ETPE发射药与RGD7硝胺发射药燃烧性能及热行为的对比研究

用密闭爆发器实验、差示扫描量热法(DSC)和扫描电子显微镜(SEM)研究了3,3-二叠氮甲基氧丁环/3-叠氮甲基-3-甲基氧丁环(BAMO/AMMO)基含能热塑性弹性体(ETPE)发射药和RGD7硝胺发射药的燃烧性能及热行为。结果表明:与RGD7硝胺发射药相比,ETPE发射药燃烧时间较长,燃速较低,燃速压力指数n大于1,而RGD7硝胺发射药燃速压力指数小于1。对于RGD7硝胺发射药,RDX的熔融吸热峰(204.8℃)不明显,且分解放热峰(240℃)滞后于硝化棉/硝化甘油(NC/NG)(194℃),而ETPE发射药中poly(BAMO/AMMO)分解温度(263℃)高于RDX(240℃)。ETPE发射药和RGD7硝胺发射药的不同燃烧性能归因于发射药中主组分的不同热行为。

Combustion Properties and Thermal Behavior of ETPE gun propellant and RGD7 Nitramine Gun Propellant

The combustion properties and thermal behaviors of energetic thermoplastic elastomer(ETPE) gun propellant and RGD7 nitramine gun propellant were studied by the closed bomb test,differential scanning calorimetry(DSC) and scanning electron microscopy(SEM).The results show that in comparison with RGD7 nitramine gun propellant,the ETPE gun propellant has lower burning rate,longer burning time and the burning rate pressure exponent larger than 1,whereas the pressure exponent of RGD7 nitramine gun propellant is less than 1.For RGD7 nitramine gun propellant,the endothermic melting peak of RDX at 204.8 ℃ in the propellant is inconspicuous and the exothermic decomposition peak of RDX at 240 ℃ is lag behind the exothermic decomposition peak at 194 ℃ of the NC/NG,where as the thermal decomposition temperature at 263 ℃ of poly(BAMO/AMMO) in ETPE gun propellant is higher than the thermal decomposition temperature at 240 ℃ of RDX.The different combustion properties of two gun propellants are caused by the different thermal behaviour of main compounds in the propellants.