GAP基热塑性弹性体改性单基发射药的热行为及力学性能

为改善单基发射药的力学性能,制备了聚叠氮缩水甘油醚(GAP)基含能热塑性弹性(GAP-ETPE)不同含量的单孔管状改性单基发射药,通过甲基紫试验和真空安定性试验、差示扫描量热法(DSC)研究了发射药热安定性和热分解过程,并测试了其冲击和压缩性能,分析了GAP-ETPE含量的变化对改性单基发射药热行为和力学性能的影响。结果表明:随着GAP-ETPE含量的增加,改性单基药的热安定性逐渐提高,热分解放热峰温、放热量和密度逐渐降低;低温(-40℃)、常温(20℃)和高温(50℃)下改性单基发射药试样的冲击强度和压缩率提高、抗压强度降低。与空白试样相比,GAP-ETPE含量为30%时,低温、常温和高温下试样的冲击强度分别提高了161.4%、160.1%和164.0%,压缩强度分别降低了23.6%、28.8%和33.1%,压缩率分别提高了246.4%、233.9%和266.0%。

Thermal Behavior and Mechanical Property of GAP-base Energetic Thermoplastic Elastomer Modified Single-base Propellant

In order to improve the mechanical property of single-base propellant,the single perforation cylinder modified singlebase propellant containing glycidyl azide polymer(GAP)-base energetic thermoplastic elastomer were prepared.The thermal stability was evaluated by methyl violet method and vacuum stability test.The thermal decomposition process of the sample was investigated by using differential scanning calorimetry method(DSC).The impact and compression properties of the sample were studied.The results show that when increasing the content of GAP-ETPE,the thermal stability of the modified single-base propellant improve,the exothermic peak temperature,enthalpy of thermal decomposition and density gradually decrease;the impact strength and compression ratio of modified single-base propellant sample under the temperature of-40 ℃,20 ℃ and 50 ℃C all gradually increases,while the compressive strength decreases.Compared with the blank sample,the impact strength of the sample containing 30％ of GAP-ETPE at low temperatures,room temperature and high temperature increases by 161.4％,160.1％ and 164.0％,respectively;compressive strength decreases by 23.6％,28.8％ and 33.1％,respectively;compression ratio increases by 246.4％,233.9％ and 266.0％,respectively.