摘要
制备了含3,6-双(1-氢-1,2,3,4-四唑-5-氨基)-1,2,4,5-四嗪(BTATz)铅复合物(LCBTATz)的双基(DB)推进剂和黑索今(RDX)-改性双基(CMDB)推进剂.采用热重-微商热重法(TG-DTG)及差示扫描量热法(DSC)研究了其热分解行为和非等温分解动力学,并在此基础上评价了其热安全性.结果表明,LCBTATz-DB复合物中在350-540 K之间只存在一个放热分解峰,LCBTATz-CMDB复合物中存在两个连续的放热分解峰,在390-540K温度范围内,其机理方程分别为:f(α)=α^(-1)/2和f(α)=2(1-α)^(3/2).计算了热加速分解温度(T_(SADT))、热爆炸临界温度(T_b)、热点火温度(T_(TIT))和绝热至爆炸时间(t_(Tlad)),其值分别为:DB001复合物,T_(SADT)=444.50 K,T_(TITT)=453.96 K,T_b=471.84 K;t_(Tlad)=39.36 s;CMDB100复合物,T_(SADT)=442.38 K,T_(TITT)=452.89 K,T_b=464.13 K,t_(Tlad)=21.3 s,并以此来评价化合物的热安全性.考察了LCBTATz-DB以及LCBTATz-CMDB的燃烧性能,结果表明LCBTATz是一种高效的双基燃烧催化剂,在较大的压力范围内可以显著提高燃速并且大幅度降低压力指数.对于双基推进剂在2-8 MPa压力范围内出现了明显的超燃速现象,8-12 MPa出现了"麦撒"效应,对于改性双基推进剂的压力指数降到0.18.
The composite double base （DB）/hexogen （RDX）-modified double base （CMDB） propellants （Nos. DB001 and CMDB100） were prepared with the lead complex of 3,6-bis（1H-1,2,3,4-tetrazol-5-yl- amino）-1,2,4,5-tetrazine （LCBTATz）, with and without the ballistic modifier. Their thermal behaviors and non- isothermal decomposition reaction kinetics were investigated by therrnogravimetry, derivative thermogravimetry （TG-DTG）, and differential scanning calorimetry （DSC）. For the LCBTATz-DB propellant, there was onemass loss stage in the TG curve and one exothermic peak in the DSC curve over the temperature range 350-540 K. For LCBTATz-CMDB, there were two continuous exothermic stages in the TG curve, and only one corresponding exothermic peak in the DSC curve over the range 390-540 K. The exothermal decomposition reaction mechanisms of LCBTATz-DB and LCBTATz-CMDB follow the functions f（α）=α-1/2 and f（α）=2（1-α）3/2, respectively （α： conversion degree）. The self-accelerating decomposition temperatures （TSADT）, thermal ignition temperatures （T_TITT）, critical temperatures of thermal explosion （Tb）, adiabatic times- to-explosion （t_Tlad）, and thermodynamic parameters of activation reaction were calculated, and the thermal safety was evaluated. For DB001, T_SADT=444.50 K, T_TITT=453.96 K, Tb=471.84 K, and t_Tlad=39.36 s. For CMDB100, TSAOT=442.38 K, T_TITT=452.89 K, Tb=464.13 K, and t_Tlad=21.3 s. As a high-efficiency combustion catalyst, LCBTATz in double-base propellants increases the propulsion rate and reduces the pressure index for larger scale pressures. This makes the DB propellant appear to have a significant super burning effect at 2-8 MPa and a ＂mesa effect＂ at 8-12 MPa. Meanwhile, the pressure exponent of the CMDB propellant decreased to 0.18.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2013年第10期2087-2094,共8页
Acta Physico-Chimica Sinica
基金
the National Natural Science Foundation of China(21101127,21073141)
National Defense Pre-Research Foundation of China(9140A28020111BQ3401)
National Defense Pre-Research Foundation of China(A3120110005)~~
