机械球磨法制备纳米TATB及其表征

Characterization of nano TATB fabricated by mechanical milling methodology

采用高能机械球磨法制备出平均粒径为58.1 nm的纳米TATB。利用SEM分析表征了纳米TATB的微观形貌,并统计了纳米TATB的粒度分布。利用XRD、IR和XPS表征了纳米TATB的晶型、分子结构和表面元素等。采用DSC和DSC-IR联用系统对纳米TATB的热分解活化能和热分解产物进行了分析。结果表明,纳米TATB的表观热分解活化能(ES=341.2 k J/mol)相比原料TATB(ES=354.4 k J/mol)降低了13.2 k J/mol,说明纳米TATB的反应活性更高。纳米TATB的主要分解产物为CO_2,同时伴有一定量的N_2O和NO_2生成。热感度实验表明,纳米TATB的5 s爆发点(T5s)高于原料TATB的T5s,说明纳米TATB的热稳定性更高。

TATB nanoparticles with size of 58.1 nm were fabricated upon a high energy milling. Micron morphology of nano- sized TATB was shown in SEM images, and particle sizedistribution of nano TATB was calculated via measuring the specific sizes of -500 nm for the imaged partieles.XRD ,IR, and XPS analyses were employed to investigate the crystal phase, molecular structure, and surface elements of the milled samples.The DSC curves were collected at different heating rates and the activation energy （Es ） of thermolysis of raw and nano TATB were calculated by Starink method.The result indicated that Es of nano TATB was 341.2 kJ/ mol and it was 354.4 kJ/mol for raw TATB, i.e.aetivation energy of TATB decreased by 13.2 kJ/mol after milling. It means that the nano TATB processed is of greater thermal reactivity than the raw TATB.Decomposition products of nano TATB were determined by DSC-IR analysis.One of the main products was CO/, which was companying with minor N2O and NO2.Thermal sensitivity of the raw and nano TATB were studied with 5 s bursting point （ T5s ） tests, and the results showed the T5s of nano TATB was higher than that of raw TATB.This implied that nano TATB was of higher thermal stability than raw TATB.