重结晶对PYX热性能和机械感度的影响  

Influence of Recrystallization on Thermal Properties and Mechanical Sensitivity of PYX

作　　者：罗西 刘红妮[1] 周文静[1] 栾洁玉[1] 赵娟[1] 常海[1] LUO Xi;LIU Hongni;ZHOU Wenjing;LUAN Jieyu;ZHAO Juan;CHANG Hai(Xi’an Modern Chemistry Research Institute,Shaanxi Xi'an,710065)

机构地区：[1]西安近代化学研究所,陕西西安710065

出　　处：《爆破器材》2022年第3期38-42,共5页Explosive Materials

摘　　要：分别采用降温法和溶剂-反溶剂法对2,6-二苦氨基-3,5-二硝基吡啶(PYX)进行了重结晶研究。表征了不同重结晶方法所得PYX晶体的形貌和粒径,测定了重结晶前、后的晶体纯度,研究了重结晶对晶体热性能和机械感度的影响。结果表明:采用降温法在DMSO中得到的多为小颗粒团聚形成的不规则块状PYX晶体;采用溶剂-反溶剂法在DMF或DMSO中得到的多为片状PYX晶体,在DMSO/DMF混合溶剂中得到的多为规则的多边形块状PYX晶体。相比较而言,多边形块状PYX晶体的表面光滑度良好,粒径跨度最小,纯度最高,热稳定性较优,且兼具最低的撞击感度和摩擦感度,其热分解峰温和热爆炸临界温度较重结晶前分别提高了8.99℃和9.11℃,撞击感度和摩擦感度较重结晶前分别降低了16%和12%。2,6-bis(picrylamino)-3,5-dinitropyridine(PYX)was recrystallized by cooling method and solvent-antisolvent method,and morphology and particle size of the crystal obtained by different recrystallization methods were characterized.Crystal purity before and after recrystallization was tested.Effects of recrystallization on thermal property and mechanical sensitivity of the crystal were researched.The results show that the irregular block PYX crystals formed by the agglomeration of small particles were obtained by cooling method in DMSO.The flaky PYX crystals were obtained by solvent-antisolvent method in DMF and DMSO,and the regular polygonal block PYX crystals were obtained in the DMSO/DMF mixed solvent.In comparison,the polygonal block PYX crystals obtained by recrystallization have good surface smoothness,the smallest particle size span,the highest purity,better thermal stability,and the lowest impact sensitivity and friction sensitivity.Compared with those before recrystallization,its thermal decomposition peak temperature and thermal explosion critical temperature increase by 8.99℃and 9.11℃,and impact sensitivity and friction sensitivity decrease by 16%and 12%,respectively.

关 键 词：PYX 晶体形貌 粒径 纯度 热性能 机械感度 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] O64[理学—物理化学]