纳米LLM-105的物化性能

Study on the Physicochemical Properties of Nano-sized LLM-105

为改善2,6-二氨基-3,5-二硝基吡嗪-1-氧化物(LLM-105)的形貌/尺寸,扩大其在高能钝感配方设计、制备及装药中的实用性,采用机械球磨法批量化制备了粒径在100nm以内的LLM-105颗粒;采用扫描电子显微镜(SEM)和纳米激光粒度仪观测了纳米LLM-105的形貌和粒径分布;采用X射线衍射仪(XRD)和傅里叶变换红外光谱仪(FT-IR)分析了其分子结构和晶型;采用热重-差示量热扫描仪(TG-DSC)研究了其热性能的变化;最后对其撞击感度、摩擦感度和静电火花感度进行了评估。结果表明,纳米LLM-105的平均粒径约为94.7nm,形貌呈类球形;机械球磨法未改变LLM-105的分子结构和晶型;纳米LLM-105热分解峰温较原料粗颗粒提前了13~18℃,表观活化能提高了12.8kJ/mol;撞击感度降低了约66.1%,摩擦感度升高了约6.0%,静电火花感度降低了约4.5%。

In order to improve the morphology and particle size distribution of 2,6-diamino-3,5-dinitropyrazine-1-oxide(LLM-105)particles and expand its applications in high-energy insensitive formulation,nano LLM-105 particles were prepared by a mechanical ball-milling method.The particle size and morphology were characterized by scanning electron microscope(SEM)and laser granulometer.X-ray diffractometer(XRD)and Fourier transform-infrared spectroscopy(FT-IR)were used to analyze the molecular structure and crystal structure.The thermal decomposition properties were investigated by thermogravimetric analysis(TG)and differential scanning calorimetric(DSC)techniques.The impact sensitivity,friction sensitivity and electrostatic spark sensitivity were also evaluated.The results show that the prepared nano-sized LLM-105 is spherical-like shape with an average particle size of 94.7nm.The structures of crystal and molecule have no change compared to that of raw LLM-105.The thermal decomposition peak temperature is lower than that of raw LLM-105,while the Ea is increased by 12.8kJ/mol.The impact sensitivity of nano-sized LLM-105 decreases by 66.1%and fraction sensitivity increases by 6.0%,the electrostatic spark sensitivity decreases by 4.5%compared to those of raw LLM-105.