The influence of temperature and humidity on the decomposition of HMX-HTPB polymer-bonded explosives

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2025-04-09 DOI:10.1016/j.tca.2025.180003

Haoying Liu , Li Hong , Yanchun Li , Aifeng Jiang , Dongming Song

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Abstract

To investigate the thermal stability of HMX-based polymer-bonded explosives (PBX), this study used thermogravimetric analysis/differential scanning calorimetry (TG/DSC) and accelerated aging tests to examine how temperature and humidity affect the decomposition of HMX-HTPB explosives. Results show that HTPB significantly reduces HMX's thermal stability, leading to a two-stage decomposition process. In the first stage, HTPB cracks and causes minor solid-phase decomposition of HMX, lowering the decomposition temperature from 281.52 °C to 271.20 °C. The second stage involves further decomposition of residual HMX after its melting point at 284.09 °C. After 15 days of aging at 71 °C and 90 % relative humidity, the thermal stability markedly deteriorates, with violent decomposition occurring at 266.51 °C. XRD and FTIR analyses revealed that the distortion of the HMX crystal structure, free radicals from HTPB chain scission, and formation of volatile oligomers are the main factors reducing thermal stability.

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温度和湿度对HMX-HTPB聚合物粘结炸药分解的影响

为了研究HMX-HTPB炸药（PBX）的热稳定性，采用热重分析/差示扫描量热法（TG/DSC）和加速老化试验研究了温度和湿度对HMX-HTPB炸药分解的影响。结果表明，HTPB显著降低了HMX的热稳定性，导致了两阶段分解过程。在第一阶段，HTPB发生裂纹，HMX发生少量固相分解，分解温度由281.52℃降至271.20℃。第二阶段涉及残余HMX熔点在284.09°C后的进一步分解。在71℃、90%相对湿度条件下陈化15天后，热稳定性明显恶化，在266.51℃时发生剧烈分解。XRD和FTIR分析表明，HMX晶体结构的畸变、HTPB断链产生的自由基和挥发性低聚物的形成是降低其热稳定性的主要因素。

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来源期刊

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes