Sovizi M R, Hajimirsadeghi S S, Naderizadeh B
Faculty of Material and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran.
J Hazard Mater. 2009 Sep 15;168(2-3):1134-9. doi: 10.1016/j.jhazmat.2009.02.146. Epub 2009 Mar 13.
Data on the thermal stability of energetic materials such as nitrocellulose were required in order to obtain safety information for handling, storage and usage. In present study, the thermal stability of micron and nano-sized nitrocellulose samples was determined by differential scanning calorimetry (DSC) and simultaneous thermogravimetry-differential thermal analysis (TG/DTA) techniques. The results of TG analysis revealed that the main thermal degradation of nitrocellulose occurs in the temperature range of 190-210 degrees C. On the other hand, the TG-DTA analysis of samples indicated that particle size of nitrocellulose could affect on its thermal stability and its decomposition temperature decreases by decreasing its particle size. The influence of the heating rate (5, 10, 15 and 20 degrees C/min) on the DSC behaviour of the nitrocellulose with two particle sizes was verified. The results showed that, as the heating rate was increased, decomposition temperature of the micron and nano-sized compound was increased. Also, the kinetic parameters such as activation energy and frequency factor for the micron and nano-sized nitrocellulose were obtained from the DSC data by non-isothermal methods proposed by ASTM E696 and Ozawa.
为了获取硝化纤维素等含能材料在处理、储存和使用方面的安全信息，需要有关其热稳定性的数据。在本研究中，通过差示扫描量热法（DSC）和同步热重-差示热分析（TG/DTA）技术测定了微米级和纳米级硝化纤维素样品的热稳定性。热重分析结果表明，硝化纤维素的主要热降解发生在190-210℃的温度范围内。另一方面，样品的TG-DTA分析表明，硝化纤维素的粒径会影响其热稳定性，且随着粒径减小，其分解温度降低。验证了加热速率（5、10、15和20℃/min）对两种粒径硝化纤维素DSC行为的影响。结果表明，随着加热速率的增加，微米级和纳米级化合物的分解温度升高。此外，通过ASTM E696和小泽提出的非等温方法，从DSC数据中获得了微米级和纳米级硝化纤维素的动力学参数，如活化能和频率因子。
