温湿双因素加载下超细LLM-105固相熟化行为  

Effects of Temperature and Humidity on Solid-phase Ripening Behavior of Utrafine LLM-105

作　　者：段凤仪 贺山山 张浩斌[1] 黄石亮[1] 徐金江[1] 齐天骄[1] 李诗纯[1] 刘渝[1] DUAN Feng-yi;HE Shan-shan;ZHANG Hao-bin;HUANG Shi-liang;XU Jin-jiang;QI Tian-jiao;LI Shi-chun;LIU Yu(Institute of Chemical Materials,CAEP,Mianyang 621999,China)

机构地区：[1]中国工程物理研究院化工材料研究所,四川绵阳621999

出　　处：《含能材料》2023年第10期994-1003,共10页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金(21975235,22375191)。

摘　　要：超细2,6-二氨基-3,5-二硝基吡嗪-1-氧化物(LLM-105)具有安全性好、冲击起爆阈值低等特点,在起爆传爆序列方面具有广阔应用前景。固相熟化是超细LLM-105贮存使役过程中的主要老化行为,会导致粒径长大、性能劣化。温度、湿度是影响固相熟化的重要环境因素,但影响机制尚不清晰。为此,研究采用原位小角X射线散射(SAXS)、扫描电子显微镜(SEM)和原位原子力显微镜(AFM)等方法,捕捉不同温湿度环境下超细LLM-105颗粒结构演化行为,分析其固相熟化机制。结果表明:超细LLM-105在120℃下老化30 d后发生了明显的固相熟化,比表面积(SSA)下降了41.6%,熟化机制以奥斯特瓦尔德熟化(Ostwald Ripening,OR)为主导,伴随斯莫鲁霍夫斯基熟化(Smoluchowski Ripening,SR)。湿度通过促进OR显著加速超细LLM-105固相熟化,在60℃、90%相对湿度下老化30 d,SSA下降35.8%。Ultrafine 2,6-diamino-3,5-dinitropyrazine-1-oxide(LLM-105)possesses high safety performance and low impact initiation threshold,showing promising applications in the initiation sequence.Solid-phase ripening is the main aging behavior of ultrafine LLM-105 during the storage process,which leads to the growth of particle size and performance degradation.Temperature and humidity are important environmental factors that affect solid-phase ripening,but the microscopic mechanism is still unclear.In situ small angle X-ray scattering(SAXS),Scanning electron microscope(SEM)and in situ Atomic force microscopy(AFM)were used to capture the structural evolution of ultrafine LLM-105 particles under different temperature and humidity environments,and the solid-phase ripening mechanism was analyzed.Ultrafine LLM-105 had obvious solid-phase ripening after 30 days at 120℃,and its specific surface area(SSA)decreased by 41.6%.The ripening mechanism was dominated by Ostwald Ripening(OR),accompanied with Smoluchowski Ripening(SR).Humidity significantly accelerates the solid-phase ripening of ultrafine LLM-105 by promoting OR.After 30 days at 60℃ and 90%relative humidity,SSA decreased by 35.8%.

关 键 词：超细LLM-105 固相熟化 动力学 温度 湿度 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术]