为了提高GAP微烟推进剂的力学性能,通过在GAP微烟推进剂中引入适量的PBT黏合剂进行复配,研究了增塑剂种类、增塑剂与黏合剂质量比(增塑比)、扩链剂种类及其官能度、扩链剂含量、固化剂种类以及固化参数对推进剂宽温域(-55℃～+70℃)力学性能的影响。结果表明,添加Bu-NENA增塑剂,可极大地改善推进剂的低温力学性能以及降低推进剂的玻璃化转变温度Tg,并在此基础上通过调节增塑剂与黏合剂增塑比为2.0,叠氮黏合剂/三官能度PET质量比为5:1; 采用TDI为固化剂以及固化参数Rt为1.2时,可使推进剂的Tg不大于-60℃以及在-55℃～+70℃范围内具有良好的力学性能,即在+70℃时抗拉强度大于0.50MPa,-55℃～+70℃时最大伸长率大于45%。
Abstract
In order to improve the mechanical properties of GAP low smoke propellant, the influencing factors including the type of plasticizer, the ratio of plasticizer and binder, the types of chain extender and functionality, the content of chain extender, the curing agent and curing parameters on the mechanical properties at a broad temperature range(-55℃—+70℃)of propellant were studied through adding moderate mass fraction of PBT binder in the GAP low smoke propellant. The results indicate that addition of Bu-NENA plasticizer can improve the mechanical properties of propellant at low temperature and lower the glass transition temperature of propellant. Based on this, the ratio of plasticizer and binder is 2.0, the ratio of azide binder and tri-functional PET binder is 5:1, TDI as the curing agent and the curing parameter is 1.2, the glass transition temperature of propellant is reduced lower than -60℃, and the propellant shows a good mechanical property between -55℃ and 70℃. The tensile strength at 70℃ is higher than 0.5MPa, and the maximum elongation is higher than 45%.
关键词
物理化学 /
叠氮微烟推进剂 /
玻璃化温度 /
力学性能 /
GAP
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Key words
physical chemistry /
azide low smoke propellant /
glass transition temperature /
mechanical property /
GAP
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