, 7698 DOI: 10.1039/D1CE00998B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements