DAAF基不敏感PBX的热安全性

Thermal Safety of DAAF-Based Insensitive Polymer Bonded Explosives

为了研究3,3′?二氨基?4,4′?氧化偶氮呋咱(DAAF)基不敏感高聚物黏结炸药(PBX)的性能,采用水悬浮包覆技术分别制备出三种DAAF基PBX:DAAF/F2311(95/5)、DAAF/VitonA(95/5)、DAAF/EVA(95/5)。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、差示扫描量热仪(DSC)和机械感度测试仪对样品的形貌结构、热分解特性以及撞击感度、摩擦感度进行测试分析,考察了样品的快速烤燃和慢速烤燃特性。结果表明:DAAF/F2311为表面光滑的类球状、直径约450μm、包覆效果好,而DAAF/EVA和DAAF/VitonA表面粗糙、包覆效果较差;DAAF/F2311比DAAF的放热峰温滞后了0.9℃(升温速率为10℃·min^-1时),DAAF/F2311的活化能比原料DAAF提高了12.14 kJ·mol^-1,热爆炸临界温度提高了8.29℃;按照GJB772A?1997方法测试三者的撞击感度H50均大于100 cm,摩擦感度均为0;快烤和慢烤试验的响应等级均为燃烧,满足不敏感弹药烤燃安全性要求。

In order to study the properties of 3,3′?diamino?4,4′?azoxyfurazan(DAAF)?based insensitive high polymer bonded explosives(PBX),three kinds of DAAF?based PBXs(DAAF/EVA(95/5),DAAF/Viton A(95/5)and DAAF/F2311(95/5))were prepared by water suspension coating technique.The morphology structure,crystal form,thermal decomposition characteristic and mechanical sensitivity were analyzed by scanning electron microscopy(SEM),X?ray diffractometer(XRD),differential scanning calorimeter(DSC),impact and friction sensitivity apparatus.The fast and slow cook?off behaviors were examined.The DAAF/F2311 was well coated which had a smooth spherical shape with 450μm in diameter,while DAAF/EVA and DAAF/VitonA were poorly coated with rough surface.The exothermic peak temperature of DAAF/F2311 was 0.9℃lower than that of DAAF(when the heating rate was 10℃·min^-1).The activation energy and the critical temperature of thermal explosion of DAAF/F2311 was 12.14 kJ·mol^-1 and 8.29℃higher than that of the raw DAAF,respectively.According to the GJB772A-1997 method,the impact sensitivity H50 of the three DAAF?based PBXs were greater than 100 cm,and the friction sensitivity was 0.The response level of the fast and slow cook?off tests was burning,which satisfied the safety requirements for insensitive ammunition.